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  • Location: Maine 
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    IDEXX LABORATORIES, INC. 2020 Annual Report


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    UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-K (Mark One) ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2020 ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from _______________ to _______________. COMMISSION FILE NUMBER: 0-19271 IDEXX LABORATORIES, INC. (Exact name of registrant as specified in its charter) Delaware 01-0393723 (State or other jurisdiction of incorporation or organization) (IRS Employer Identification No.) One IDEXX Drive Westbrook, Maine 04092 (Address of principal executive offices) (ZIP Code) 207-556-0300 (Registrant’s telephone number, including area code) Securities registered pursuant to Section 12(b) of the Act: Title of each class Trading Symbol(s) Name of each exchange on which registered Common Stock, $0.10 par value per share IDXX NASDAQ Global Select Market Securities registered pursuant to Section 12(g) of the Act: None Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. Yes ☒ No ☐ Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act. Yes ☐ No ☒ Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes ☒ No ☐ Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files). Yes ☒ No ☐ Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and "emerging growth company" in Rule 12b-2 of the Exchange Act. Large accelerated filer ☒ Accelerated filer ☐ Non-accelerated filer ☐ Smaller reporting company ☐ Emerging growth company ☐ If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐ Indicate by check mark whether the registrant has filed a report on and attestation to its management’s assessment of the effectiveness of its internal control over financial reporting under Section 404(b) of the Sarbanes-Oxley Act (15 U.S.C. 7262(b)) by the registered public accounting firm that prepared or issued its audit report. ☒ Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act). Yes ☐ No ☒ Based on the closing sale price on June 30, 2020 of the registrant’s Common Stock, the last business day of the registrant’s most recently completed second fiscal quarter, as reported by the NASDAQ Global Select Market, the aggregate market value of the voting stock held by non-affiliates of the registrant was $27,735,989,165. For these purposes, the registrant considers its directors and executive officers to be its only affiliates. The number of shares outstanding of the registrant’s Common Stock was 85,426,080 on February 9, 2021. DOCUMENTS INCORPORATED BY REFERENCE Part III—Specifically identified portions of the Company’s definitive Proxy Statement to be filed in connection with the Company’s 2021 annual meeting of stockholders (the “2021 Annual Meeting”), to be held on May 12, 2021, are incorporated herein by reference.


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    GLOSSARY OF TERMS AND SELECTED ABBREVIATIONS Term/Abbreviation Definition AOCI Accumulated other comprehensive income or loss ASC Accounting Standards Codification ASU 2016-13 ASU 2016-13, “Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments CAG Companion Animal Group, a reporting segment that provides veterinarians diagnostic products and services and information management solutions that enhance the health and well-being of pets. cGMP The FDA’s current Good Manufacturing Practice regulations. Clinical visits The reason for the visit involves an interaction between a clinician and a pet, including wellness and non- wellness visit types. Credit Facility Our $1 billion three-year unsecured revolving credit facility under an amended and restated credit agreement that was executed in April 2020, also referred to as line of credit. EMA Extended maintenance agreements EPA U.S. Environmental Protection Agency EPS Earnings per share, if not specifically stated, EPS refers to earnings per share on a diluted basis. EU European Union EURIBOR Interest rate used in lending between banks on the European Union interbank market and also used as a reference for setting the interest rate on other loans. FASB U.S. Financial Accounting Standards Board FDA U.S. Food and Drug Administration Our customer instrument rebate programs, previously referred to as IDEXX Instrument Marketing Instrument rebate programs Programs, which require an instrument purchase and provide customers the opportunity to earn future rebates based on the volume of products and services they purchase over the term of the program. IVLS IDEXX VetLab Station, connects and integrates the diagnostic information from all the IDEXX VetLab analyzers and thus provides reference laboratory information management system capability. Kits and consumables Rapid assay kits and IDEXX VetLab consumables LIBOR London Interbank Offered Rate, current benchmark interest rate used between banks and used to set interest rates on loans. LPD Livestock, Poultry and Dairy, a reporting segment that provides diagnostic products and services for livestock and poultry health and ensures the quality and safety of milk and improves producer efficiency. Non-wellness visits Patient visits where the reason for the visit is sickness, procedure, or monitoring. OCI Other comprehensive income or loss OPTI Medical Systems, Inc., a wholly-owned subsidiary of IDEXX Laboratories Inc., located in Roswell, Georgia. This business provides point-of-care and laboratory diagnostics (including electrolyte and blood OPTI Medical gas analyzers and related consumable products) for the human medical diagnostics market, as well as COVID-19 testing products and services. The Roswell facility also manufactures electrolytes slides (instrument consumables) to run Catalyst One®, Catalyst Dx®, and blood gas analyzers and consumables for the veterinary market; also referred to as OPTI. A non-GAAP financial measure that represents the percentage change in revenue, as compared to the same period for the prior year, net of the effect of changes in foreign currency exchange rates, certain business Organic revenue growth acquisitions and divestitures. Organic revenue growth should be considered in addition to, and not as a replacement for or as a superior measure to, revenues reported in accordance with U.S. GAAP, and may not be comparable to similarly titled measures reported by other companies. Ortho Ortho Clinical Diagnostics, Inc., a supplier of dry slide consumables used in our Catalyst One and Catalyst Dx Chemistry Analyzers and VetTest Chemistry Analyzer. Prime rate The prime rate is an interest rate determined by individual banks. It is often used as a reference rate for many types of loans. Up-Front customer loyalty Our up-front loyalty programs provide customers with incentives in the form of cash payments or IDEXX programs Points upon entering into multi-year agreements to purchase annual minimum amounts of future products or services. PACS Picture archiving and communication software, our software solution for accessing, storing, and sharing diagnostic images. R&D Research and Development Reagent rentals Instruments being placed at customer sites at little or no cost in exchange for a long-term customer commitment to purchase instrument consumables. 2


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    Reported revenue growth The percentage change in revenue reported in accordance with U.S. GAAP, as compared to the same period in the prior year. S&P Standard & Poor’s S&P 500 Health Care Index The index for the S&P 500 Health Care (U.S. companies) measures the performance of companies that are classified as members in the Global Industry Classification Standard of health care services sub-industry. S&P 500 Index The S&P 500 Index is a U.S. stock market index based on the market capitalization of 500 large companies having common stock listed on the New York Stock Exchange or NASDAQ, including IDEXX. SaaS Software-as-a-service SDMA Symmetrical dimethyl arginine, a biomarker that detects kidney disease. SEC U.S. Securities and Exchange Commission Senior Note Agreements Note purchase agreements for the private placement of senior notes, referred to as senior notes or long-term debt. T4 Thyroxine, a hormone produced by the thyroid gland, tested to indicate thyroid health. U.S. GAAP Accounting principles generally accepted in the United States of America USDA United States Department of Agriculture Programs that provide customers with a free or discounted instrument or system upon entering into multi- Volume commitment programs year agreements to purchase annual minimum amounts of products and services, such as our IDEXX 360 program. Water Water, a reporting segment that provides water microbiology testing products. Wellness visits Patient visits where the reason for the visit is an annual exam, vaccination, or routine check-up. 3


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    IDEXX LABORATORIES, INC. Annual Report on Form 10-K Table of Contents Item No. Page No. 𝅺 𝅺 PART I Item 1 Business 6 Item 1A Risk Factors 17 Item 1B Unresolved Staff Comments 30 Item 2 Properties 30 Item 3 Legal Proceedings 30 Item 4 Mine Safety Disclosures 30 𝅺 𝅺 PART II Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity 31 Item 5 Securities Item 6 Selected Financial Data 32 Item 7 Management’s Discussion and Analysis of Financial Condition and Results of Operations 33 Item 7A Quantitative and Qualitative Disclosures about Market Risk 59 Item 8 Financial Statements and Supplementary Data 61 Item 9 Changes in and Disagreements with Accountants on Accounting and Financial Disclosure 61 Item 9A Controls and Procedures 61 Item 9B Other Information 62 𝅺 𝅺 PART III Item 10 Directors, Executive Officers and Corporate Governance 63 Item 11 Executive Compensation 63 Item 12 Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters 63 Item 13 Certain Relationships and Related Transactions, and Director Independence 63 Item 14 Principal Accountant Fees and Services 63 𝅺 𝅺 PART IV Item 15 Exhibits, Financial Statement Schedules 64 Item 16 Form 10-K Summary 64 𝅺 Financial Statements and Supplementary Data – Index to Consolidated Financial Statements F-1 𝅺 Exhibit Index Signatures 4


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    The terms “IDEXX,” “Company,” “registrant,” “we,” “us,” and “our” included in this Annual Report on Form 10-K mean IDEXX Laboratories, Inc. and all subsidiaries that are consolidated under U.S. GAAP. We have included certain terms and abbreviations used throughout this Annual Report on Form 10-K in the "Glossary of Terms and Selected Abbreviations.” Our name, logo and the following terms used in this Annual Report on Form 10-K are either registered trademarks or trademarks of IDEXX Laboratories, Inc. in the United States and/or other countries: 4Dx®, Animana® Veterinary Software, Catalyst Dx®, Catalyst One®, Coag Dx™, Colilert®, Colisure®, Cornerstone®, DVMAX®, Enterolert®, Feline Triple®, Filta- Max®, Filta-Max xpress®, IDEXX I-Vision CR®, IDEXX I-Vision DR®, IDEXX I-Vision Mobile™, IDEXX ImageBank™ , IDEXX Neo®, IDEXX-PACS™, IDEXX SDMA®, IDEXX VetLab®, LaserCyte®, LaserCyte® Dx, OPTI®, Pet Health Network®, Petly® Plans, Practice Profile™, ProCyte Dx®, Pseudalert®, Quanti-Tray®, rVetLink®, SediVue Dx®, SNAP®, SNAPduo®, SNAP Pro®, SNAP® cPL™, SNAP® fPL™, SNAPshot Dx®, IDEXX VetAutoread™, VetConnect®, IDEXX VetLab® UA™, VetLINK®, VetLyte®, VetStat®, and VetTest®. VetAutoread is a trademark of QBC Diagnostics. CAUTIONARY STATEMENT REGARDING FORWARD-LOOKING INFORMATION This Annual Report on Form 10-K for the year ended December 31, 2020, contains statements which, to the extent they are not statements of historical fact, constitute “forward-looking statements.” Such forward-looking statements about our business and expectations within the meaning of the Private Securities Litigation Reform Act of 1995, Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), include statements relating to the impact of the COVID-19 pandemic; future revenue growth rates; future tax benefits; the impact of tax legislation and regulatory action; business trends, earnings and other measures of financial performance; the effect of economic downturns on our business performance; the projected effect of patent and license expirations; the projected impact of foreign currency exchange rates and hedging activities; demand for our products; realizability of assets; future cash flow and uses of cash; future repurchases of common stock; future levels of indebtedness and capital spending; interest expense; warranty expense; share-based compensation expense; the adoption and projected impact of new accounting standards; future commercial efforts; future product launches; projected cost and completion of capital investments; and competition. Forward-looking statements can be identified by the use of words such as “expects,” “may,” “anticipates,” “intends,” “would,” “will,” “plans,” “believes,” “estimates,” “should,” “project,” and similar words and expressions. These forward-looking statements are intended to provide our current expectations or forecasts of future events, are based on current estimates, projections, beliefs, and assumptions, and are not guarantees of future performance. Actual events or results may differ materially from those described in the forward-looking statements. These forward-looking statements involve a number of risks and uncertainties, including, among other things, the matters described under the headings "Business," "Risk Factors," "Legal Proceedings," "Management's Discussion and Analysis of Financial Condition and Results of Operations," and "Quantitative and Qualitative Disclosures About Market Risk" in this Annual Report on Form 10-K. Any forward-looking statements represent our estimates only as of the day this Annual Report on Form 10-K was first filed with the Securities and Exchange Commission (“SEC”) and should not be relied upon as representing our estimates as of any subsequent date. From time to time, oral or written forward-looking statements may also be included in other materials released to the public and they are subject to the risks and uncertainties described or cross-referenced in this section. While we may elect to update forward- looking statements at some point in the future, we specifically disclaim any obligation to do so, even if our estimates or expectations change. 5


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    PART I ITEM 1. BUSINESS COMPANY OVERVIEW IDEXX was incorporated in Delaware in 1983. We develop, manufacture, and distribute products and provide services primarily for the companion animal veterinary, livestock and poultry, dairy and water testing markets. We also provide point- of-care and laboratory diagnostics for the human medical diagnostic market. Our primary products and services are: • Point-of-care veterinary diagnostic products, comprised of instruments, consumables, and rapid assay test kits; • Veterinary reference laboratory diagnostic and consulting services; • Practice management, and diagnostic imaging systems and services used by veterinarians; • Health monitoring, biological materials testing, laboratory diagnostic instruments, and services used by the biomedical research community; • Diagnostic, health-monitoring products for livestock, poultry, and dairy; • Products that test water for certain microbiological contaminants; and • Point-of-care electrolytes and blood gas analyzers and SARS-CoV-2 RT-PCR (COVID-19 test) used in the human diagnostics market. Our Purpose is to be a great company that creates exceptional long-term value for our customers, employees, and stockholders by enhancing the health and well-being of pets, people, and livestock. DESCRIPTION OF BUSINESS BY SEGMENT We operate primarily through three business segments: Companion Animal Group, Water quality products, and Livestock, Poultry and Dairy. Our Other operating segment combines and presents our products and services for the human medical diagnostics market with our out-licensing arrangements because they do not meet the quantitative or qualitative thresholds for reportable segments. Companion Animal Group (“CAG”) - Diagnostic and information management-based products and services for the veterinary market, including in-clinic diagnostic solutions, outside reference laboratory services, and veterinary software and services. CAG Diagnostics We provide diagnostic capabilities that meet veterinarians’ diverse needs through a variety of modalities, including in- clinic diagnostic solutions and outside reference laboratory services. Regardless of modality utilized, veterinarians are provided with clinically relevant data which is integrated within our information management technologies. The result is a comprehensive view of patient diagnostic information that is easily accessible by both the veterinarian and pet owner. Integrated Diagnostic Information Management. VetConnect PLUS is a cloud-based technology that enables veterinarians to access and analyze patients’ data from all of IDEXX’s diagnostic modalities. These integrated diagnostic results provide the veterinarian with a visualization of patient-specific testing results, allowing the veterinarian to easily see and trend diagnostic results, enabling greater medical insight and enhanced decision-making. In addition, VetConnect PLUS provides instant mobile or browser-based access to results, which can be printed or emailed to pet owners and other veterinarians. In-Clinic Diagnostic Solutions. Our in-clinic diagnostic solutions are comprised of our IDEXX VetLab suite of in- clinic chemistry, hematology, immunoassay, urinalysis, and coagulation analyzers, as well as associated proprietary consumable products that provide real-time reference lab quality diagnostic results. Our in-clinic diagnostic solutions also include a broad range of single-use, IDEXX SNAP rapid assay test kits that provide quick, accurate, and convenient point-of- care diagnostic test results for a variety of companion animal diseases and health conditions. Additionally, we offer extended maintenance agreements in connection with the sale of our instruments. 6


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    Blood and Urine Chemistry. We have three blood and urine chemistry analyzers that are used by veterinarians to measure levels of certain enzymes and other substances in blood or urine for monitoring health status and assisting in diagnosing physiologic conditions. We currently sell two of these chemistry analyzers, the Catalyst One Chemistry analyzer and the VetTest Chemistry analyzer. We continue to support our Catalyst Dx Chemistry analyzer, previously sold as part of the Catalyst platform. We also have two other chemistry analyzers, the VetLyte Electrolyte analyzer and the VetStat Electrolyte and Blood Gas analyzer. Sales of consumables to customers who use our chemistry analyzers provide the majority of our instrument consumables revenues from our installed base of IDEXX VetLab instruments. Hematology. We sell five hematology analyzers that assess the cellular components of blood, including red blood cells, white blood cells, and platelets (also called a complete blood count). These analyzers include the ProCyte Dx hematology analyzer, the LaserCyte Dx hematology analyzer; and the IDEXX VetAutoread hematology analyzer. We also sell the Coag Dx analyzer, which permits the detection and diagnosis of blood clotting disorders. During 2020, we introduced and began selling our new ProCyte One analyzer and will begin delivery of these analyzers in 2021. Rapid Assay. The SNAP rapid assays are single-use, handheld test kits that can work without the use of instrumentation, although many kits may also be activated with results automatically captured and interpreted by the SNAP Pro Analyzer. This device improves medical care by allowing veterinarians to share the test results with the pet owner on the SNAP Pro Analyzer screen, or via VetConnect PLUS. Our SNAPshot Dx analyzer can run multiple patient samples at once. The principal canine SNAP rapid assay tests include SNAP 4Dx Plus, which tests for the six vector-borne diseases including Lyme disease as well as canine heartworm and SNAP Heartworm RT, which tests for heartworm. Sales of our canine vector-borne disease tests are greater in the first half of our fiscal year due to seasonality of disease testing in the veterinary practices in the Northern Hemisphere. The principal feline SNAP rapid assay tests include SNAP Feline Triple, which tests for feline immunodeficiency virus (“FIV”) (which is similar to the virus that leads to AIDS in humans) and SNAP FIV/FeLV Combo Test, which tests for FIV and Feline leukemia virus ("FeLV"). Urinalysis. The SediVue Dx analyzer is designed to provide automated real-time results in a fraction of the time of manual microscope analysis, which allows veterinary staff to perform a urine sediment analysis in approximately 3 minutes. The IDEXX VetLab UA analyzer provides rapid, automated capture of semi-quantitative chemical urinalysis from IDEXX UA strips and is validated specifically for veterinary use. IDEXX VetLab Station. The IDEXX VetLab Station (“IVLS”) connects and integrates the diagnostic information from all the IDEXX VetLab analyzers, and thus, provides reference laboratory information management system capability. IVLS also sends all results created on connected instruments instantly to VetConnect PLUS. We sell IVLS as an integral component of the Catalyst One, Catalyst Dx, LaserCyte, LaserCyte Dx and ProCyte Dx analyzers, SNAP Pro Analyzer, SNAPshot Dx analyzer and also as a standalone hardware platform. Outside Reference Laboratory Diagnostic and Consulting Services. We offer commercial reference laboratory diagnostic and consulting services to veterinarians in many developed markets worldwide, including customers in the U.S., Europe, Canada, Australia, Japan, New Zealand, South Africa, South Korea, and Brazil, through a network of over 80 laboratories. Customers use our services by submitting samples by courier or overnight delivery to one of our facilities. Most test results have same-day or next-day turnaround times. Our diagnostic laboratory business also provides health monitoring and diagnostic testing services to biomedical research customers in North America, Europe, and Asia. Our reference laboratories offer a large selection of tests and diagnostic panels to detect a number of disease states and other conditions in animals, including all tests that can be run in-clinic at the veterinary practice with our instruments or rapid assays. This menu of tests also includes a number of specialized and proprietary tests that we have developed that allow practitioners to diagnose increasingly relevant diseases and conditions in dogs and cats, including parasites, heart disease, allergies, pancreatitis, diabetes, and infectious diseases. Additionally, we provide specialized veterinary consultation, telemedicine, and advisory services, including radiology, cardiology, internal medicine, and ultrasound consulting. These services enable veterinarians to obtain readings and interpretations of test results transmitted by telephone and over the Internet. 7


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    Veterinary Software and Services & Diagnostic Imaging Systems Veterinary Software and Services. We develop, market, and sell a portfolio of software and services for independent veterinary clinics and corporate groups. This portfolio includes: Practice management systems. Software, hardware, and integrated services that run key functions of veterinary clinics, including managing patient electronic health records, scheduling, client communication, billing, and inventory management. Our principal practice management systems are Cornerstone (on-premise), IDEXX Neo (cloud-based), DVMAX (on-premise), and IDEXX Animana (cloud-based, available in Europe). To support the software system needs of practices, IDEXX provides integrated services including: Hardware, Payment Solutions, Data Backup & Recovery, and Practice Supplies. Software applications that extend workflow capabilities for practices and groups. We are able to improve overall patient management and workflow optimization through coordination and tracking of every step of a patient during a hospital stay. Our SmartFlow cloud offering works in conjunction with major veterinary practice management systems, including IDEXX Cornerstone, DVMAX, IDEXX Animana, IDEXX Neo, and certain third-party practice management systems. Client marketing and wellness plan management. In addition, we offer cloud-based client communication (Pet Health Network Pro and Pet Health Network 3D) and preventive care plan management software (Petly Plans) designed to strengthen the relationship between the veterinarian and the pet owner. To support the communication needs between general practices and specialty referral practices, IDEXX offers rVetLink software. Lastly, IDEXX Enterprise provides centralized management and reporting capabilities for groups of veterinary practices. Diagnostic Imaging Systems. Our diagnostic imaging systems capture radiographic images in digital form, replacing traditional x-ray film and the film development process, which generally requires the use of hazardous chemicals and darkrooms. We market and sell four diagnostic imaging systems primarily used in small animal veterinary applications: the IDEXX ImageVue DR50, the IDEXX ImageVue DR40, the IDEXX ImageVue DR30, and the IDEXX ImageVue CR20. Our diagnostic imaging systems employ picture archiving and communication system (“PACS”) software called IDEXX-PACS, which facilitates radiographic image capture and review. IDEXX Web PACS is our cloud-based software-as-a- service (“SaaS”) offering for viewing, accessing, storing, and sharing multi-modality diagnostic images. IDEXX Web PACS is integrated with Cornerstone, IDEXX Neo, IDEXX DVMAX, and IDEXX VetConnect PLUS to provide centralized access to diagnostic imaging results alongside patient diagnostic results from any internet connected device. IDEXX I-Vision Mobile is a software application that allows veterinarians with IDEXX digital radiography systems the ability to request, view and send images using an iPad® mobile tablet. This application integrates with our IDEXX-PACS software. We believe that the breadth of our full diagnostic solution, including novel products and services developed and made available only by IDEXX, as well as the seamless software integration of our offering provide a unique competitive advantage by giving veterinarians the tools and services to offer advanced veterinary medical care. We believe that with the use of our products and services, veterinary practices significantly improve the quality of veterinary care provided to their patients, increase staff efficiencies, and effectively communicate the value of this medical care to the pet owner. We believe that these capabilities, enabled by the use of IDEXX products and services, improve the financial health of the veterinary practice. 8


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    Water quality products (“Water”) - Water provides innovative testing solutions for easy, rapid and accurate detection and quantification of various microbiological parameters in water. Water testing. Our principal products are the Colilert, Colilert-18, and Colisure tests, which detect the presence of total coliforms and E. coli in water. These organisms are broadly used as microbial indicators for potential fecal contamination in water. Our products utilize nutrient-indicators that produce a change in color or fluorescence when metabolized by target microbes in the sample. Our water tests are used by government laboratories, water utilities and private certified laboratories to test drinking water in compliance with regulatory standards, including U.S. Environmental Protection Agency (“EPA”) standards. The tests also are used in evaluating water used in production processes (for example, in beverage and pharmaceutical applications) and in evaluating bottled water, recreational water, wastewater, and water from private wells.We also sell consumables, parts, and accessories to be used with many of our water testing products. Enterolert. Our Enterolert products detect the presence of enterococci in drinking, waste, and recreational waters. Enterococci, bacteria normally found in human and animal waste, are organisms broadly used as microbial indicators for potential fecal contamination in water. Pseudalert. Our Pseudalert products detect the presence of Pseudomonas aeruginosa in pool, spa, and bottled water. Pseudomonas aeruginosa is a pathogen that can cause “hot-tub rash,” “swimmer’s ear”, and potentially fatal infections in individuals with weakened immune systems. Filta-Max and Filta-Max xpress. Our Filta-Max and Filta-Max xpress products are used in the detection of Cryptosporidium and Giardia in water. Cryptosporidium and Giardia are parasites that can cause potentially fatal gastrointestinal illness if ingested. We also distribute certain water testing kits manufactured by Thermo Fisher Scientific, Inc. that complement our Cryptosporidium and Giardia testing products. Legiolert. Our Legiolert product is a simple culture method test for the detection of Legionella pneumophila, the most common Legionella species in water and the primary cause of Legionnaires’ disease. The Legiolert test is designed to be used on potable or non-potable water sources with results in seven days. Quanti-Tray products. Our Quanti-Tray products, when used in conjunction with our Colilert, Colilert-18, Colisure, Enterolert, Pseudalert, Heterotrophic Plate Count ("HPC") or Legiolert products, provide users quantitative measurements of microbial contamination rather than a presence/absence indication. Our Quanti-Tray Sealer PLUS, and Quanti-Tray Sealer 2X are used with the Quanti-Tray products for the determination of bacterial density in water samples. Our SimPlate for HPC product detects the total number of the most common bacteria in a water sample. Livestock, Poultry and Dairy (“LPD”) - LPD provides diagnostic tests, services, and related instrumentation that are used to manage the health status of livestock and poultry, to improve dairy efficiency, and to ensure the quality and safety of milk. Livestock, Poultry and Heard Health Screening. We sell diagnostic tests, services and related instrumentation that are used to manage the health status of livestock and poultry, to improve producer efficiency, and to ensure the quality and safety of milk. Our livestock and poultry diagnostic products are purchased by government and private laboratories that provide testing services to livestock veterinarians, producers, and processors. Our herd health screening services are offered to livestock veterinarians and producers. Our principal livestock and poultry diagnostic products include tests for Bovine Viral Diarrhea Virus (“BVDV”), Porcine Reproductive and Respiratory Syndrome (“PRRS”), and African Swine Fever ("ASFV"). BVDV is a common and contagious viral infection that suppresses the immune system, making the animal susceptible to a host of other infections, impacting beef and dairy production yields as a result. PRRS is a contagious virus causing reproductive problems and respiratory diseases in swine, leading to increased piglet mortality, reduced growth, and vulnerability to secondary infections. Our RealPCR ASFV Test is a real-time polymerase chain reaction ("PCR") assay that provides early and accurate detection of ASFV supporting prevention, control, and eradication programs by veterinarians and producers. Dairy products. Our principal dairy products use our SNAP test platform and are used by dairy producers and processors worldwide to detect antibiotic drug residue in milk. Our primary product lines are SNAP Beta-Lactam ST and SNAPduo Beta-Tetra ST, which detect certain beta lactam and tetracycline antibiotic residues. We also sell SNAP tests for the detection of certain other contaminants in milk, such as Aflatoxin M1. Other - Our Other operating segment combines and presents our products and services for the human medical diagnostics market (“OPTI Medical”) with our out-licensing arrangements because they do not meet the quantitative or qualitative thresholds for reportable segments. 9


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    OPTI Medical. Through OPTI Medical, we sell point-of-care analyzers and related consumables for use in human medical hospitals and clinics to measure electrolytes, blood gases, acid-base balance, glucose, lactate, blood urea nitrogen and ionized calcium, and to calculate other parameters such as base excess and anion gap. These OPTI analyzers are used primarily in emergency rooms, operating rooms, cardiac monitoring areas and other locations where time-critical diagnostic testing is performed within the hospital setting. Our OPTI CCA-TS2 Blood Gas and Electrolyte analyzer contains many new features relative to previous generation blood gas analyzers including customized work flows, faster time to result, improved communication, and a multi-level electronic control. Similar to our earlier generation OPTI CCA and OPTI Touch Electrolyte analyzers, the OPTI CCA-TS2 runs whole blood, plasma, and serum samples on single-use disposable cassettes that contain various configurations of analytes. Through OPTI Medical we also provide human COVID-19 testing products and laboratory services. On May 7, 2020, we announced that OPTI Medical was granted by the United States Food and Drug Administration ("FDA") an Emergency Use Authorization ("EUA") for the OPTI SARS-CoV-2 RT-PCR laboratory test kit for the detection of SARS-CoV-2, the virus that causes COVID-19. On June 5, 2020 OPTI Medical announced that it has received the CE mark certification in the European Union for its OPTI SARS-CoV-2 RT-PCR laboratory test kit. Additionally, the FDA has granted EUA for the new OPTI DNA/ RNA Magnetic Bead Kit for nucleic acid extraction from respiratory samples to be used with the OPTI SARS-CoV-2 RT-PCR test kit, which enables OPTI Medical Systems to provide laboratories with a complete OPTI Medical Systems-manufactured workflow solution for COVID-19 testing. We also provide human COVID-19 testing laboratories services to the Maine Center for Disease Control and Prevention in support of their COVID-19 testing program. Other Activities. We own certain drug delivery technology intellectual property, that we continue to seek to commercialize through agreements with third parties, such as pharmaceutical companies, that are included in the Other segment. Additional information about of our products and services can be found on our website. MARKETING AND DISTRIBUTION We market, sell, and service our products worldwide through our marketing, customer service, sales, and technical service groups, as well as through independent distributors and other resellers. We maintain sales offices outside the U.S. in all major regions including Africa, Asia Pacific, Canada, Europe, Middle East, and Latin America. Generally, we select the appropriate distribution channel for our products based on the type of product, technical service requirements, number and concentration of customers, regulatory requirements, and other factors. We market our companion animal diagnostic products to veterinarians directly in the U.S. Outside the U.S., we sell our companion animal diagnostic products through our direct sales force and, in certain countries, through distributors and other resellers. We sell our veterinary reference laboratory diagnostic and consulting services worldwide, generally through our direct sales force. We market our diagnostic imaging products primarily through our direct sales force in the U.S. and Canada. We market our software products primarily through our direct sales force in the U.S., Canada, Europe, and Australia. We market our Water and LPD products primarily through our direct sales force in the U.S. and Canada. Outside the U.S. and Canada, we market these products through our direct sales force and, in certain countries, through selected independent distributors. We sell our OPTI products and services both directly and through independent human medical product distributors. RESEARCH AND DEVELOPMENT Our business includes the development and introduction of new products and services and may involve entry into new business areas. We maintain active research and development programs in each of our business segments. Our research and development expenses, which consist of salaries, employee benefits, materials and external consulting and development costs, were $141.2 million for the year ended December 31, 2020, or 5.2% of our consolidated revenue, $133.2 million for the year ended December 31, 2019, or 5.5% of our consolidated revenue and $117.9 million for the year ended December 31, 2018, or 5.3% of our consolidated revenue. 10


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    PATENTS AND LICENSES We actively seek to obtain patent protection in the U.S. and other countries for inventions covering our products and technologies. We also license patents and technologies from third parties. Patents and licenses of patents and technologies from third parties are considered important to the Company based on a variety of factors, including providing protection for the Company’s inventions and other proprietary intellectual property; affording protection from competitors in certain markets; enabling the use of more effective and efficient technologies in the development and production of our products and offerings; strengthening our reputation and standing among customers, employees and key suppliers; and acting as a deterrent against counterfeiters, imitators and other copiers of technologies. Important patents and licenses include: • An exclusive license from Cornell University to patents covering methods for detecting BVDV that started to expire in 2017 and will continue into 2022; • Patents relating to reagents and methods for the detection of Anaplasma phagocytophilum utilized in certain of our SNAP products that started to expire in 2017 and will continue into 2022; • Patents relating to reagents and methods for the detection of Ehrlichia canis utilized in certain of our SNAP products that began to expire in 2019 and will continue into 2022; • Patents concerning Catalyst consumables that expire beginning in 2020 and will continue into 2035; • Patents concerning Catalyst instruments that expire beginning in 2026 and will continue into 2032; • Patents relating to reagents and methods for the detection of canine pancreatic lipase that expire in 2026; and • Patents relating to reagents and methods for the detection of SDMA that expire beginning in 2029 and will continue into 2037. While we consider these proprietary technology rights to be important to us, a range of factors help to mitigate the future effects of patent and license expiration on our results of operations and financial position. These factors include publications, including peer-reviewed third-party studies, that demonstrate the accuracy of our products; our brand strength and reputation in the marketplace; the breadth, quality and integration of our product offerings; our existing customer relationships and our customer support; our sales force; our online ordering platform that enables direct ordering of (including establishing automatic reorder schedules for) our consumables, tests and other products by our customers; the applicable regulatory approval status for certain products; our continued investments in innovative product improvements that often result in new technologies and/or additional patents; our investment in diagnostic innovations that results in new product offerings that often are patentable and that expand the test menu for our in-clinic instruments and/or reference laboratory business; and our significant know-how, scale and investments related to manufacturing processes of associated product offerings and certain supply arrangements for consumables that are compatible with our instruments. Although we have several patents and licenses of patents and technologies from third parties that expired during 2020, and are expected to expire in 2021 and beyond, the expiration of these patents, individually or in the aggregate, is not expected to have a material effect on the Company’s financial position or future operations. In addition, we already face notable competition in certain areas as other companies have been successful in bringing competitive products to market, despite the protections afforded by these proprietary technology rights. To the extent some of our products may now, or in the future, embody technologies protected by patents, copyrights, or trade secrets of others, we may be required to obtain licenses to such technologies in order to continue to sell our products. These licenses may not be available on commercially reasonable terms or at all. Our failure to obtain any such licenses may delay or prevent the sale of certain new or existing products. See “Part I, Item 1A. Risk Factors.” PRODUCTION AND SUPPLY Many of the instruments that we sell are manufactured by third parties. We rely on third parties in our supply chain to supply us, and our direct suppliers, with certain important components, raw materials and consumables used in or with our products. In some cases, these third parties are sole or single source suppliers. From time to time, we seek to qualify alternative suppliers. Instruments and consumables. Significant products supplied by sole and single source providers include certain Catalyst Dx and Catalyst One consumables (other than electrolyte consumables and the fructosamine, T4, CRP, progesterone, and SDMA slides), VetTest slides, VetLyte consumables, LaserCyte Dx consumables, VetAutoread and ProCyte Dx analyzers 11


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    and consumables, SediVue Dx urinalysis instruments and consumables, and certain components of our internally manufactured analyzers. VetTest and certain Catalyst chemistry slides are supplied by Ortho under supply agreements that are currently set to expire in December of 2031. We are required to purchase all of our requirements for our current menu of Catalyst and VetTest chemistry slides from Ortho to the extent Ortho is able to supply those requirements. The agreements provide for pricing based on purchase volumes and a fixed annual inflationary adjustment. The agreements also prohibit Ortho from promoting and selling these chemistry slides in the veterinary market, excluding the EU, other than to IDEXX. We purchase other analyzers and consumables under supply agreements with terms extending through 2034, which in some cases may be extended at our option. We have minimum purchase obligations under some of these agreements, and our failure to satisfy these obligations may result in loss of some or all of our rights under these agreements. See “Part I, Item 1A. Risk Factors.” Other components. We purchase certain other products, raw materials, and components from sole and single source suppliers. These products include certain diagnostic imaging systems and certain components used in our SNAP rapid assay and dairy devices, livestock, and poultry testing kits and water testing products. We have been successful in ensuring an uninterrupted supply of products purchased from sole and single source suppliers. However, there can be no assurance that uninterrupted supply can be maintained if these agreements terminate for any reason or our suppliers otherwise are unable to satisfy our requirements for products. See “Part I, Item 1A. Risk Factors.” BACKLOG We do not generally maintain a significant backlog of orders and believe that our backlog at any particular date historically has not been indicative of future sales. COMPETITION We compete with many companies ranging from large human and animal health pharmaceutical and medical diagnostics companies to small businesses focused on animal health. Our companion animal veterinary diagnostic products and services compete with both reference laboratory service and in-clinic product providers. Our competitors vary in our different markets. In some markets, academic institutions, governmental agencies, and other public and private research organizations conduct research activities and may commercialize products or services which could compete with our products, on their own or through joint ventures. Several of our direct and potential competitors have substantially greater financial and managerial resources than us, as well as greater experience in manufacturing, marketing, research and development, and obtaining regulatory approvals than we do. For more information on risks related to our competition, see “Part I, Item 1A. Risk Factors." Competitive factors in our different business areas are detailed below: • Companion animal diagnostic offerings. We compete primarily on the basis of ease of use and speed of our products, diagnostic accuracy, product quality, breadth of our product line and services, unique product innovations, fully integrated technology, information management capability, availability of medical consultation, effectiveness of our sales and distribution channels, quality of our technical and customer service, and our pricing relative to the value of our products and services in comparison with competitive products and services. Our major competitors in most geographic locations in North America are Antech Diagnostics, a unit of VCA Inc., a division of Mars, Incorporated; Zoetis Inc. (including its wholly-owned subsidiary Abaxis, Inc.); Heska Corporation; Samsung Electronics Co., Ltd., and FUJIFILM North America Corporation. We also compete in certain international markets with Zoetis, Fujifilm Holdings Corporation, Samsung Electronics, Arkray, Inc., Heska, Mindray and BioNote, Inc. • Water, livestock, poultry, and dairy testing products. We compete primarily on the basis of the ease of use, speed, accuracy, product quality and other performance characteristics of our products and services (including unique tests), the breadth of our product line and services, the effectiveness of our sales and distribution channels, the quality of our technical and customer service, our ability to receive regulatory approvals from governing agencies and our pricing relative to the value of our products in comparison with competitive products and services. Our competitors include highly focused smaller companies and multibillion-dollar companies with small livestock and poultry diagnostics and water testing solution franchises. 12


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    • Veterinary Software, Services and Diagnostic Imaging Systems. We compete primarily on the basis of functionality, connectivity to equipment and other systems, performance characteristics, effectiveness of our implementation, training process and customer service, information handling capabilities, advances in technologies and our pricing relative to the value of our products and services. We sell these products primarily in North America and Europe. Our largest competitor in North America and the U.K. is Covetrus, Inc., which offers several systems and leverages its animal health distribution business in sales and service. We also compete with numerous focused smaller companies throughout the markets in which we offer veterinary software, including those offering cloud-based solutions. Our competitors in the diagnostic imaging systems market include Sound-Eklin, Antech Diagnostics, FUJIFILM, and Heska. • Human point-of-care medical diagnostics market. We compete primarily on the basis of the ease of use, menu, convenience, international distribution and service, instrument reliability, and our pricing relative to the value of our products. We compete primarily with large human medical diagnostics companies such as Radiometer A/S, Siemens Medical Solutions Diagnostics, Instrumentation Laboratory Company, Abbott Diagnostics, a division of Abbott Laboratories and Roche Diagnostics Corporation. We also compete with a number of companies around the world that produce human COVID-19 testing. GOVERNMENT REGULATION Many of our products are subject to comprehensive regulation by U.S. and foreign regulatory agencies that relate to, among other things, product approvals, product registrations, manufacturing, import, export, distribution, marketing and promotion, labeling, recordkeeping, testing, quality, storage, product disposal, environmental compliance, and workplace safety. The following is a description of the principal regulations affecting our businesses. Veterinary diagnostic products. These products include our diagnostic test kits for companion and food animal infectious diseases, including most of our livestock and poultry products and our rapid assay products. These products are licensed and regulated in the U.S. by the Center for Veterinary Biologics within the United States Department of Agriculture (“USDA”) Animal and Plant Health Inspection Service (“APHIS”). These products must be approved by APHIS before they may be sold in and from the U.S. The APHIS regulatory approval process involves the submission of product validation data, including manufacturing process and facility documentation. Following regulatory licensure to market a product, APHIS requires that each lot of product be submitted for test review before release to customers. In addition, APHIS requires special approval to market products where test results are used in part for government-mandated disease management programs. A number of foreign governments accept APHIS approval to support product registration for sale, distribution, and use within their countries. However, compliance with extensive country-specific regulatory processes is required in connection with importing and marketing diagnostic products in Japan, Germany, Canada, Brazil, the Netherlands, China, and many other countries. We are also required to have a facility license from APHIS to manufacture USDA-licensed products. We have a facility license for our manufacturing facility in Westbrook, Maine which also covers our distribution center in Memphis, Tennessee. Our LPD manufacturing facility in Montpellier, France has been approved by APHIS and we have a permit to import one LPD product manufactured in Montpellier, France to the U.S. for distribution. Our veterinary diagnostic slide and instrument systems, including T4, fructosamine, progesterone, CRP, and SDMA, are veterinary medical devices regulated by the FDA under the Food, Drug and Cosmetics Act (the “FDC Act”). Other FDA regulated products include our non-licensed Rapid Assay products such as SNAP Pancreatic Lipase, Cortisol, Bile Acid, Foal IgG, and ProBNP. While the sale of these products does not require premarket approval by the FDA and does not subject us to FDA inspections or the FDA’s current Good Manufacturing Practices regulations (“cGMP”), the FDC Act specifies that these products must not be adulterated, mislabeled, or misbranded. Water testing products. Our water tests are not subject to formal premarket regulatory approval. However, before a test can be used as part of a water quality monitoring program in the U.S. that is regulated by the EPA, the test must first be approved by the EPA. The EPA approval process involves submission of extensive product performance data in accordance with an EPA-approved protocol, evaluation of the data by the EPA and publication for public comment of any proposed approval in the Federal Register before final approval. Our Colilert, Colilert-18, Colisure, Quanti-Tray, Filta-Max xpress, Enterolert and SimPlate for heterotrophic plate counts products have been approved by the EPA for use under various regulatory programs. Water testing products are subject to similarly extensive regulatory processes in other countries around the world. 13


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    Dairy testing products. Dairy products used in National Conference on Interstate Milk Shipments (“NCIMS”) milk- monitoring programs in the U.S. are regulated by the FDA as veterinary medical devices. However, before products requiring FDA approval can be sold in the U.S., performance data must be submitted in accordance with an FDA-approved protocol administered by an independent body, such as the Association of Analytical Communities Research Institute (“AOAC RI”). Following approval of a product by the FDA, the product must also be approved by NCIMS, an oversight body that includes state, federal and industry representatives. Our SNAP Beta-Lactam antibiotic residue test product has been approved by the FDA, NCIMS and AOAC RI for sale in the U.S. While some foreign countries accept AOAC RI approval as part of their regulatory approval process, many countries have separate regulatory processes. Human point-of-care electrolyte and blood gas analyzers. Our OPTI instrument systems are classified as Class I and/or Class II medical devices, and their design, manufacture and marketing are regulated by the FDA. Accordingly, we must comply with cGMP in the manufacture of our OPTI products. The FDA’s Quality System regulations further set forth standards for product design and manufacturing processes, require the maintenance of certain records and provide for inspections of our facilities by the FDA. New OPTI products fall into FDA classifications that require notification of and review by the FDA before marketing, and which are submitted as a 510(k) application. These OPTI products are also subject to the regulations governing the manufacture and marketing of medical devices in other countries in which they are sold, including the In Vitro Diagnostic Regulation in Europe which imposes stricter requirements for the marketing and sale of In Vitro Diagnostics. Human COVID-19 test products. OPTI manufactures, sells and distributes PCR and antibody ELISA test kits for the detection of the virus that causes COVID-19. These test kits are subject to regulation by the FDA pursuant to the U.S. Federal Food, Drug and Cosmetic Act, and more specifically, are sold and distributed pursuant to FDA Emergency Use Authorization. These products are also subject to the European Medical Device Directives which requires CE-IVD marking, and regulations governing the manufacture and marketing of medical devices in other countries in which they are sold. Other Environmental Regulations. All IDEXX products must comply with applicable global product regulations, including those governing consumer product safety and materials requirements such as the Europeans Union's Electromagnetic Compatibility ("EMC") Directive, the European Regulation for Registration, Evaluation, Authorization and Restriction of Chemical Substances ("REACH"), the Restriction of Hazardous Substances ("RoHS") Directive, and the Waste Electrical and Electronic Equipment ("WEEE") Directive. These complex regulatory requirements create risk to IDEXX’s ability to market and sell our products, our business and our financial performance. For more information about the risks associated with various U.S. and foreign government regulation, see "Various U.S. and foreign government regulations could limit or delay our ability to market and sell our products or otherwise negatively impact our business" under "Part I, Item 1A. Risk Factors." In the European Union, our analyzers and certain associated equipment are subject to the requirements of the RoHS Directive, which regulates and restricts certain hazardous substances in electrical and electronic equipment. Other countries, including China, Russia, the United Arab Emirates, and Turkey have implemented or anticipate implementing regulatory regimes similar to the RoHS Directive. Our veterinary diagnostic instrument systems are not subject to regulation under the European Medical Device Directive or the In Vitro Diagnostic Directive, which are both strictly applicable to human use products. However, these systems are required to meet CE certification, which required compliance with the RoHS Directive, the EMC Directive, and other safety requirements. Similar requirements are specified by most counties in which we sell our products and are subject to increasing harmonization globally. The European Union was among the first to regulate and restrict the use of certain substances that we currently use in our products. These requirements include the Biocidal Products Regulation, which requires the use of approved biocides in our products prior to being exported to the European Union, and REACH, which regulates and restricts the use of certain chemicals in the European Union. Compliance with these regulations (and similar regulations that have been or may be adopted elsewhere, such as Turkey, Korea, and other countries) may require registration of the applicable substances or the redesign or reformulation of our products. Some of our products, including some of our Companion Animal products, may be subject to pending restriction of microplastics pursuant to REACH. In the US, the EPA regulates chemical use similarly to the EU. In addition, certain states have their own chemical regulations, such as California's Proposition 65, which requires businesses to provide warnings to California residents about significant risk of exposures to chemicals in products that are known to cause cancer, birth defects or other reproductive harm. In addition to the foregoing, our business is generally subject to various U.S. and foreign regulatory authorities, including the U.S. Federal Trade Commission (the “FTC”) and other anti-competition authorities, and we are also subject to anti-bribery and anti-corruption laws, such as the Foreign Corrupt Practices Act, import and export laws and regulations, including U.S. import and export control and sanctions laws, and laws and regulations governing the collection, use, retention, 14


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    sharing and security of data. Development or acquisition of new products and technologies may subject us to additional areas of government regulation. These may involve medical device, water-quality and other regulations of the FDA, the EPA, the USDA, the FTC, and other federal agencies, as well as state, local and foreign governments. HUMAN CAPITAL As innovation and customer focus are key parts of our strategy to create long-term value, we aim to attract, motivate, develop, and retain talented employees at all levels who are aligned with and passionate about our Purpose. We believe that finding, developing and retaining a world-class global workforce requires that we build and sustain an inclusive, ethical culture that values diversity, equity and inclusion; offers competitive and locally relevant compensation and benefits; and provides growth and development opportunities. Because our strategy includes developing strong, deep relationships with our veterinary customers, we have focused on growing our global companion animal diagnostics field-based organization. Since 2011, we have grown that organization almost 2.5 times, creating a world-class and experienced companion animal diagnostics field-based professional organization. Diversity, Equity, and Inclusion. Through diversity, equity, and inclusion ("DEI") efforts, we strive to ensure our global workplaces are dynamic, supportive of all our employees, and representative of our customers and communities. We believe that DEI is an essential driver of our innovation and success. Diverse talent is the foundation of a healthy and strong business. Our global recruiting team connects our sourcing strategies with diversified talent channels and adopts core competencies that focus on valuing differences, to attract candidates with different backgrounds, ideas, and experiences who will help enrich our culture. Our entrepreneurial and collaborative spirit is enhanced when many different people, perspectives, and backgrounds are aligned toward achieving our Purpose. As of December 31, 2020, we had approximately 9,300 regular full-time and part-time employees, with women representing 57% of our employees, and underrepresented minorities in the U.S. (defined as those who self-identify as Black/ African American, Asian, Hispanic/Latinx, Native American, Pacific Islander and/or two or more races) representing an estimated 22% of our U.S. employees. As of December 31, 2020, our global senior leadership team is 30% female, while global senior executives are 25% female. During 2020, our voluntary employee turnover rate was approximately 8%. In addition, we contract with a number of temporary and contract employees. We employ inclusive recruitment practices to source diverse candidates and mitigate potential bias. We also help drive diversity across our industry by actively supporting our customers, suppliers, educational institutions, community partners, and peers as they work to improve diversity, equity, and inclusion in their own workplaces, policies and practices. Compensation, Benefits and Well-being. We offer fair, competitive compensation and benefits that support our employees’ overall well-being. To ensure alignment with our short- and long-term objectives, our compensation programs for all employees include base pay, short-term incentives, and opportunities for long-term incentives. We offer a wide array of competitive and locally relevant benefits (which vary by country and region) including comprehensive health and welfare insurance, generous time-off and leave, and retirement and financial support. We provide emotional well-being services through our Employee Assistance Program and a variety of interactive resources as well as lifestyle coaching, a global well-being speaker series, and ergonomic programs that help support employees’ physical well-being. In addition, a majority of our employees have access to financial education and our U.S. employees can engage with a financial wellness coach for further tools and resources to reach their personal financial goals. In response to the COVID-19 pandemic, we implemented significant changes that we determined were in the best interest of our employees as well as the communities in which we operate. This includes having the vast majority of our employees work from home, while implementing additional safety measures for employees continuing critical on-site work. We have also provided a work-from-home fund to assist employees in that transition and added several company-wide paid days off and caregiving support to help employees balance their work and life responsibilities. Growth and Development. We are steadfast in our focus on cultivating the diverse leaders of tomorrow and making career development opportunities more accessible across the global organization. Our training is 100% virtual and available in multiple languages. Our career development programs are designed to build capabilities and enable career progression. We also encourage our employees to enhance their career development through job-related courses and degree programs. 15


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    ENVIRONMENTAL, SOCIAL AND GOVERNANCE During 2020, we established the IDEXX Foundation, a donor-advised fund administered by a national donor-advised fund program, with a contribution of $10 million, to support activities aligned with our Purpose. Our most recent Corporate Responsibility Report is available on our website and features examples of our ESG activities, performance metrics, and goals for the next few years. AVAILABLE INFORMATION Our principal executive offices are located at One IDEXX Drive, Westbrook, Maine 04092, our telephone number is 207-556-0300, and our internet address is www.idexx.com. References to our website in this Annual Report on Form 10-K are inactive textual references only and the content of our website should not be deemed incorporated by reference for any purpose. We make available free of charge at www.idexx.com our Annual Report on Form 10-K, Quarterly Reports on Form 10-Q, Current Reports on Form 8-K, and amendments to those reports filed or furnished pursuant to Section 13(a) or 15(d) of the Exchange Act as soon as reasonably practicable after we file such information with, or furnish it to, the SEC. In addition, copies of our reports filed electronically with the SEC may be accessed at www.sec.gov. Our Corporate Governance Guidelines and our Code of Ethics are also available on our website at www.idexx.com. 16


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    ITEM 1A. RISK FACTORS You should consider carefully the risks and uncertainties described below in addition to the other information included or incorporated by reference in this Annual Report on Form 10-K in evaluating our company and our business. Our future operating results involve a number of risks and uncertainties and actual events or results may differ materially from those discussed in this Annual Report on Form 10-K. Factors that could cause or contribute to such differences include, but are not limited to, the factors discussed below, as well as those factors discussed elsewhere herein. Any of these factors, in whole or in part, could materially and adversely affect our business, financial condition, operating results and stock price. RISK RELATED TO THE COVID-19 PANDEMIC The effects of the ongoing COVID-19 pandemic could have a material adverse impact on our business, results of operations, liquidity, financial condition, and stock price. The ongoing COVID-19 pandemic has increased economic uncertainty, caused economic slowdowns that may continue or recur and disrupted business activity. If weakened economic conditions reduce our customers' ability or willingness to pay for our products and service or our suppliers' ability to provide products and services to us, then our business, results of operation, liquidity, financial condition, and stock price could be negatively impacted, and these impacts could be material. The spread of COVID-19 has caused us to modify aspects of our business practices (including the management of and access to our facilities, employee remote work locations, and employee travel), and we may take further actions, as may be required by federal, state, and local governments or as we determine to be in the best interests of our employees and customers. Such actions may disrupt our supply chain, operations, facilities, and employee workforce, which could negatively affect our employees' efficiency and productivity; our development and introduction of innovative new products and services; our ability to manufacture, market and sell our products and services; and our financial performance. In addition, the social distancing procedures and guidelines, including stay-at-home orders that may be further deployed to combat the spread of COVID-19, and possible higher infection rates could result in a decrease in companion animal clinical visits, the delay of elective procedures and wellness visits and disruption of veterinary clinic operations, all of which would have a negative effect on veterinary service providers and result in declines in demand for our CAG products and services, which represented 88% of our 2020 consolidated revenues. If stay-at-home orders are re-implemented periodically to combat the spread of COVID-19, particularly in the United States, the negative impact on veterinary service providers and their businesses, and correspondingly on demand for our CAG products and services, may be material. Weakened economic conditions caused by the effects of the COVID-19 pandemic have reduced, and may further reduce, demand for our water testing products, livestock and poultry diagnostic tests and dairy products due to reduced testing or disruptions in livestock, poultry, dairy, or other food supply and distribution chains and markets that could negatively impact the related production markets. If economic slowdowns continue or recur, the decline in our customers' demand for our water testing products, livestock and poultry diagnostic tests and dairy products may be significant. In the second quarter of 2020, we began selling our new OPTI COVID-19 human PCR test products and services, and these sales were the primary contributor to our Other segment's revenue growth in 2020. The future demand for these products and services, (and our other COVID-19-related products and services) is difficult to project given the uncertain nature of the COVID-19 pandemic, including short-term project commitments, available PCR testing capacity, alternative suppliers and the potential impact of vaccinations and other treatments, and there can be no assurance that sales of this product (and our other COVID-19-related products and services) will continue. While demand for our CAG products and services recovered in the latter half of 2020, this recovery was due in part to pent-up demand following a period during which access to veterinary clinics was constrained due to governmental policies. Demand also increased in the second half of 2020 driven by other factors, including an increase in pet ownership and higher levels of diagnostic test frequency and utilization, which may have been aided by factors related to the pandemic. There can be no assurance that this increased demand will be sustained, and the environment remains uncertain. The degree to which the COVID-19 pandemic ultimately impacts our business, results of operations, liquidity, financial condition and stock price depends on future developments that are unpredictable and most of which are outside of our control, including the duration, scope and severity of the pandemic, the availability and effectiveness of vaccinations and other treatment, related governmental advisories and restrictions to contain COVID-19, and how quickly economic conditions improve once the COVID-19 pandemic subsides. There can be no assurance that we will be able to prevent or mitigate any or all of the COVID-19 near- or long-term adverse impacts, which could be material. 17


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    RISKS RELATED TO OUR BUSINESS AND INDUSTRY Because our business lines are highly attractive, they are also highly competitive. Our failure to successfully execute certain strategies within this competitive environment could have a material negative impact on our future growth and profitability The companion animal healthcare industry is highly competitive, and we anticipate increasing levels of competition from both existing competitors and new market entrants given our performance and the market’s strong growth and returns. Our ability to maintain or enhance our growth rates and our profitability depends on our successful execution of many elements of our strategy, including: • Developing, manufacturing, and marketing innovative new or improved and cost competitive in-clinic laboratory analyzers that drive sales of IDEXX VetLab instruments, grow our installed base of instruments and increase demand for related recurring sales of consumable products, services, and accessories; • Developing and introducing new proprietary diagnostic tests and services for both our reference laboratories and in-clinic applications that provide valuable medical information to our customers and effectively differentiate our products and services from those of our competitors; • Increasing the value to our customers of our companion animal products and services by enhancing the integration of the information and transactions of these products and the management of diagnostic information derived from our products; • Maintaining premium pricing, including by effectively implementing price increases, for our differentiated products and services through, among other things, effective communication and promotion of the value of our products and services in an environment where many of our competitors promote, market, and sell lesser offerings at prices lower than ours; • Providing our veterinary customers with the medical and business tools, information, and resources that enable them to grow their practices and the utilization of our diagnostic products and services, through increased pet visits, use of preventive care protocols and enhanced practice of real-time care; • Achieving cost improvements in our worldwide network of reference laboratories by implementing global best practices, including lean processing techniques, incorporating technological enhancements, including laboratory automation and a global laboratory information management system, employing purchasing strategies to maximize leverage of our global scale, increasing the leverage of existing infrastructure and consolidating testing in high volume laboratory hubs; • Achieving cost improvements in the manufacture and service of our in-clinic laboratory analyzers by employing the benefits of economies of scale in both negotiating supply contracts and leveraging manufacturing overhead, and by improving reliability of our instruments; • Continuing to expand, develop, and advance the productivity of our companion animal diagnostic sales, marketing, customer support and logistics organizations in the U.S. and international markets in support of, among other things, our all-direct sales strategies; • Attracting, developing, and retaining key leadership and talent necessary to support all elements of our strategy, which is challenging due to the increasingly competitive and tight labor markets in which we operate; • Expanding our served market and growing our market share by strengthening our sales and marketing activities both within the U.S. and in geographies outside of the U.S.; • Identifying, completing, and integrating acquisitions that enhance our existing businesses or create new business or geographic areas for us; • Developing and implementing new technology and licensing strategies; and • Continuing to effectively manage our growth and expansion on a global scale through, among other things, designing and implementing cost-effective improvements to our processes, procedures, and infrastructure. If we are unsuccessful in implementing and executing on some or all of these strategies, our rate of growth or profitability may be negatively impacted. 18


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    Our dependence on third-party suppliers could limit our ability to sell certain products or negatively affect our operating results We rely on third-party suppliers to provide components and raw materials (including biological materials) for our manufactured products, manufacture some of the products that we sell, and perform certain services, including package- delivery services. Actions taken by third-party suppliers in operating their business, as well as any disruptions to their business operations (or their supplier's business operations), could disrupt our supply chain or operations and materially negatively impact our ability to supply the market, substantially decrease sales, lead to higher costs, and damage our reputation with our customers. Longer-term disruptions could potentially result in the permanent loss of our customers, which could reduce our recurring revenues and long-term profitability. For examples of some of the events that could result in disruption to our supply chain or operations, and negatively impact our operating results, see “We are increasingly dependent on the continuous and reliable operation of our information technology systems, and a disruption of these systems or significant security breaches could adversely affect our business” and "Factors and events beyond our control, including natural and other disasters and climate change-related events, could disrupt our operations or our supply chain and adversely affect our business" below. In addition, we currently purchase many products, components, and materials from sole or single sources. Some of these products are proprietary and, therefore, cannot be readily or easily replaced by alternative sources. These products, components, and materials are used in a majority of our instruments, including our Catalyst Dx, Catalyst One, and ProCyte Dx; consumables and accessories used in our instruments; livestock and poultry diagnostic tests, dairy testing products, and water testing products. Even if products, components, and materials were to become available to us from alternative suppliers, we likely would incur additional costs and delays in identifying or qualifying replacement materials and there can be no assurance that replacements would be available to us on acceptable terms, or at all. In certain cases, we may be required to obtain regulatory approval to use alternative suppliers, and this process of approval could delay production of our products or development of product candidates indefinitely. We seek to mitigate sole and single source suppliers risks on a risk-prioritized basis and in a variety of ways, including, when possible, by identifying and qualifying alternative suppliers, developing applicable in-house manufacturing capabilities and expertise, and entering into escrow arrangements for manufacturing information for certain single or sole- sourced products. We also seek to enter into long-term contracts that provide for an uninterrupted supply of products at predictable or fixed prices. However, there can be no assurance that we will successfully implement any of these mitigating activities or that, if implemented, any of them will be effective in preventing any delay or other disruption in our ability to supply the market. In addition, suppliers may decline to enter into long-term contracts for any number of reasons, which would require us to purchase products, components, or raw materials via short-term contracts or on a purchase order basis. There can be no assurance that suppliers with which we do not have long-term contracts will continue to supply our requirements, will always fulfill their obligations under those contracts, or will not experience disruptions in their ability to supply our requirements. In cases where we purchase sole and single source products, components, or raw materials under purchase orders, we are more susceptible to unanticipated cost increases or changes in other terms of supply. In addition, under some contracts with suppliers we have minimum purchase obligations, and our failure to satisfy those obligations may result in loss of some or all of our rights under these contracts or require us to compensate the supplier. If we are unable to obtain adequate quantities of products, components, or raw materials in the future from sole and single source suppliers, or if such sole and single source suppliers are unable to obtain the components or other materials required to manufacture the products, we may be unable to supply the market, which could have a material adverse effect on our results of operations, and any longer-term disruptions could potentially result in the permanent loss of customers, which could reduce our recurring revenues and long-term profitability. Our biologic products are complex and difficult to manufacture, which could negatively affect our ability to supply the market Many of our rapid assay, livestock and poultry diagnostic, water and dairy products are biologic products that include biological materials, such as antibodies, cells, and sera. Manufacturing biologic products is highly complex due to the inherent variability of biological materials and the difficulty of controlling the interactions of these materials with other components of the products, samples, and the environment. There can be no assurance that we will be able to maintain adequate sources of biological materials or that we will be able to consistently manufacture biologic products that satisfy applicable product release criteria and regulatory requirements. Further, products that meet release criteria at the time of manufacture may fall out of specification while in customer inventory, which could require us to incur expenses associated with recalling products and providing customers with new products, either of which could damage customer relations. Our inability to produce or obtain necessary biological materials or to successfully manufacture biologic products that incorporate such materials could result in our inability to supply the market with these products, which would have an adverse effect on our results of operations. 19


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    Various U.S. and foreign government regulations could limit or delay our ability to market and sell our products or otherwise negatively impact our business As a global business, we sell products and services in more than 175 countries and operate in an increasingly complex legal and regulatory environment. In the U.S., the manufacture and sale of certain of our products are regulated by agencies such as the USDA, the FDA, and the EPA. Our diagnostic tests for animal health applications that involve the detection of infectious diseases, including most rapid assay canine and feline SNAP tests and livestock and poultry diagnostic tests, must be approved by the USDA prior to sale in the U.S. Our dairy testing products as well as the manufacture and sale of our OPTI line of human point-of-care electrolytes and blood gas analyzers require approval by the FDA before they may be sold commercially in the U.S., and our OPTI PCR test kits for the detection of the virus that causes COVID-19, are subject to regulation by the FDA and sold and distributed pursuant to Emergency Use Authorizations issued by the FDA. Our water testing products must be approved by the EPA, as a part of a water quality monitoring program required by the EPA, before they can be used by customers in the U.S. Delays in obtaining regulatory approvals for new products or product upgrades, or any termination, revision or revocation of an Emergency Use Authorization for our test kits, could have a negative impact on our growth and profitability. The manufacture, import, and sale of our products, as well as our research and development processes, are subject to similar and sometimes more stringent laws in many foreign countries. For example, the European Union regulates the use of certain substances that we currently use in our products or processes. These regulations include the Biocidal Products Regulation, which requires the use of approved biocides in our products prior to being manufactured, used, or sold in the European Union; the European Regulation for Registration, Evaluation, Authorization and Restriction of Chemical Substances, or REACH, which regulates and restricts the use of certain chemicals in the European Union; the Restriction of Hazardous Substances("RoHS") Directive, which regulates and restricts certain hazardous substances in electrical and electronic equipment; the Electromagnetic Compatibility Directive; and the Waste Electrical and Electronic Equipment Directive. Compliance with these and similar regulations in the U.S. and abroad may require registration of the applicable substances or the redesign or reformulation of our products and may reduce or eliminate the availability of certain parts and components used in our products and services in the event our suppliers are unable to comply with the applicable regulations in a timely and cost-effective manner. Any redesign or reformulation or restricted supply of parts and components may negatively affect the availability or performance of our products and services, add testing lead-times for products and reformulated products, reduce our margins, result in additional costs, or have other similar effects. In addition, the costs to comply with these regulations may be significant. Any of these could adversely affect our business, financial condition, or results of operations. These legal and regulatory requirements are complex and subject to change, and we continue to evaluate their impact. In addition, some foreign governments require us to register our products before they can be distributed or sold, and these product registration requirements, which vary among the applicable jurisdictions and change from time to time, are often complex and require us to engage in lengthy and costly processes and provide confidential, proprietary information about those products to foreign regulatory agencies. For example, compliance with extensive country-specific regulatory processes is required in connection with importing and marketing our diagnostic products in Japan, Germany, Canada, Brazil, the Netherlands, China, and many other countries. There can be no assurance that we will be able to obtain or maintain any product registration required by one or more foreign governments. Any inability to obtain or maintain a required product registration in a jurisdiction could adversely affect our ability to market and sell the applicable product in that jurisdiction, which could have a negative effect on our business, financial condition and results of operations. There can also be no assurance that confidential, proprietary information provided to foreign regulatory agencies may not be accessed by unauthorized persons or otherwise stolen, which could negatively impact our ability to protect our proprietary rights in our innovative products and our future success. For more information about the risks related to the protection of our proprietary rights in our products and services, see "Our success is heavily dependent on our continued proprietary product and service innovation" below. We are also subject to a variety of federal, state, local, and international laws and regulations governing, as well as legal and political environments that vary broadly regarding, among other things, the importation and exportation of products; our global business practices, such as anti-corruption, anti-money laundering, and anti-competition laws; and immigration and travel restrictions. These legal, regulatory, and political requirements and environments differ among jurisdictions around the world and are rapidly changing and increasingly complex. The costs associated with compliance with these legal and regulatory requirements and adjusting to changing legal and political environments are significant and likely to increase in the future. 20


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    Any failure by us to comply with applicable legal and regulatory requirements, or to adjust to changing legal and political environments, could result in fines, penalties, and sanctions; product recalls; suspensions or discontinuations of, or limitations or restrictions on, our ability to design, manufacture, market, import, export or sell our products; and damage to our reputation. Any of these could negatively impact our business. Our success is heavily dependent on our continued proprietary product and service innovation We believe our future success significantly depends on our ability to continue, on a cost-effective and timely basis, to enhance our existing proprietary product and service offerings and to develop and introduce new and innovative proprietary products and services. As a result, we invest substantial funds and efforts into R&D, investigating new products and technologies being developed by third parties and obtaining certain such new products and technologies through licenses or acquisitions. There can be no assurance that our R&D, licensing, or acquisition efforts will achieve expected results, when or whether any of our products or services now under development will be launched, or whether we may be able to develop, license or otherwise acquire new products or technologies. We also cannot predict whether any product or service offering, once launched, will achieve market acceptance or achieve sales and revenue consistent with our expectations. We rely on a combination of patent, trade secret, trademark, and copyright laws to protect our proprietary rights. We also license patents and technologies from third parties to enable the use of third-party technologies in the development and production of our products and offerings. If we do not have adequate protection of our proprietary rights or are unable to license third-party patents and technologies on reasonable terms, our business may be adversely affected by competitors who utilize substantially equivalent technologies that compete with us. We cannot ensure that we will obtain issued patents, that any patents issued or licensed to us will remain valid, or that any patents owned or licensed by us will provide protection against competitors with similar technologies. Even if our patents cover products sold by our competitors, the time and expense of litigating to enforce our patent rights could be substantial and could have an adverse effect on our results of operations. In addition, expiration of patent rights could result in substantial new competition in the markets for products previously covered by those patent rights. In the past, we have received notices claiming that our products infringe third-party patents and we may receive such notices in the future. Patent litigation is complex and expensive, and the outcome of patent litigation can be difficult to predict. We cannot ensure that we will win a patent litigation case or negotiate an acceptable resolution of such a case. If we lose, we may be prohibited from selling certain products and/or we may be required to pay damages and/or ongoing royalties as a result of the lawsuit. Any such result could have an adverse effect on our results of operations. Increased competition from and technological advances by our competitors could negatively affect our operating results We face intense competition within the markets in which we sell our products and services, and we expect that future competition will become even more intense as new products, services and technologies become available and new competitors enter the market. Our competitors in the veterinary diagnostic market in the United States and abroad include companies that develop, manufacture, and sell veterinary diagnostic tests and commercial veterinary reference laboratories, certain large and well-funded animal health pharmaceutical companies, as well as corporate hospital chains that operate reference laboratories that serve both their hospitals and unaffiliated hospitals, such as VCA Inc., which is wholly owned by Mars, Incorporated, another operator of corporate hospital chains. Consolidation among our competitors and our customers may intensify the competition we face. While we believe that our offerings are competitively differentiated due to our proprietary products and services (such as the IDEXX SDMA test and VetConnect Plus) that offer an integrated, comprehensive diagnostic solution and the quality of our technical and customer service, there can be no assurance that increased consolidation among our competitors or customers (as well as any resulting reference laboratory vertical integration among our customers) would not have a negative impact on our ability to compete successfully. For more information regarding the risks presented by consolidation and reference laboratory vertical integration among our customers, see “Consolidation in our customer base, including through increased corporate hospital ownership, and prevalence of buying consortiums could negatively affect our business” below. Competition could negatively affect our sales and profitability in a number of ways. New competitors may enter our markets through the development of innovative new technology, the acquisition of rights to use existing technologies or the use of existing technologies when patents protecting such existing technologies expire. New or existing competitors may introduce new, innovative, and competitive products and services, which could be superior, or be perceived by our customers to be superior, to our products and services or lead to the obsolescence of one or more of our products or services. Business combinations and mergers among our competitors may result in competitors that are better positioned to create, market, and sell 21


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    more compelling product and service offerings. While an important aspect of our strategy is to continue, on a cost-effective and timely basis, to enhance our existing products and services and to develop and introduce new and innovative products and services, there can be no assurance that we will be able to successfully develop such products and services or that those products or services will be superior to our competitors’ products or services or otherwise achieve market acceptance. Some of our competitors and potential competitors may choose to differentiate themselves by offering products and services perceived in the eyes of customers as similar, at substantially lower sales prices, which could have an adverse effect on our results of operations through loss of market share or a decision to lower our own sales prices to remain competitive. In addition, our ability to attract and retain customers depends on the effectiveness of our customer marketing and incentive programs and multiple competitors could bundle product and service offerings through co-marketing or other arrangements, which could enhance their ability to compete with our broad product and service offering. Certain of our competitors and potential competitors, including large diagnostic and pharmaceutical companies, also have substantially greater financial and managerial resources than us, as well as greater experience in manufacturing, marketing, research and development, and obtaining regulatory approvals than we do. Consolidation in our customer base, including through increased corporate hospital ownership, and prevalence of buying consortiums could negatively affect our business Veterinarians are our primary customers for our CAG products and services, and the veterinary services industry in the U.S. and abroad has been consolidating at an accelerating rate in recent years. In the United States, the number of owners of veterinary hospitals has been declining, and an increasing percentage of veterinary hospitals are owned by corporations that are in the business of acquiring veterinary hospitals and/or opening new veterinary hospitals nationally or regionally. Major corporate hospital owners in the U.S. include Mars, Incorporated (owner of Banfield Pet Hospitals, Blue Pearl Veterinary Partners, Pet Partners and VCA Inc.), and National Veterinary Associates, and are joined by dozens of smaller consolidators. A similar trend exists in other regions such as Canada, Europe, Australia, New Zealand, China, and Brazil. Furthermore, an increasing percentage of individually-owned veterinary hospitals in the U.S. are participating in buying consortiums. Corporate owners of veterinary hospitals and buying consortiums often seek to improve profitability by leveraging the buying power they derive from their scale to obtain favorable pricing from suppliers, which could have a negative impact on our profitability and results of operations. While we have strong supplier relationships with several corporate hospital groups and buying consortiums, decisions by larger corporate owners and buying consortiums to shift their purchasing of products and services away from us and to a competitor would have a negative impact on our results of operations. In addition, certain corporate owners also operate reference laboratories that serve both their hospitals and unaffiliated hospitals. Any hospitals acquired by these companies generally attempt to shift all or a large portion of their testing to the reference laboratories operated by these companies, and there can be no assurance that hospitals that otherwise become affiliated with these companies would not shift all or a portion of their testing to such reference laboratories. Furthermore, because these companies compete with us in the reference laboratory services marketplace, hospitals acquired by these companies or those that establish other affiliations with these companies may cease to be customers or potential customers of our other companion animal products and services, which would cause our sales of these products and services to decline. Changes in testing patterns could negatively affect our operating results The market for our companion animal, livestock and poultry diagnostic tests and our dairy and water testing products could be negatively impacted by a number of factors impacting testing practices. The introduction or broad market acceptance of vaccines or preventatives for the diseases and conditions for which we sell diagnostic tests and services could result in a decline in testing. Changes in accepted medical protocols regarding the diagnosis of certain diseases and conditions could have a similar effect. Eradication or substantial declines in the prevalence of certain diseases also could lead to a decline in diagnostic testing for such diseases. Our livestock and poultry products business in particular is subject to fluctuations resulting from changes in disease prevalence. The outbreak of certain diseases (such as African swine fever) among livestock or poultry, or the adverse impact of climate change-related events (such as hurricanes, earthquakes, fires, and floods), could lead to the widespread death or precautionary destruction of such animals in the affected regions, reducing herd or flock sizes, which could reduce the demand for our testing products for such animals. Changes in government regulations or in the availability of government funds available for monitoring programs could negatively affect sales of our products that are driven by compliance testing, such as our livestock and poultry, dairy and water products. In addition, changes and trends in local dairy, poultry, or other food markets around the world could negatively affect the related production markets resulting in a decline in demand for our testing products. Weakened economic conditions caused by the effects of the ongoing COVID-19 pandemic have reduced, and may further reduce, demand for our water testing products, livestock and poultry diagnostic tests and dairy products, and COVID-19-related social distancing procedures and guidelines, including stay-at-home orders that may be further deployed to combat the spread of COVID-19, and possible higher infection rates could result in a decrease in companion animal clinical visits, the delay of elective procedures and wellness visits and disruption of veterinary clinic operations, all of which 22


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    would have a negative effect on veterinary service providers and result in declines in demand for our CAG products and services. Declines in testing for any reason, including the reasons described above, along with lost opportunities associated with a reduction in veterinary visits, could have an adverse effect on our results of operations. We sell many products through distributors, which presents risks that could negatively affect our operating results Some of our product sales in international markets occur through third-party distributors. As a result, we are dependent on these distributors to promote and create demand for our products. Our distributors often offer products from several different companies, including our competitors, and may promote our competitors’ products over our own products. We have limited ability, if any, to cause our distributors to devote adequate resources to promoting, marketing, selling, and supporting our products or to maintain certain inventory levels, and changes in our distributors’ inventory levels, as compared to comparable prior periods, could negatively impact our revenue growth rates. We cannot assure you that we will be successful in maintaining and strengthening our relationships with our distributors or establishing relationships with new distributors who have the ability to market, sell and support our products effectively. We may rely on one or more key distributors for a product or a region, and the loss of these distributors could reduce our revenue. Distributors may face financial difficulties, including bankruptcy, which could harm our collection of accounts receivable and financial results. While we maintain a rigorous distribution compliance program, violations of anti-corruption or similar laws by our distributors could have a material impact on our business and reputation, and any termination of a distributor relationship may result in increased competition in the applicable jurisdiction. Failure to manage the risks associated with our use of distributors outside of the U.S. may reduce sales, increase expenses, and weaken our competitive position, any of which could have a negative effect on our operating results. Our limited experience and small scale in the human point-of-care and laboratory diagnostics market could inhibit our success in this market We have limited experience in the human point-of-care and laboratory medical diagnostics market and we operate at a small scale in this market. This market differs in many respects from the veterinary diagnostic market. Significant differences include the impact of third-party reimbursement on diagnostic testing, more extensive regulation, greater product liability risks, larger competitors, a more segmented customer base and more rapid technological innovation. Our limited experience and small scale in the human point-of-care and laboratory medical diagnostics market could negatively affect our ability to successfully manage the risks and features of this market that differ from the veterinary diagnostic market. There can be no assurance that we will be successful in achieving growth and profitability in the human point-of-care and laboratory medical diagnostics market comparable to the results we have achieved in the veterinary diagnostic market. GENERAL RISKS We depend on key leadership and talent to succeed and compete effectively Our continued success is substantially dependent on our ability to attract, develop, and retain highly capable and skilled senior leadership and other key personnel. As we continue to grow our business, expand our geographic scope, and develop and offer innovative, new products and services, we require the organizational talent necessary to ensure effective succession for our senior leadership and other key personnel. Competition for experienced leaders and employees, particularly for persons with specialized skills, can be intense. Our ability to recruit and retain such talent will depend on a number of factors, including compensation and benefits, work location, work environment and development opportunities. The loss of the services of, or our failure to recruit or develop and implement effective succession plans for, our senior leadership or other key personnel may significantly delay or prevent the achievement of our strategic objectives, disrupt our operations, and adversely affect our business and our future success. In addition, even if we effectively develop and implement succession plans and make key leadership transitions, we cannot provide assurances as to whether we may experience management or other challenges in connection with any of those leadership transitions that could adversely affect our future success. We are increasingly dependent on the continuous and reliable operation of our information technology systems, and a disruption of these systems or significant security breaches could adversely affect our business. We rely on our information systems, as well as our third-party business partners’ and suppliers’ information systems, to provide access to our web-based products and services, keep financial records, analyze results of operations, process customer orders, manage inventory, process shipments to customers, store confidential or proprietary information and operate other critical functions. Although we maintain security policies, employ system backup measures and engage in redundancy planning and processes, such policies, measures, planning and processes, as well as our current disaster recovery plans, may be 23


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    ineffective or inadequate to address all eventualities. Further, our information systems and our business partners' and suppliers' information systems may be vulnerable to attacks by hackers and other security breaches, including, among other things, computer viruses and malware, denial of service actions, misappropriation of data and similar events through the internet (including via devices and applications connected to the internet), and through email attachments and persons with access to these information systems, such as our employees or third parties with whom we do business. Due to governmental mandates and recommended safety measures to control the spread of COVID-19, we modified aspects of our business practices. This has resulted in a greater number of our employees working remotely for extended periods of time, which may result in some increased risk of vulnerability or attacks associated with additional individuals accessing our data and systems remotely. In addition, security industry experts and government officials have warned about the risks of hackers and cybersecurity attacks targeting U.S. organizations conducting COVID-19 related research, such as IDEXX. As information systems and the use of software and related applications by us, our business partners, suppliers, and customers become more cloud-based and connected to the “Internet of Things,” which is inherently susceptible to cyberattacks, there has been an increase in global cybersecurity vulnerabilities and threats, including more sophisticated and targeted cyber- related attacks that pose a risk to the security of our information systems and networks and the confidentiality, availability and integrity of data and information. We process credit card payments electronically over secure networks and also offer products and services that connect to and are part of the “Internet of Things,” such as our connected devices (e.g., IDEXX VetLab instruments). Any such attack or breach could compromise our networks and the information stored thereon could be accessed, publicly disclosed, lost, or stolen. While we have implemented network security and internal control measures, especially for the purpose of protecting our connected products and services from cyberattacks, and invested in our data and information technology infrastructure, there can be no assurance that these efforts will prevent a system disruption, attack, or security breach and, as such, the risk of system disruptions and security breaches from a cyberattack remains. We, and some of our third party vendors, have experienced cybersecurity attacks in the past and may experience further attacks in the future, potentially with more frequency. To our knowledge, most of these attacks have been unsuccessful, and none have resulted in any material adverse impact to our business or operations. We have adopted measures to mitigate potential risks associated with information technology disruptions and cybersecurity threats; however, given the unpredictability of the timing, nature and scope of such disruptions and the evolving nature of cybersecurity threats, which vary in technique and sources, if we or our business partners or suppliers were to experience a system disruption, attack or security breach that impacts any of our critical functions, or our customers were to experience a system disruption, attack or security breach via any of our connected products and services, we could potentially be subject to production downtimes, operational delays, other detrimental impacts on our operations or ability to provide products and services to our customers, the compromising of confidential or otherwise protected information, destruction or corruption of data, security breaches, other manipulation or improper use of our systems or networks, financial losses and additional costs from remedial actions, repairs to infrastructure, physical systems or data processing systems, increased cybersecurity and information technology protection costs, loss of business or potential liability, and/or damage to our reputation, any of which could have a material adverse effect on our competitive position, results of operations, cash flows or financial condition. Our customers could also face negative consequences such as the compromises of sensitive or critical information or systems. Furthermore, any access to, public disclosure of, or other loss of data or information (including any of our confidential or proprietary information or personal data or information) as a result of an attack or security breach could result in governmental actions or private claims or proceedings, which could damage our reputation, cause a loss of confidence in our products and services, damage our ability to develop (and protect our rights to) our proprietary technologies and have a material adverse effect on our business, financial condition, results of operations or prospects. For more information regarding data and information privacy and protection risks, see “Our operations and reputation may be impaired if we, our products, or our services do not comply with our global privacy policy or evolving laws and regulations regarding data privacy and protection” below. Factors and events beyond our control, including natural and other disasters and climate change-related events, could disrupt our operations or our supply chain and adversely affect our business Our business and results of operations could be negatively affected by certain factors and events beyond our control, such as natural disasters, severe weather conditions and/or climate change-related events (such as hurricanes, earthquakes, fires, and floods); public health issues (such as outbreaks, epidemics, or pandemics, including the ongoing COVID-19 pandemic); civil unrest; geopolitical conditions and developments (such as the United Kingdom’s exit from the European Union); war, terrorism, or other man-made disasters; increases in wages that drive up prices; the imposition of regulations, trade protection measures, tariffs, duties, import/export restrictions, quotas or embargoes on key components; labor stoppages; transportation failures affecting the supply and shipment of materials and finished goods; the unavailability of raw materials; Any of these events could result in, among other things, damage to or the temporary closure of one or more of our manufacturing or distribution facilities or reference laboratories (damage to one of our facilities or the manufacturing equipment we use could be 24


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    costly and may require substantial lead-time to repair or replace); damage to or closure of one or more facilities of our third- party business partners or suppliers on which we rely; a temporary lack of an adequate work force in one or more markets; an interruption in power supply; a temporary or long-term disruption in our supply chain (including a disruption to our ability to obtain critical components for the manufacture of our products); a temporary disruption in our ability to deliver (or delays in the delivery of) our products or services; and short- or long-term damage to our customers’ businesses (which would adversely impact customer demand for our products and services). For more information regarding the risks presented by disruption to our suppliers’ operations and supply chain, see “Our dependence on suppliers could limit our ability to sell certain products or negatively affect our operating results” above. We manufacture many of our significant companion animal products, including our rapid assay devices and certain instruments, many of our water testing products and certain of our livestock, poultry, and dairy testing products, at a single facility in Westbrook, Maine. Certain of our companion animal products, as well as our human point-of-care products, are manufactured in Roswell, Georgia. We also manufacture certain of our livestock and poultry testing products in Bern, Switzerland and Montpellier, France. In addition, we maintain major distribution facilities in North America and in the Netherlands and major reference laboratories in Memphis, Tennessee; Kornwestheim, Germany; Sacramento, California; Elmhurst, Illinois; North Grafton, Massachusetts; East Brisbane, Australia; Markham, Ontario; Wetherby, U.K.; and Tokyo, Japan. Interruption of operations at any of these facilities due to the occurrence of one or more of the events described above could have an adverse effect on our results of operations. While we maintain plans to continue business under such circumstances, there can be no assurance that such plans will be successful in fully or partially mitigating the effects of such events. We also maintain property and business interruption insurance to insure against the financial impact of certain events of this nature. However, this insurance may be insufficient to compensate us for the full amount of any losses that we may incur. In addition, such insurance will not compensate us for potential long-term competitive effects of being out of the market for the period of any interruption in operations. Risks associated with doing business internationally could negatively affect our operating results For the year ended December 31, 2020, approximately 38% of our overall revenue and approximately 90% of our LPD revenue was attributable to sales of products and services to customers outside the U.S. Although we intend to continue to expand our international operations and business, we may not be able to successfully promote, market, import, export, sell or distribute our products and services outside the U.S. Various risks associated with foreign operations may impact our international sales, including, but not limited to, disruptions in transportation of our products or our supply chain; fluctuations in oil prices; increased border protection and restriction on travel; the differing product and service needs of foreign customers; difficulties in building, staffing and managing foreign operations (including a geographically dispersed workforce); differing protection of intellectual property; trade protection measures, quotas, embargoes, import/export restrictions, tariffs, duties, and regulatory and licensing requirements; natural and other disasters; public health issues (such as outbreaks, epidemics, the ongoing COVID-19 pandemic, or the prospect of a pandemic); ongoing instability or changes in a country’s or region’s regulatory, economic or political conditions, including as a result of the United Kingdom’s exit from the European Union; other unfavorable geopolitical conditions; security concerns; and local business and cultural factors that differ from our normal standards and practices, including business practices prohibited by the Foreign Corrupt Practices Act and other anti-corruption laws and regulations. In addition, to market and sell many of our products outside the U.S., we are subject to product approval and registration requirements that often require us to provide confidential, proprietary information about those products to foreign regulatory agencies. There can be no assurance that the confidential, proprietary information provided to foreign regulatory agencies to comply with product approval and registration requirements may not be accessed by unauthorized persons or otherwise stolen, which could negatively affect our ability to protect our proprietary rights in our innovative products and our future success. We also may forgo marketing and selling some of our products in certain foreign jurisdictions due to the risk of intellectual property theft, which could negatively affect our ability to expand our international operations and business. For more information about the risks related to the protection of our proprietary rights in our products and services, see "Our success is heavily dependent on our continued proprietary product and service innovation" below. Further, prices that we charge to foreign customers may be different than the prices we charge for the same products in the U.S. due to competitive, market or other factors, or changes in foreign currency exchange rates. Our results of operations are also susceptible to changes in foreign currency exchange rates. As a result, the mix of domestic and international sales in a particular period could have an adverse impact on our results of operations for that period. 25


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    Our operations and reputation may be impaired if we, our products, or our services do not comply with our global privacy policy or evolving laws and regulations regarding data privacy and protection The nature of our business involves the receipt, storage and use of information, including personal data, about our customers, pet owners, suppliers, and employees. We collect and use personal data in a variety of ways. We offer products and services that collect and use personal data, including veterinary practice management systems, online customer communication tools and services, VetConnect PLUS, and two-way integration technology. Some of these products and services rely on third- party providers for cloud storage. We also engage in e-commerce through various websites and collect contact and other personal data from our customers and website visitors. In addition, we transfer information, including personal data, among IDEXX, our subsidiaries and third parties with which we have commercial relations for business purposes. Our collection, protection, security, retention, storage, disclosure, sharing and use of personal data described above are subject to expanding and increasingly complex laws and regulations in the U.S. and abroad. In addition, these laws and regulations continue to develop and are subject to frequent revisions (and generally have become more stringent over time), are subject to differing interpretations, may be applied inconsistently from jurisdiction to jurisdiction and may be inconsistent with our current global privacy policy and data protection practices. Compliance with these evolving requirements can be costly, require us to change our business practices in a manner adverse to our business or delay or impede the development and offering of innovative products and services. Additionally, public perception and standards related to the privacy of personal data can shift rapidly, in ways that may affect our reputation or influence regulators in the U.S. and abroad to expand or adopt more stringent regulations and laws. Examples of laws and regulations that have impacted or could impact our business include: • The California Consumer Privacy Act (“CCPA”), which became effective in January 2020, gives California residents, among other things, expanded rights to access and delete their personal information, opt out of certain personal information sharing, and receive detailed information about how their personal information is used. The CCPA provides for civil penalties for violations, as well as a private right of action for data breaches. Moreover, a new privacy law, the California Privacy Rights Act, which is scheduled to take effect on January 1, 2023 (with a lookback to January 1, 2022), will significantly modify the CCPA, and will impose additional data protection obligations on companies such as ours doing business in California. Similar laws have been proposed in other states and at the federal level, and if passed, such laws may have potentially conflicting requirements that would make compliance challenging. The effects of the CCPA and other similar laws may require us to modify our data processing practices and policies and to incur substantial costs and expenses to comply. • The European Union's General Data Protection Regulation ("GDPR"), which became effective in May 2018, imposes stringent operational requirements for controllers and processors of personal data of individuals in the EEA, and noncompliance can trigger fines of up to the greater of €20 million or 4% of global annual revenues. • In July 2020, the Court of Justice of the European Union invalidated the EU-U.S. and Swiss-U.S. Privacy Shields calling into question data transfers carried out under the European Commission's Standard Contractual Clauses, which has created compliance challenges for our transfer of personal data from the EEA, UK and/or Switzerland to the U.S. and other third countries. Similar laws have been proposed or passed in other countries, which may create additional compliance challenges for cross-border transfers of personal data. • Following the United Kingdom’s withdrawal from the EEA and the EU on December 31, 2020, we became subject to the GDPR as incorporated into the United Kingdom law, and noncompliance can trigger fines of up to the greater of £17.5 million or 4% of global turnover. In addition, because the European Commission has not yet made an adequacy determination regarding the United Kingdom's data privacy protection, lawful transfers of personal data between these jurisdictions remain unclear. The Brexit Trade and Cooperation Agreement (TCA) has established a four- to six-month grace period during which transfers of personal data from the EU to the UK can continue without additional safeguards, provided that the UK maintains its pre-TCA data protection laws. During this time, the European Commission may adopt a UK adequacy decision which organizations can then rely on for EU to UK personal data transfers but, if no UK adequacy decision is adopted, the UK will be considered a third country at the end of the grace period and we will be required to implement additional safeguards for personal data transfers. • The Brazilian General Data Protection Law (“LGPD”), which became effective in September 2020, and the South African Protection of Personal Information Act, which became effective in July 2020 (with a one-year grace period until June 30, 2021), are examples of other non-U.S. data privacy-related laws to which we are subject. While we have policies and procedures in place to comply with all applicable privacy-related laws and regulations (including the GDPR, CCPA and LGPD), as well as our contractual obligations, any failure or perceived failure by us, the third 26


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    parties with whom we work or our products and services to so comply could result in damage to our reputation or legal proceedings or actions against us by governmental entities or others, any of which could have an adverse effect on our business. In addition, concerns about our practices with regard to the collection, use, retention, disclosure, or security of personal data or other privacy-related matters, even if unfounded and even if we are in compliance with applicable laws and regulations, could damage our reputation and harm our business. Future operating results could be negatively affected by changes in tax rates, the adoption of new U.S. or international tax legislation or exposure to additional tax liabilities The nature of our global operations subjects us to local, state, regional and federal tax laws in jurisdictions around the world. Our future tax expense could be affected by changes in the mix of earnings in countries with differing statutory tax rates, changes in the valuation of deferred tax assets and liabilities or changes in tax laws or their interpretation. Additionally, tax rules governing cross-border activities are continually subject to modification as a result of both coordinated actions by governments and unilateral measures designed by individual countries, both intended to tackle concerns over base erosion and profit shifting ("BEPS") and perceived international tax avoidance techniques. We have received a tax ruling from the Netherlands that documents our mutual understanding of how existing tax laws apply to our circumstances. This ruling expires as of December 31, 2022, and we have been informed that it will not be renewed due to changes to the advance ruling policy in the Netherlands. While the absence of an advance agreement does not preclude our ability to continue to apply existing tax laws in the same manner as allowed by the existing ruling, the lack of such agreement creates uncertainty as to our future tax rate. Further, the Netherlands has recently announced proposals to modify existing rules that, if enacted, could eliminate the benefits to which this ruling applies. We continue to consider these developments within our overall tax strategy. Additionally, the European Commission has opened formal investigations into specific tax rulings granted by several countries to specific taxpayers and several are in various stages of litigation. While we believe that our rulings are different than those being discussed, the ultimate resolution of such activities cannot be predicted and could also have an adverse impact on future operating results. Our income tax filings are regularly under audit by various tax authorities, and the final determination of tax audits could be materially different from that which is reflected in historical income tax provisions and accruals. Significant judgment is required in determining our worldwide provision for income taxes. We regularly assess our exposures related to our worldwide provision for income taxes to determine the adequacy of our provision for taxes. Any reduction in these contingent liabilities or additional assessments would increase or decrease income, respectively, in the period such determination is made. A weak worldwide economy could result in reduced demand for our products and services or increased customer credit risk A substantial percentage of our sales are made worldwide to the companion animal veterinary market. Demand for our companion animal diagnostic products and services is driven in part by the number of patient visits to veterinary hospitals and the practices of veterinarians with respect to the recommendations for diagnostic testing, as well as pet owner compliance with these recommendations. Pet owners generally pay cash out of pocket for health care services for their pets from veterinary practices. The ongoing COVID-19 global pandemic has increased economic uncertainty and caused economic slowdowns that may continue or recur. Economic weakness in our significant markets could cause pet owners to forgo or defer visits to veterinary hospitals or affect their willingness to approve certain diagnostic tests, comply with a treatment plan or, even more fundamentally, continue to own a pet. In addition, concerns about the financial resources of pet owners could cause veterinarians to be less likely to recommend certain diagnostic tests, and concerns about the economy may cause veterinarians to defer purchasing capital items such as our instruments and systems. These conditions, if they continue, could result in a decrease in sales or decrease in sales growth, of diagnostic products and services, which could have an adverse effect on our results of operations. Demand for our water products is driven in part by the availability of funds at government laboratories, water utilities and private certified laboratories that utilize our products. Availability of funds also affects demand by government laboratories and cattle, swine and poultry producers that utilize our livestock and poultry diagnostic products, and by users of our human diagnostic products and services. Economic weakness in our markets related to the ongoing COVID-19 global pandemic has caused and could continue to cause our customers to reduce their investment in such testing, which could have an adverse effect on our results of operations. 27


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    In all of our markets, a weak economy may also cause deterioration in the financial condition of our distributors and customers, which could inhibit their ability to pay us amounts owed for products delivered or services provided in a timely fashion or at all. Strengthening of the rate of exchange for the U.S. dollar has a negative effect on our business We are a global business, with 38% of our revenue during the year ended December 31, 2020, attributable to sales of products and services to customers outside of the U.S. Any strengthening of the rate of exchange for the U.S. dollar against foreign currencies, and in particular the euro, British pound, Canadian dollar, Chinese renminbi, Japanese yen, Australian dollar and Brazilian real, adversely affects our results, as it reduces the dollar value of sales and profits that are made in those currencies. The strengthening of the U.S. dollar has a greater adverse effect on the profits from products manufactured or sourced in U.S. dollars that are exported to international markets and a lesser effect on profits from foreign sourced products and services due to a natural hedge from international expenses denominated in the corresponding foreign currencies. For the year ended December 31, 2020, approximately 21% of our consolidated revenue was derived from products manufactured or sourced in U.S. dollars and sold internationally in local currencies, as compared to 22% for both years ended December 31, 2019 and 2018. A strengthening U.S. dollar could also negatively impact the ability of customers outside the U.S. to pay for purchases denominated in U.S. dollars as well as affect our overall competitiveness in international markets. The accumulated impacts from any continued, longer-term growth in the value of the U.S. dollar against foreign currencies may have a material adverse effect on our operating results. See “Part II, Item 7A. Quantitative and Qualitative Disclosures About Market Risk” included in this Annual Report on Form 10-K for additional information regarding currency impact. In addition, there has been, and may continue to be, volatility in currency exchange rates as a result of the United Kingdom’s withdrawal from the European Union, especially between the U.S. dollar and the British pound. Our foreign currency hedging activities (see "Part II, Item 8. Financial Statements and Supplementary Data, Note 19. Hedging Instruments" in the accompanying Notes to consolidated financial statements), which are designed to minimize and delay, but not to eliminate, the effects of foreign currency fluctuations, may not sufficiently offset the adverse financial effect of unfavorable movements in foreign exchange rates on our financial results over the limited time the hedges are in place. In addition, our hedging activities involve costs and risks, such as transactions costs and the risk that our hedging counterparties will default on their obligations. We primarily hedge intercompany product purchases and sales denominated in the euro, British pound, Canadian dollar, Japanese yen, and Australian dollar. Other foreign currency exposures related to foreign sourced services and emerging markets may not be practical to hedge. In certain cases, these exposures are not offset by foreign currency denominated costs. As we primarily use foreign currency exchange contracts with durations of less than 24 months and enter into contracts to hedge incremental portions of anticipated foreign currency transactions on a quarterly basis for the current and following year, the effectiveness of our foreign currency hedging activities to offset longer-term appreciation in the value of the U.S. dollar against non-U.S. currencies may be limited. Factors that could affect the effectiveness of our hedging activities include accuracy of sales and other forecasts, volatility of currency markets, and the cost and availability of hedging instruments. Since our hedging activities are designed to minimize volatility, they not only temporarily reduce the negative impact of a stronger U.S. dollar, but they also temporarily reduce the positive impact of a weaker U.S. dollar. Our future financial results could be significantly affected by a strengthening value of the U.S. dollar in relation to the foreign currencies in which we conduct business. The degree to which our financial results are affected for any given time period will depend in part upon our hedging activities. Restrictions in our debt agreements or our inability to obtain financing on favorable terms may increase our cost of borrowing and limit our activities Our ability to make scheduled payments and satisfy our other obligations under our Credit Facility and senior notes depends on our future operating performance and on economic, financial, competitive, and other factors beyond our control. Our business may not generate sufficient cash flows to meet these obligations or generate sufficient levels of earnings to satisfy the applicable affirmative, negative, and financial covenants. Our failure to comply with these covenants and the other terms of the Credit Facility and senior notes could result in an event of default and acceleration of our obligations under these agreements, which may require us to seek additional financing or restructure existing debt on unfavorable terms. In addition, adverse changes in credit markets could increase our cost of borrowing and make it more difficult for us to obtain financing, which could limit our ability to execute certain strategies and have an adverse effect on our revenue growth and profitability. 28


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    Our senior notes include provisions which stipulate a prepayment penalty for which we will be obligated in the event that we elect to repay the notes prior to their stated maturity dates. Should we elect to repay some or all of the outstanding principal balance on our senior notes, the prepayment penalty we incur could adversely affect our results of operations and cash flows. We fund our operations, capital purchase requirements and strategic growth needs through cash on hand, funds generated from operations, amounts available under our Credit Facility and senior note financings. If we are unable to obtain financing on favorable terms, we could face restrictions that would limit our ability to execute certain strategies, which could have an adverse effect on our revenue growth and profitability. Borrowings under our Credit Facility bear interest at variable rates, including rates based on the London Interbank Offered Rate (LIBOR), exposing us to interest rate risk. If interest rates were to increase, our debt service obligations under our variable-rate Credit Facility would increase even if the principal amount borrowed remained the same. Our Credit Facility includes a provision for the determination of a benchmark replacement rate as a successor to the LIBOR rate. RISKS RELATED TO AN INVESTMENT IN OUR SECURITIES Fluctuations in our quarterly or annual results may cause our stock price to decline Our prior operating results have fluctuated due to a number of factors, many of which are beyond our control, including seasonality of certain product lines; changes in our accounting estimates; the impact of acquisitions; timing of distributor purchases product launches, operating expenditures, and customer marketing and incentive programs; changes in the number and type of competitors and their product offerings; changes in our sales and distribution model; changes in the economy affecting consumer spending; and other matters. Similarly, our future operating results may vary significantly from quarter to quarter or year to year due to these and other factors. If our operating results or projections of future operating results do not meet the expectations of securities analysts or investors in future periods, our stock price may fall. The market price of our common stock may be highly volatile, and you may not be able to resell your shares at or above the price you paid The trading price of our common stock may be volatile. Securities markets worldwide experience significant price and volume fluctuations. This market volatility, as well as other general economic, market or political conditions, could reduce the market price of our common stock rapidly and unexpectedly, in spite of our operating performance. Factors that may impact the market price of our common stock include the factors described in this “Risk Factors” section and elsewhere in this Form 10-K, as well as: • Our stock repurchase program and changes in our capital structure, including the issuance of additional debt; • Public announcements (including the timing of these announcements) regarding our business, financial performance and prospects or new products or services, product enhancements or technological advances by our competitors or us; • Trading activity in our stock, including portfolio transactions in our stock by us, our executive officers and directors, and significant stockholders; trading activity that results from the ordinary course rebalancing of stock indices in which we may be included, such as the S&P 500 Index; trading activity related to our inclusion in, or removal from, any stock indices; and short-interest in our common stock, which could be significant from time to time; • Investor perception of us and the industry and markets in which we operate, including changes in earnings estimates or buy/sell recommendations by securities analysts; and whether or not we meet earnings estimates of securities analysts who follow us; and • General financial, domestic, international, economic, and market conditions, including overall fluctuations in the U.S. equity markets, which may experience extreme volatility that, in some cases, is unrelated or disproportionate to the operating performance of particular companies. 29


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    ITEM 1B. UNRESOLVED STAFF COMMENTS Not applicable. ITEM 2. PROPERTIES Our worldwide headquarters is located in Westbrook, Maine where we engage in manufacturing, research and development, marketing, sales, and general and administrative support functions. Our Hoofddorp, Netherlands location includes distribution, warehousing, and office space. Primary Facility Locations Location Functions Own/Lease Westbrook, Maine United States Headquarters Own Hoofddorp, Netherlands European Headquarters Lease Memphis, Tennessee Distribution Center and Reference Lab Lease Kornwestheim, Germany Reference Lab Own Wetherby, United Kingdom Reference Lab Lease Newmarket, United Kingdom Water manufacturing Lease Bern, Switzerland LPD manufacturing Lease Montpellier, France LPD manufacturing Lease Roswell, Georgia OPTI Medical manufacturing Lease Including the locations above, we have over 50 reference laboratories throughout the United States and over 25 reference laboratories internationally, including locations in Europe, Canada, Australia, New Zealand, Brazil, Asia, and South Africa. The majority of our reference laboratories are leased, with the remainder being owned. We also lease space in various locations worldwide for administrative support, manufacturing, sales, distribution, and storage. We believe that our leased and owned properties are generally in good condition, are well-maintained, and are generally suitable and adequate to carry on our business. A detailed listing of all our locations can be found on our website. ITEM 3. LEGAL PROCEEDINGS Due to the nature of our activities, we are at times subject to pending and threatened legal actions that arise out of the ordinary course of business. In the opinion of management, based in part upon advice of legal counsel, the disposition of any such currently pending or threatened matters is not expected to have a material effect on our results of operations, financial condition, or cash flows. However, the results of legal actions cannot be predicted with certainty. Therefore, it is possible that our results of operations, financial condition or cash flows could be materially adversely affected in any particular period by the unfavorable resolution of one or more legal actions. ITEM 4. MINE SAFETY DISCLOSURES Not applicable. 30


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    PART II ITEM 5. MARKET FOR THE REGISTRANT’S COMMON EQUITY, RELATED STOCKHOLDER MATTERS AND ISSUER PURCHASES OF EQUITY SECURITIES Market Information Our common stock is quoted on the NASDAQ Global Select Market under the symbol IDXX. Holders of Common Stock As of February 9, 2021, there were 395 holders of record of our common stock. Because the majority of our common stock is held by brokers and other institutions on behalf of stockholders, we are unable to estimate the total number of stockholders represented by these record holders. Purchases of Equity Securities by the Issuer During the three months ended December 31, 2020, we repurchased shares of common stock as described below: Total Number of Maximum Number Shares Purchased of Shares that May as Part of Publicly Yet Be Purchased Total Number of Average Price Paid Announced Plans Under the Plans or Shares Purchased per Share or Programs (1) Programs (1) Period (a) (b) (c) (d) 𝅺 October 1, 2020 to October 31, 2020 — $ — — 6,275,912 November 1, 2020 to November 30, 2020 26,120 $ 424.82 — 6,275,912 December 1, 2020 to December 31, 2020 1,004 $ 476.53 — 6,275,912 Total 27,124 (2) $ 426.73 — 6,275,912 (1) As of December 31, 2020, our Board of Directors had approved the repurchase of up to 73 million shares of our common stock in the open market or in negotiated transactions pursuant to the Company’s share repurchase program. The program was approved and announced on August 13, 1999, and the maximum number of shares that may be purchased under the program has been increased by the Board of Directors on numerous occasions. There is no specified expiration date for this repurchase program. There were no other repurchase programs outstanding during the three months ended December 31, 2020, and no repurchase programs expired during the period. (2) During the three months ended December 31, 2020, we received 27,124 shares of our common stock that were surrendered by employees in payment for the required withholding taxes due on the vesting of restricted stock units and settlement of deferred stock units. In the above table, these shares are included in columns (a) and (b) but excluded from columns (c) and (d). These shares do not reduce the number of shares that may yet be purchased under the repurchase program. During the year ended December 31, 2020, we repurchased approximately 0.7 million shares of our common stock in transactions made pursuant to our repurchase program and received approximately 0.06 million shares of common stock that were surrendered by employees in payment for the minimum required withholding taxes due on the vesting of restricted stock units and settlement of deferred stock units. Due to the uncertainty of the duration and magnitude of the COVID-19 pandemic and its impacts during 2020, we suspended our open market share repurchase activity beginning in the first quarter of 2020. The existing share repurchase program continues to be authorized by our Board of Directors and we have resumed share repurchases during the first quarter of 2021. See "Part II, Item 8. Financial Statements and Supplementary Data, Note 20. Repurchases of Common Stock" to the consolidated financial statements for the year ended December 31, 2020, included in this Annual Report on Form 10-K for further information. 31


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    Dividends We have never declared or paid any cash dividends on our common stock. From time to time our Board of Directors may consider the declaration of a dividend. However, we have no intention to declare or pay a dividend at this time. Stock Performance This graph compares our total stockholder returns, the Total Return for the Standard & Poor’s (“S&P”) 500 Index, the Total Return for the S&P 500 Health Care Index, and the Total Return for the NASDAQ Stock Market Index (U.S. Companies) (the “NASDAQ Index”) prepared by the Center for Research in Security Prices. This graph assumes the investment of $100 on December 31, 2015, in IDEXX’s common stock, the S&P 500 Index, the S&P 500 Health Care Index, and the NASDAQ Index and assumes dividends, if any, are reinvested. Measurement points are the last trading days of the years ended December 2015 to 2020. 𝅺 12/31/2015 12/31/2016 12/31/2017 12/31/2018 12/31/2019 12/31/2020 𝅺 IDEXX Laboratories, Inc. $100.00 $160.82 $214.45 $255.10 $358.10 $685.50 NASDAQ Index $100.00 $108.87 $141.13 $137.12 $187.44 $271.64 S&P 500 Index $100.00 $111.96 $136.40 $130.42 $171.49 $203.04 S&P 500 Health Care Index $100.00 $97.31 $118.79 $126.47 $152.81 $173.36 ITEM 6. SELECTED FINANCIAL DATA The Company has applied the amendment to Regulation S-K Item 301 which became effective on February 10, 2021. 32


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    ITEM 7. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS The following discussion and analysis of our financial condition and results of operations should be read in conjunction with the consolidated financial statements and related notes appearing elsewhere in this Annual Report on Form 10‑K. The discussion of our financial condition and results of operations and liquidity and capital resources for the year ended December 31, 2018, is included in our Annual Report on Form 10-K for the year ended December 31, 2019, within Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations, and is incorporated by reference herein. We have included certain terms and abbreviations used throughout this Annual Report on Form 10-K in the "Glossary of Terms and Selected Abbreviations.” Description of Business Segments. We operate primarily through three business segments: diagnostic and information management-based products and services for the veterinary market, which we refer to as the Companion Animal Group (“CAG”); water quality products (“Water”); and diagnostic products and services for livestock and poultry health and to ensure the quality and safety of milk and improve producer efficiency, which we refer to as Livestock, Poultry and Dairy (“LPD”). Our Other operating segment combines and presents our products and services for the human medical diagnostics market (“OPTI Medical”) with our out-licensing arrangements because they do not meet the quantitative or qualitative thresholds for reportable segments. See "Part II, Item 8. Financial Statements and Supplementary Data, Note 3. Revenue Recognition and Note 17. Segment Reporting" to the consolidated financial statements for the year ended December 31, 2020, included in this Annual Report on Form 10-K for financial information about our segments, including our product and service categories, and our geographic areas. The following is a discussion of the strategic and operating factors that we believe have the most significant effect on the performance of our business. Companion Animal Group Our strategy is to provide veterinarians with both the highest quality diagnostic information to support more advanced medical care and information management solutions that help demonstrate the value of diagnostics to pet owners and enable efficient practice management. By doing so, we are able to build a mutually successful relationship with our veterinarian customers based on healthy pets, loyal customers and expanding practice revenues. CAG Diagnostics. We provide diagnostic capabilities that meet veterinarians’ diverse needs through a variety of modalities including in-clinic diagnostic solutions and outside reference laboratory services. Veterinarians that utilize our full line of diagnostic modalities obtain a single view of a patient’s diagnostic results, which allows them to track and evaluate trends and achieve greater medical insight. Our diagnostic capabilities generate both recurring and non-recurring revenues. Revenues related to capital placements of our in-clinic IDEXX VetLab suite of instruments and our SNAP Pro Analyzer are non-recurring in nature in that they are sold to a particular customer only once. Revenues from the associated proprietary IDEXX VetLab consumables, SNAP rapid assay test kits, reference laboratory and consulting services, and extended maintenance agreements and accessories related to our IDEXX VetLab instruments and our SNAP Pro Analyzer are recurring in nature, in that they are regularly purchased by our customers, typically as they perform diagnostic testing as part of ongoing veterinary care services. Our recurring revenues, most prominently IDEXX VetLab consumables and rapid assay test kits, have significantly higher gross margins than those provided by our instrument sales. Therefore, the mix of recurring and non-recurring revenues in a particular period will impact our gross margins. Diagnostic Capital Revenue. Revenues related to the placement of the IDEXX VetLab suite of instruments are non- recurring in nature, in that the customer will buy an instrument once over its respective product life cycle, but will purchase consumables for that instrument on a recurring basis as they use that instrument for testing purposes. During the early stage of an instrument’s life cycle, we derive relatively greater revenues from instrument placements, while consumable sales become relatively more significant in later stages as the installed base of instruments increases and instrument placement revenues begin to decline. In the early stage of an instrument’s life cycle, placements are made primarily through sales transactions. As the market for the product matures, an increasing percentage of placements are made in transactions, sometimes referred to as volume commitments, such as our IDEXX 360 program, or reagent rentals, in which instruments are placed at customer sites at little or no cost in exchange for a multi-year customer commitment to purchase recurring products and services. 33


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    We place our Catalyst chemistry analyzers and VetTest instruments through sales, leases, rental, and other programs. As of December 31, 2020, our Catalyst and VetTest chemistry analyzers provided for a combined active installed base of approximately 59,600 units globally, as compared to approximately 56,200 units in 2019 and approximately 50,800 units in 2018. As of December 31, 2020, our premium Catalyst chemistry analyzers provided for an active installed base of approximately 49,600 units globally, as compared to approximately 43,900 units in 2019 and approximately 37,000 units in 2018. A majority of our Catalyst chemistry analyzer placements were to customers that are new to IDEXX, including customers who had been using instruments from one of our competitors, sometimes referred to as competitive accounts. Generally, placement of an instrument with a new or competitive account has the highest economic value as the entire consumable stream associated with that placement represents incremental recurring revenue, whereas the consumable stream associated with a Catalyst placement at a VetTest customer substitutes a Catalyst consumable stream for a VetTest consumable stream. We have found that the consumables revenues increase when a customer upgrades from a VetTest analyzer to a Catalyst analyzer due to the superior test menu capability, flexibility, and ease of use of the Catalyst analyzers, which leads to additional testing by the customer. As we continue to experience growth in placements of Catalyst analyzers and in sales of related consumables, we expect this growth to be partly offset by a decline in placements of VetTest analyzers and in sales of related consumables. We place our ProCyte Dx, LaserCyte Dx and VetAutoread hematology analyzers through multiple sales programs as well. As of December 31, 2020, these hematology analyzers provided for a combined active installed base of approximately 41,200 units, as compared to 38,200 units in 2019 and 35,900 units in 2018. As of December 31, 2020, our premium ProCyte Dx and LaserCyte Dx hematology analyzers provided for an active installed base of approximately 34,600 units globally, as compared to approximately 31,500 units in 2019 and approximately 29,000 units in 2018. A majority of our ProCyte analyzer placements were made to new or competitive accounts. We also continue to place a substantial number of LaserCyte Dx instruments, both new and recertified, as trade-ups from the VetAutoread analyzer and at new and competitive accounts. During 2020, we introduced and began selling our new ProCyte One analyzer and will begin delivery of these analyzers in 2021. As we continue to experience growth in placements of ProCyte analyzers and in sales of related consumables, we expect this growth to be partly offset by a decline in placements of LaserCyte Dx and VetAutoread analyzers and a decrease in the associated recurring revenue stream. As of December 31, 2020, our premium SediVue Dx analyzers provided for an active installed base of nearly10,700 units globally, as compared to approximately 8,900 units in 2019 and approximately 6,600 units in 2018. This instrument and single-use consumable system provides a highly accurate way to automate the process of examining urine under a microscope. We provide customers with SediVue Dx consumables that are charged upon utilization, which we refer to as pay-per-run, as compared to other instruments where we charge upon shipment of consumables. We seek to enhance the attractiveness and customer loyalty of our SNAP rapid assay tests, including by providing the SNAP Pro Analyzer, which activates SNAP tests, properly times the run, captures, and saves images of the results and, in conjunction with IVLS, records invoice charges in the patient record. Our ProRead software interprets results of the SNAP Pro Analyzer. These features promote practice efficiency by eliminating manual entry of test results in patient records and also helps ensure that the services are recorded and accurately invoiced. In addition, SNAP Pro Analyzer results can be shared with pet owners on the SNAP Pro screen or, in conjunction with IVLS, via VetConnect PLUS. We also sell the SNAPshot Dx, which automatically reads certain SNAP test results and, in conjunction with IVLS, records those results in the electronic medical record. We continue to work on enhancing the functionality of our analyzers to read the results of additional tests from our canine and feline family of rapid assay products. Our long-term success in the continuing growth of our CAG recurring diagnostic product and services is dependent upon: growing volumes at existing customers by increasing their utilization of existing and new test offerings, acquiring new customers, maintaining high customer loyalty and retention, and realizing modest annual price increases based on our differentiated products and the growing value of our diagnostic offering. We continuously seek opportunities to enhance the care that veterinary professionals give to their patients and clients through supporting the implementation of real-time care testing work flows, which is performing tests and sharing test results with the client at the time of the patient visit. Our latest generation of chemistry and hematology instruments demonstrates this commitment by offering enhanced ease of use, faster time to results, broader test menu and connectivity to various information technology platforms that enhance the value of the diagnostic information generated by the instruments. In addition, we provide marketing tools and customer support that help drive efficiencies in veterinary practice processes and allow practices to increase the number of clients they see on a daily basis. With all of our instrument product lines, we seek to differentiate our products from our competitors’ products based on time-to-result, ease-of-use, throughput, breadth of diagnostic menu, flexibility of menu selection, accuracy, reliability, ability to handle compromised samples, analytical capability of diagnostics software, integration with the IVLS and VetConnect PLUS, 34


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    client communications capabilities, education and training, and superior sales and customer service. Our success depends, in part, on our ability to differentiate our products in a way that justifies a premium price. Recurring Diagnostic Revenue. Revenues from our proprietary IDEXX VetLab consumable products, our SNAP rapid assay test kits, outside reference laboratory and consulting services, and extended maintenance agreements and accessories related to our CAG Diagnostics instruments are considered recurring in nature. For the year ended December 31, 2020, recurring diagnostic revenue, which is both highly durable and profitable, accounted for approximately 78% of our consolidated revenue. Our in-clinic diagnostic solutions, consisting of our IDEXX VetLab consumable products and SNAP rapid assay test kits, provide real-time reference lab quality diagnostic results for a variety of companion animal diseases and health conditions. Our outside reference laboratories provide veterinarians with the benefits of a more comprehensive list of diagnostic tests and access to consultations with board-certified veterinary specialists and pathologists, combined with the benefit of same-day or next-day turnaround times. We derive substantial revenues and margins from the sale of consumables that are used in IDEXX VetLab instruments and the multi-year consumable revenue stream is significantly more valuable than the placement of the instrument. Our strategy is to increase diagnostic testing within veterinary practices by placing IDEXX VetLab instruments and increasing instrument utilization of consumables. Utilization can increase due to a greater number of patient samples being run or to an increase in the number of tests being run per patient sample. Our strategy is to increase both drivers. To increase utilization, we seek to educate veterinarians about best medical practices that emphasize the importance of chemistry, hematology, and urinalysis testing for a variety of diagnostic purposes, as well as by introducing new testing capabilities that were previously not available to veterinarians. Our in-clinic diagnostic solutions also include SNAP rapid assay tests that address important medical needs for particular diseases prevalent in the companion animal population. We seek to differentiate these tests from those of other in- clinic test providers and reference laboratory diagnostic service providers based on critically important sensitivity and specificity, as demonstrated by peer-reviewed third-party research, as well as overall superior performance and ease of use by providing our customers with combination tests that test a single sample for up to six diseases at once, including the ability to utilize our SNAP Pro Analyzer. We further augment our product development and customer service efforts with sales and marketing programs that enhance medical awareness and understanding regarding certain diseases and the importance of diagnostic testing. We believe approximately half of all diagnostic testing by U.S. veterinarians is provided by outside reference laboratories such as IDEXX Reference Laboratories. In certain markets outside the U.S., the prevalence of in-clinic testing may vary, and a greater or lesser percentage of diagnostic testing may be performed in reference laboratories. We attempt to differentiate our reference laboratory testing services from those of competitive reference laboratories and competitive in-clinic offerings primarily on the basis of a unique and proprietary test menu, technology employed, quality, turnaround time, customer service and tools such as VetConnect PLUS that demonstrate the complementary manner in which our laboratory services work with our in-clinic offerings. Profitability in our lab business is supported, in part, by our expanding business scale globally. Profit improvements also reflect benefits from price increases and our ability to achieve operational efficiencies. When possible, we utilize core reference laboratories to service samples from other states or countries, expanding our customer reach without an associated expansion in our reference laboratory footprint. New laboratories may operate at a loss until testing volumes achieve sufficient scale. Acquired laboratories frequently operate less profitably than our existing laboratories and acquired laboratories may not achieve the profitability of our existing laboratory network for several years until we complete the implementation of operating improvements and efficiencies. Therefore, in the short term, new and acquired reference laboratories generally may have a negative effect on our operating margin. Recurring reference lab revenue growth is achieved both through increased testing volumes with existing customers and through the acquisition of new customers, net of customer losses. We believe the increased number of customer visits by our sales professionals as a result of the growth in our field sales organization has led to increased reference laboratory opportunities with customers who already use one of our in-clinic diagnostic modalities. In recent years, recurring reference laboratory diagnostic and consulting revenues have also been increased through reference laboratory acquisitions, customer list acquisitions, the opening of new reference laboratories, including laboratories that are co-located with large practice customers, and as a result of our up-front customer loyalty programs and our volume commitment programs. Our up-front customer loyalty programs are associated with customer acquisitions and retention and provide incentives to customers in the form of cash 35


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    payments or IDEXX Points upon entering multi-year contractual agreements to purchase annual minimum amounts of products or services, including reference laboratory services. Our volume commitment programs, such as IDEXX 360, provide customers with a free or discounted instrument or system upon entering into multi-year agreements to purchase annual minimum amounts of products and services. Veterinary Software, Services and Diagnostic Imaging Systems. Our portfolio of practice management offerings is designed to serve the full range of customers within the North American, Australian, and European markets. Cornerstone, DVMAX, IDEXX Animana and IDEXX Neo practice management systems provide superior integrated information solutions, backed by exceptional customer support and education. These practice management systems allow the veterinarian to practice better medicine and achieve the practice’s business objectives, including a quality client experience, staff efficiency and practice profitability. We market Cornerstone, DVMAX and IDEXX Neo practice management systems to customers primarily in North America and Australia. We market our IDEXX Animana offering to customers primarily throughout Europe. IDEXX Animana and IDEXX Neo practice management systems are subscription-based SaaS offerings designed to provide flexible pricing and a durable, recurring revenue stream, while utilizing cloud technology instead of a client server platform. While we continue to develop, sell, and support our licensed-based Cornerstone and DVMAX software, we are growing our installed base of subscription-based practice management offerings for new customers of IDEXX practice management systems. We believe that once established, this subscription-based model will provide higher profitability as compared to the historical license-based placements. Our Cornerstone and DVMAX customer base continues to be an important driver of growth through enhanced diagnostic integrations and high value add-on subscription services, such as Pet Health Network Pro, Petly Plans, and credit card processing, and we continue to make investments to enhance the customer experience of all of our license-based software offerings. We also offer rVetLink, a comprehensive referral management solution for specialty care hospitals that streamlines the referral process between primary care and specialty care veterinarians. rVetLink’s cloud technology integrates with major specialty hospital management systems, including Cornerstone Software and DVMAX Software. We differentiate our practice management systems through enhanced functionality, ease of use, and embedded integration with in-clinic IDEXX VetLab instruments and outside reference laboratory test results. Our client communication services create more meaningful pet owner experiences through personalized communication. With our SmartFlow cloud technology, we are able to improve overall patient management through coordination and tracking of every step in a patient workflow. Pet Health Network Pro online client communication and education service complements the entire IDEXX product offering by educating pet owners and building loyalty through engaging the pet owner before, during and after the visit, thereby building client loyalty and driving more patient visits. Our diagnostic imaging systems offer a convenient radiographic solution that provides superior image quality and the ability to share images with clients virtually anywhere. IDEXX imaging software enables enhanced diagnostic features and streamlined integration with our other products and services. Our digital radiography systems, enables low-dose radiation image capture without sacrificing clear, high-quality diagnostic images, reducing the risk posed by excess radiation exposure for veterinary professionals. Placements of imaging systems are important to the growth of revenue streams that are recurring in nature, including extended maintenance agreements and IDEXX Web PACS, which is our cloud-based SaaS offering for viewing, accessing, storing, and sharing multi-modality diagnostic images. We derive relatively higher margins from our subscription-based products. IDEXX Web PACS is integrated with Cornerstone, IDEXX Neo and IDEXX VetConnect PLUS to provide centralized access to diagnostic imaging results alongside patient diagnostic results from any internet connected device. Water Our strategy in the water testing business is to develop, manufacture, market and sell proprietary products that test primarily for the presence of microbial contamination in water matrices, including drinking water supplies, with superior performance, supported by exceptional customer service. Our customers primarily consist of water utilities, government laboratories and private certified laboratories that highly value strong relationships and customer support. We expect that future growth in this business will be partially dependent on our ability to increase international sales. Growth also will be dependent on our ability to enhance and broaden our product line. Most water microbiological testing is driven by regulation, and, in many countries, a test may not be used for compliance testing unless it has been approved by the applicable regulatory body and integrated into customers’ testing protocols. As a result, we maintain an active regulatory program that involves applying for a growing number of regulatory approvals in a number of countries, primarily in Europe. Further, we seek to receive regulatory approvals from governing agencies as a means to differentiate our products from the competition. 36


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    Livestock, Poultry and Dairy We develop, manufacture, market and sell a broad range of tests and perform services for various livestock diseases and conditions, and have active research and development and in-licensing programs in this area. Our strategy is to offer proprietary tests with superior performance characteristics for use in government programs to control or eradicate disease and disease outbreaks and in livestock and poultry producers’ disease, reproductive, and herd health and production management programs. Disease outbreaks are episodic and unpredictable, and certain diseases that are prevalent at one time may be substantially contained or eradicated at a later time. In response to outbreaks, testing initiatives may lead to exceptional demand for certain products in certain periods. Conversely, successful eradication programs may result in significantly decreased demand for certain products. In addition, increases in government funding may lead to increased demand for certain products and budgetary constraints may lead to decreased demand for certain products. As result, the performance in certain sectors of this business can fluctuate. Our strategy in the dairy testing business is to develop, manufacture and sell antibiotic residue and contaminant testing products that satisfy applicable regulatory requirements or dairy processor standards for testing of milk and provide reliable field performance. The manufacture of these testing products leverages the SNAP platform and production assets that also support our rapid assay business, which also leverages the SNAP platform. The dairy SNAP products incorporate customized reagents for antibiotic and contaminant detection. To successfully increase sales of dairy testing products, we believe that we need to increase penetration in dairy processors and develop product line enhancements and extensions. Our Rapid Visual Pregnancy Test for cattle can detect pregnancy 28 days after breeding. This test provides a quick and accurate identifier using whole blood samples. Other OPTI Medical. Our strategy in the OPTI Medical business for the human market is to develop, manufacture, and sell electrolyte and blood gas analyzers, and related consumable products for the medical point-of-care diagnostics market worldwide, with a focus on small to mid-sized hospitals. We seek to differentiate our products based on ease of use, convenience, international distribution and service and instrument reliability. Similar to our veterinary instruments and consumables strategy, a substantial portion of the revenues from this product line is derived from the sale of consumables for use on the installed base of electrolyte and blood gas analyzers. During the early stage of an instrument’s life cycle, relatively greater revenues are derived from instrument placements, while consumable sales become relatively more significant in later stages as the installed base of instruments increases and instrument placement revenues begin to decline. Our long-term success in this area of our business is dependent upon new customer acquisition, customer retention and increased customer utilization of existing and new assays introduced on these instruments. During 2020, we introduced the OPTI SARS-CoV-2 RT-PCR test kit for COVID-19 testing. A significant portion of the growth in our OPTI Medical business was from revenue generated from the test kits and related laboratory services. The future demand for this product is difficult to project given the uncertain nature of the COVID-19 pandemic, including short- term project commitments, available PCR testing capacity, alternative suppliers, and the potential impact of vaccinations and other treatments. Our facility in Roswell, Georgia develops and manufactures the OPTI product lines using the same or similar technology to support the electrolyte needs of the veterinary market. We leverage this facility’s know-how, intellectual property, and manufacturing capability to continue to expand the menu and instrument capability of the VetStat and Catalyst platforms for veterinary applications, while reducing our cost of consumables by leveraging experience and economies of scale. Effective January 1, 2020, we modified our management reporting to the Chief Operating Decision Maker to provide a more comprehensive view of the performance of our operating segments by including costs that were previously not allocated to our segments. Prior to January 1, 2020, certain costs were not allocated to our operating segments and were instead reported under the caption “Unallocated Amounts.” These costs included costs primarily consisting of our R&D function, regional or country expenses and unusual items. Corporate support function costs (such as information technology, facilities, human resources, finance and legal), health benefits and incentive compensation were charged to our business segments at pre- determined budgeted amounts or rates. Beginning January 1, 2020, the segments will reflect these actual costs allocated to the segment based on various allocation methods, including revenue and headcount. Foreign exchange losses on settlements of foreign currency denominated transactions are not allocated to our operating segments and are instead reported within our Other reporting segment. These management reporting changes did not have a material impact to our segment results of operations for the years ended December 31, 2019 and 2018. 37


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    The following tables reflect adjustments to previously reported costs in our Unallocated segment, that are now allocated to our CAG, Water, LPD and Other segments: For the year ended December 31, 2019: (in thousands) CAG Water LPD Other Unallocated Cost of sales $ (247) $ (11) $ (14) $ (6) $ 278 Gross profit 247 11 14 6 (278) Operating Expenses: Sales and marketing $ (239) $ (11) $ (13) $ — $ 263 General and administrative 13,004 501 625 1,363 (15,493) Research and development 16,479 33 41 — (16,553) Total operating expenses 29,244 523 653 1,363 (31,783) Income from operations $ (28,997) $ (512) $ (639) $ (1,357) $ 31,505 For the year ended December 31, 2018: (in thousands) CAG Water LPD Other Unallocated Cost of sales $ (1,540) $ (69) $ (87) $ (35) $ 1,731 Gross profit 1,540 69 87 35 (1,731) Operating Expenses: Sales and marketing $ (574) $ (25) $ (32) $ — $ 631 General and administrative 3,316 66 81 1,145 (4,608) Research and development 15,658 (4) (4) — (15,650) Total operating expenses 18,400 37 45 1,145 (19,627) Income from operations $ (16,860) $ 32 $ 42 $ (1,110) $ 17,896 38


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    The following tables reflect the impact to previously reported segment gross profit margin, operating income margin and operating expenses as a percentage of revenue, due to the allocation of these costs to our CAG, Water, LPD and Other segments: For the year ended December 31, 2019: CAG Water LPD Other Cost of sales —% —% —% —% Gross profit —% —% —% —% Operating Expenses: Sales and marketing —% —% —% —% General and administrative 0.6 % 0.4 % 0.5 % 6.1 % Research and development 0.8 % —% —% —% Total operating expenses 1.4 % 0.4 % 0.5 % 6.1 % Income from operations (1.4)% (0.4)% (0.5)% (6.1)% For the year ended December 31, 2018: CAG Water LPD Other Cost of sales (0.1)% (0.1)% (0.1)% (0.2)% Gross profit 0.1 % 0.1 % 0.1 % 0.2 % Operating Expenses: Sales and marketing —% — % — % —% General and administrative 0.2 % 0.1 % 0.1 % 5.2 % Research and development 0.8 % — % — % —% Total operating expenses 1.0 % — % — % 5.2 % Income from operations (0.9)% — % — % (5.0)% 39


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    CRITICAL ACCOUNTING ESTIMATES AND ASSUMPTIONS The discussion and analysis of our financial condition and results of operations is based upon the consolidated financial statements, which have been prepared in accordance with U.S. GAAP. The preparation of these financial statements requires us to make estimates and judgments that affect the reported amounts of assets, liabilities, revenues and expenses, and related disclosure of contingent assets and liabilities. We evaluate our estimates on an ongoing basis. We base our estimates on historical experience and on various assumptions that we believe to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. Actual results may differ from these estimates. See "Part II, Item 8. Financial Statements and Supplementary Data, Note 2. Summary of Significant Accounting Policies" to the consolidated financial statements included in this Annual Report on Form 10-K for a description of the significant accounting policies used in preparation of these consolidated financial statements. We believe the following critical accounting estimates and assumptions may have a material impact on reported financial condition and operating performance and involve significant levels of judgment to account for highly uncertain matters or are susceptible to significant change. Revenue Recognition See "Part II, Item 8. Financial Statements and Supplementary Data, Note 3. Revenue Recognition" to the consolidated financial statements for the year ended December 31, 2020, included in this Annual Report on Form 10-K for additional information about our revenue recognition policy and criteria for recognizing revenue. We enter into contracts with multiple performance obligations where customers purchase a combination of IDEXX products and services. Determining whether products and services are considered distinct performance obligations that should be accounted for separately requires judgment. We determine the transaction price for a contract based on the total consideration we expect to receive in exchange for the transferred goods or services. To the extent the transaction price includes variable consideration, such as volume rebates or expected price adjustments, we apply judgment in constraining the estimated variable consideration due to factors that may cause reversal of revenue recognized. We evaluate constraints based on our historical and projected experience with similar customer contracts. We allocate revenue to each performance obligation in proportion to the relative standalone selling prices and recognize revenue when control of the related goods or services is transferred for each obligation. We utilize the observable standalone selling price when available, which represents the price charged for the performance obligation when sold separately. When standalone selling prices for our products or services are not directly observable we determine the standalone selling prices using relevant information available and apply suitable estimation methods including, but not limited to, the cost plus a margin approach. Our up-front loyalty programs provide customers with incentives in the form of cash payments or IDEXX Points upon entering into multi-year agreements to purchase annual minimum amounts of future products or services. If a customer breaches its agreement, they are required to refund all or a portion of the up-front cash or IDEXX Points, or make other repayments, remedial actions, or both. Up-front incentives to customers in the form of cash or IDEXX Points are not made in exchange for distinct goods or services and are capitalized as customer acquisition costs within other current and long-term assets, which are subsequently recognized as a reduction to revenue over the term of the customer agreement. If these up-front incentives are subsequently utilized to purchase instruments, we allocate total consideration, including future committed purchases less up- front incentives and estimates of expected price adjustments, based on relative standalone selling prices to identified performance obligations and recognize instrument revenue and cost at the time of installation and customer acceptance. We estimate, based on historical experience, and apply judgment to predict the amounts of future customer purchases and expected price adjustments related to these multi-year agreements. Differences between estimated and actual customer purchases may impact the amount and timing of revenue recognition and a 10% change in these estimates would have increased or reduced other assets and cumulative revenue related to these programs by approximately $1.5 million at December 31, 2020. Our volume commitment programs, such as our IDEXX 360 program, provide customers with free or discounted instruments or systems upon entering into multi-year agreements to purchase annual minimum amounts of products and services. We allocate total consideration, including future committed purchases and expected price adjustments, based on relative standalone selling prices to identified performance obligations and recognize instrument revenue and cost at the time of installation and customer acceptance in advance of billing the customer, which is also when the customer obtains control of the instrument based on legal title transfer. Our right to future consideration related to instrument revenue is recorded as a contract 40


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    asset within other current and long-term assets. The contract asset is transferred to accounts receivable when customers are billed for future products and services over the term of the contract. We estimate, based on historical experience, and apply judgment to predict the amounts of future customer purchases and expected price adjustments related to these multi-year agreements. Differences between estimated and actual customer purchases may impact the amount and timing of revenue recognition and a 10% change in these estimates would have increased or reduced contract assets and cumulative revenue related to these programs by approximately $3.1 million at December 31, 2020. Our instrument rebate programs require an instrument purchase and provide customers the opportunity to earn future rebates based on the volume of products and services they purchase over the term of the program. We account for the customer’s right to earn rebates on future purchases as a separate performance obligation and determine the standalone selling price based on an estimate of rebates the customer will earn over the term of the program. Total consideration allocated to identified performance obligations is limited to goods and services that the customer is presently obligated to purchase and does not include estimates of future purchases that are optional. We allocate total consideration to identified performance obligations, including a customer’s right to earn rebates on future purchases, which is deferred and recognized upon the purchase of future products and services, partly offsetting future rebates as they are earned. We estimate, based on historical experience, and apply judgment to predict the amounts of future customer rebates related to these multi-year agreements. Differences between estimated and actual customer rebates may impact the amount and timing of revenue recognition and a 10% change in these estimates would have increased or reduced deferred revenue and cumulative revenue related to these programs by approximately $1.8 million at December 31, 2020. Future market conditions and changes in product offerings may cause us to change marketing strategies to increase or decrease customer incentive offerings, possibly resulting in incremental reductions of revenue in future periods as compared to reductions in the current or prior periods. Additionally, certain customer programs require us to estimate, based on historical experience, and apply judgment to predict the amounts of future customer purchases, customer rebates and other incentive payments, and price adjustments related to multi-year agreements. Differences between estimated and actual customer purchases may impact the amount and timing of revenue recognition as described above. Valuation of Goodwill and Other Intangible Assets A significant portion of the purchase price for acquired businesses is generally assigned to intangible assets. Intangible assets other than goodwill are initially valued at fair value. If a quoted price in an active market for the identical asset is not readily available at the measurement date, the fair value of the intangible asset is estimated based on discounted cash flows using market participant assumptions, which are assumptions that are not specific to IDEXX. The selection of appropriate valuation methodologies and the estimation of discounted cash flows require significant assumptions about the timing and amounts of future cash flows, risks, appropriate discount rates, and the useful lives of intangible assets. When significant, we typically utilize independent valuation experts to advise and assist us in determining the fair values of the identified intangible assets acquired in connection with a business acquisition and in determining appropriate amortization methods and periods for those intangible assets. Goodwill is initially valued based on the excess of the purchase price of a business combination over the fair value of acquired net assets recognized and represents the future economic benefits arising from other assets acquired that could not be separately identified and recognized. We assess goodwill for impairment annually, at the reporting unit level, in the fourth quarter and whenever events or circumstances indicate impairment may exist. An impairment charge is recorded for the amount, if any, by which the carrying amount of goodwill exceeds its implied fair value. Our reporting units are the individual product and service categories that comprise our CAG operating segment, our Water and LPD operating segments and goodwill remaining from the restructuring of our pharmaceutical business in the fourth quarter of 2008. A substantial portion of the goodwill remaining from the pharmaceutical business, included in our “Other Segment”, is associated with intellectual property that has been, or that we expect to be, licensed to third parties. Realization of this goodwill is dependent upon the success of those third parties in developing and commercializing products, which will result in our receipt of royalties and other payments. As part of our goodwill testing process, we evaluate factors specific to a reporting unit as well as industry and macroeconomic factors that are reasonably likely to have a material impact on the fair value of a reporting unit. Examples of the factors considered in assessing the fair value of a reporting unit include: the results of the most recent impairment test, the competitive environment, the regulatory environment, the effects of the ongoing COVID-19 pandemic, anticipated changes in product or labor costs, revenue growth trends, the consistency of operating margins and cash flows and current and long-range financial forecasts. The long-range financial forecasts of the reporting units, which are based upon management’s long-term view of our markets, are used by senior management and the Board of Directors to evaluate operating performance. 41


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    In the fourth quarters of 2020 and 2019, we elected to bypass the qualitative approach that allows the assessment of qualitative factors to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount and instead proceeded directly to assessing the fair value of all of our reporting units and comparing the fair value of each reporting unit to the carrying value to determine if any impairment exists. We estimate the fair values of applicable reporting units using an income approach based on discounted forecasted cash flows. We make significant assumptions about the extent and timing of future cash flows, growth rates and discount rates. Model assumptions are based on our projections and best estimates, using appropriate and customary market participant assumptions. In addition, we make certain assumptions in allocating shared assets and liabilities to individual reporting units in determining the carrying value of each reporting unit. To validate the reasonableness of our reporting units' estimated fair values, we reconcile the aggregate fair values of our reporting units to our total market capitalization. Valuation assumptions reflect our projections and best estimates, based on significant assumptions about the extent and timing of future cash flows, growth rates and discount rates. The results of our most recent goodwill impairment test in the fourth quarter of 2020, indicated an excess of estimated fair value over the carrying amount for each of our reporting units with a minimum of approximately 100% and an weighted average of approximately 1,250% in total. The majority of our goodwill is related to our CAG Diagnostics reporting units with an weighted average of approximately 1,300% excess of estimated fair value over the carrying amount, including our Reference Laboratory Diagnostic and Consulting Services, Rapid Assay Products, and IDEXX VetLab Consumables, Instruments, Services and Accessories. We also maintain approximately $46 million of goodwill associated with our Veterinary Software and Services reporting unit, which is primarily comprised of recent acquisitions of early-stage software companies that expand our suite of technology applications for the veterinary profession, including SaaS-based practice management systems, applications that extend workflow capabilities, client marketing, wellness plan management and other connectivity and communication needs. These software applications continue to be in the earlier stages of commercial development, and therefore our Veterinary Software and Services reporting unit has a relatively lower excess of estimated fair value over the carrying amount, as indicated by the results of our most recent goodwill impairment test, which indicated approximately $325 million and 350% of the reporting unit’s carrying value. Realization of this goodwill is dependent on our successful commercialization of these early- stage software applications. Additionally, we maintain approximately $6.5 million of goodwill associated with our remaining pharmaceutical intellectual property, out-licensing arrangements, and certain retained drug delivery technologies (collectively “Pharmaceutical Activities”) that we seek to commercialize through arrangements with third parties. Currently, our primary support for the carrying value of this goodwill is royalty revenue associated with the commercialization of certain intellectual property. There is no guarantee that we will be able to maintain or increase revenues from our remaining Pharmaceutical Activities. The results of our goodwill impairment test for these Pharmaceutical Activities indicate an excess of estimated fair value over the carrying amount of this reporting unit by approximately $6.4 million and approximately 100% of the reporting unit’s carrying value. While we believe that the assumptions used to determine the estimated fair values of each of our reporting units are reasonable, a change in assumptions underlying these estimates could result in a material negative effect on the estimated fair value of the reporting units. Our fair value estimate assumes the achievement of future financial results contemplated in our forecasted cash flows, and there can be no assurance that we will realize that value. We use forecasts to estimate future cash flows and include an estimate of long-term future growth rates based on our most recent views of the long-term outlooks for our reporting units. Actual results may differ from those assumed in our forecasts. The discount rate is based on a weighted average cost of capital derived from industry peers. Changes in market conditions, interest rates, growth rates, tax rates, costs, pricing, or the discount rate would affect the estimated fair values of our reporting units and could result in a goodwill impairment charge in a future period. No goodwill impairments were identified during the years ended December 31, 2020, 2019 and 2018. A prolonged economic downturn in the U.S. or internationally resulting in lower long-term growth rates and reduced long-term profitability may reduce the fair value of our reporting units. Industry specific events or circumstances could have a negative impact on our reporting units and may also reduce the fair value of our reporting units. Should such events occur, and it becomes more likely than not that a reporting unit’s fair value has fallen below its carrying value, we will perform an interim goodwill impairment test, in addition to the annual impairment test. Future impairment tests may result in an impairment of goodwill, depending on the outcome of future impairment tests. An impairment of goodwill would be reported as a non-cash charge to earnings. 42


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    We assess the realizability of intangible assets whenever events or changes in circumstances indicate that the carrying value may not be recoverable. If an impairment review is triggered, we evaluate the carrying value of intangible assets, other than goodwill, based on estimated undiscounted future cash flows over the remaining useful life of the primary asset of the asset group and compare that value to the carrying value of the asset group. The asset group is the lowest level for which identifiable cash flows associated with the intangible asset are largely independent. The cash flows that are used contain our best estimates, using appropriate and customary assumptions and projections at the time. If the net carrying value of the asset group exceeds the related estimated undiscounted future cash flows, an impairment to adjust the intangible asset to its fair value would be reported as a non-cash charge to earnings. If necessary, we would calculate the fair value of an intangible asset using the present value of the estimated future cash flows to be generated by the intangible asset and applying a risk-adjusted discount rate. The amount of impairment for the year ended December 31, 2020 was immaterial. We had no impairments of our intangible assets during the years ended December 31, 2019 and 2018. Income Taxes The provision for income taxes is determined using the asset and liability approach of accounting for income taxes. Under this approach, deferred taxes represent the estimated future tax effects of temporary differences between book and tax treatment of assets and liabilities and carryforwards to the extent they are realizable. On a quarterly basis, we assess our current and projected earnings by jurisdiction to determine whether or not our earnings during the periods when the temporary differences become deductible will be sufficient to realize the related future tax benefits. Should we determine that we would not be able to realize all or part of our net deferred tax asset in a particular jurisdiction in the future, an adjustment to the deferred tax asset would be charged to income in the period such determination was made. For those jurisdictions where tax carryforwards are likely to expire unused or the projected operating results indicate that realization is not more likely than not, a valuation allowance is recorded to offset the deferred tax asset within that jurisdiction. In assessing the need for a valuation allowance, we consider future taxable income and ongoing prudent and feasible tax planning strategies. In the event that we determine that we would be able to realize our deferred tax assets in the future in excess of the net recorded amount, a reduction of the valuation allowance would increase income in the period such determination was made. Likewise, should we determine that we would not be able to realize all or part of our net deferred tax asset in the future, a reduction to the deferred tax asset would be charged against income in the period such determination was made. Our net taxable temporary differences and tax carryforwards are recorded using the enacted tax rates expected to apply to taxable income in the periods in which the deferred tax liability or asset is expected to be settled or realized. Should the expected applicable tax rates change in the future, an adjustment to our deferred taxes would be credited or charged, as appropriate, to income in the period such determination was made. We periodically assess our exposures related to our worldwide provision for income taxes and believe that we have appropriately accrued taxes for contingencies. Any reduction of these contingent liabilities or additional assessment would increase or decrease income, respectively, in the period such determination was made. We record a liability for uncertain tax positions that do not meet the more likely than not standard as prescribed by the authoritative guidance for income tax accounting. We record tax benefits for only those positions that we believe will more likely than not be sustained. For positions that we believe that it is more likely than not that we will prevail, we record a benefit considering the amounts and probabilities that could be realized upon ultimate settlement. If our judgment as to the likely resolution of the uncertainty changes, if the uncertainty is ultimately settled or if the statute of limitation related to the uncertainty expires, the effects of the change would be recognized in the period in which the change, resolution or expiration occurs. Our net liability for uncertain tax positions was $26.0 million as of December 31, 2020, and $29.7 million as of December 31, 2019, which includes estimated interest expense and penalties. See "Part II, Item 8. Financial Statements and Supplementary Data, Note 14. Income Taxes" in the accompanying Notes to consolidated financial statements for more information. 43


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    RECENT ACCOUNTING PRONOUNCEMENTS See "Part II, Item 8. Financial Statements and Supplementary Data, Note 2. Summary of Significant Accounting Policies (v) and (w)" to the consolidated financial statements for the year ended December 31, 2020, included in this Annual Report on Form 10-K for a complete discussion of recent accounting pronouncements adopted and not adopted. RESULTS OF OPERATIONS AND TRENDS Effects of Certain Factors on Results of Operations Market Trends and COVID-19 Pandemic Impact. The primary impacts of the COVID-19 pandemic have been seen in our CAG business. While veterinary care is widely recognized as an “essential” service, stay-at-home policies deployed to combat the spread of COVID-19 constrained visits to veterinary practices significantly in late March 2020 through early April 2020, pressuring diagnostic testing volumes. Restrictions on sales professionals’ access to veterinary clinics also contributed to deferrals on new CAG instrument placements. As stay-at-home policies were relaxed, there was a sharp rebound in clinical visit activity which accelerated through the second quarter of 2020, and continued through the second half of 2020. Weekly U.S. companion animal practice data showed improvement in same-store clinical visits trends since mid-April 2020 and solid CAG market momentum has continued in early 2021. Companion animal market improvement trends globally have supported a strong recovery in demand for CAG diagnostic products and services. Global CAG Diagnostics recurring revenues declined approximately 16% in April 2020, followed by increases of approximately 8% in May 2020, 30% in June 2020, 24% in July 2020, and approximately 20% for the remainder of the third and fourth quarter of 2020. While these trends are encouraging, potential effects related to ongoing COVID-19 case management efforts are challenging to predict and may pressure future revenues should enhanced social distancing policies and higher infection rates impact veterinary clinic operations in certain regions. We have also seen impacts from the COVID-19 pandemic on Water testing volumes. There was some disruption to compliance Water testing early in the second quarter of 2020 related to business lockdown effects, as well as beach and pool closures, which has since had a solid recovery. Approximately 20% of our Water revenues are related to non-compliance testing, which has seen declines related to reduced overall business activity and prioritization of laboratory spending. We anticipate that near-to-moderate-term demand for non-compliance testing will continue to be impacted by pandemic and related economic pressures. In managing our businesses, we continue to provide high levels of service delivery and product support for customers during this time and maintain high health and safety standards to protect our employees and ensure business continuity. In an effort to continue to protect the health and safety of our workforce and their families and our communities, the majority of our employees continue to work remotely and travel remains highly restricted. We have introduced new employee benefits to support remote workers. Human COVID-19 Testing. On May 7, 2020, we announced that OPTI Medical was granted by the United States Food and Drug Administration ("FDA") an Emergency Use Authorization ("EUA") for the OPTI SARS-CoV-2 RT-PCR laboratory test kit for the detection of SARS-CoV-2, the virus that causes COVID-19. On June 5, 2020 OPTI Medical announced that it has received the CE mark certification in the European Union for its OPTI SARS-CoV-2 RT-PCR laboratory test kit. Additionally, the FDA has granted EUA for the new OPTI DNA/RNA Magnetic Bead Kit for nucleic acid extraction from respiratory samples to be used with the OPTI SARS-CoV-2 RT-PCR test kit, which enables OPTI Medical Systems to provide laboratories with a complete OPTI Medical Systems-manufactured workflow solution for COVID-19 testing. We also provide human COVID-19 testing laboratories services to the Maine Center for Disease Control and Prevention in support of their COVID-19 testing program. These products and services are included within our OPTI Medical business in our Other segment and are the primary driver of growth in that segment. Distributor Purchasing and Inventories. When selling our products through distributors, changes in distributors’ inventory levels can impact our reported sales, and these changes may be affected by many factors, which may not be directly related to underlying demand for our products by veterinary practices, which are the end users. If during the current year, distributors’ inventories grew by less than those inventories grew in the comparable period of the prior year, then changes in distributors’ inventories would have an unfavorable impact on our reported sales growth in the current period. Conversely, if 44


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    during the current year, distributors’ inventories grew by more than those inventories grew in the comparable period of the prior year, then changes in distributors’ inventories would have a favorable impact on our reported sales growth in the current period. In certain countries, we sell our products through third-party distributors and may be unable to obtain data for sales to end users. We do not believe the impact of changes in these distributors’ inventories had or would have a material impact on our growth rates. See “Part I, Item 1. Business, Marketing and Distribution” included in this Annual Report on Form 10-K for additional information regarding distribution channels. Currency Impact. For the year ended December 31, 2020, approximately 21% of our consolidated revenue was derived from products manufactured or sourced in U.S. dollars and sold internationally in local currencies, as compared to 22% for both years ended December 31, 2019 and 2018. Strengthening of the rate of exchange for the U.S. dollar relative to other currencies has a negative impact on our revenues derived in currencies other than the U.S. dollar and on profits of products manufactured or purchased in U.S. dollars and sold internationally, and a weakening of the U.S. dollar has the opposite effect. Similarly, to the extent that the U.S. dollar is stronger in current or future periods relative to the exchange rates in effect in the corresponding prior periods, our growth rate will be negatively affected. The impact of foreign currency denominated operating expenses and foreign currency denominated supply contracts partly offsets this exposure. Additionally, our designated hedges of intercompany inventory purchases and sales help delay the impact of certain exchange rate fluctuations on non-U.S. denominated revenues. See “Part II, Item 7A. Quantitative and Qualitative Disclosures About Market Risk” included in this Annual Report on Form 10-K for additional information regarding currency impact. Our future income tax expense could also be affected by changes in the mix of earnings, including as a result of changes in the rate of exchange for the U.S. dollar relative to currencies in countries with differing statutory tax rates. See “Part I, Item 1A. Risk Factors” included in this Annual Report on Form 10-K for additional information regarding tax impacts. Effects of Economic Conditions. Pet owners generally pay cash out of pocket for health care services for their pets from veterinary practices. Demand for our products and services is vulnerable to changes in the economic environment, including slow economic growth, high unemployment, and credit availability. Negative or cautious consumer sentiment can lead to reduced or delayed consumer spending, resulting in a decreased number of patient visits to veterinary clinics. Unfavorable economic conditions can impact sales of instruments, diagnostic imaging and practice management systems, which are larger capital purchases for veterinarians. Additionally, economic turmoil can cause our customers to remain sensitive to the pricing of our products and services. In the U.S., we monitor patient visits and clinic revenue data provided by a subset of our CAG customers. Although this data is a limited sample and susceptible to short-term impacts such as weather, which may affect the number of patient visits in a given period, we believe that this data provides a fair and meaningful long-term representation of the trend in patient visit activity in the U.S., providing us insight regarding demand for our products and services. Economic conditions can also affect the purchasing decisions of our Water and LPD business customers. Water testing volumes may be susceptible to declines in discretionary testing for existing home and commercial sales and in mandated testing as a result of decreases in home and commercial construction. Testing volumes may also be impacted by severe weather conditions such as drought. In addition, fiscal difficulties can also reduce government funding for water and herd health screening services. We believe that the diversity of our products and services and the geographic diversity of our markets partially mitigate the potential effects of the economic environment and negative consumer sentiment on our revenue growth rates. Effects of Patent Expiration. Although we have several patents and licenses of patents and technologies from third parties that expired during 2020, and several that are expected to expire in 2021 and beyond, the expiration of these patents or licenses, individually or in the aggregate, is not expected to have a material effect on our financial position or future operations due to a range of factors as described in "Part I, Item 1. Business, Patents and Licenses”. Non-GAAP Financial Measures. The following revenue analysis and discussion focuses on organic revenue growth, and references in this analysis and discussion to “revenue,” “revenues” or “revenue growth” are references to “organic revenue growth.” Organic revenue growth is a non-GAAP financial measure and represents the percentage change in revenue during the current year, as compared to the same period for the prior year, net of the effect of changes in foreign currency exchange rates, certain business acquisitions, and divestitures. Organic revenue growth should be considered in addition to, and not as a replacement for, or as a superior measure to, revenues reported in accordance with U.S. GAAP, and may not be comparable to similarly titled measures reported by other companies. Management believes that reporting organic revenue growth provides useful information to investors by facilitating easier comparisons of our revenue performance with prior and future periods and to the performance of our peers. 45


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    We exclude from organic revenue growth the effect of changes in foreign currency exchange rates because changes in foreign currency exchange rates are not under management’s control, are subject to volatility and can obscure underlying business trends. We calculate the impact on revenue resulting from changes in foreign currency exchange rates by applying the difference between the weighted average exchange rates during the current year period and the comparable prior year period to foreign currency denominated revenues for the prior year period. We also exclude from organic revenue growth the effect of certain business acquisitions and divestitures because the nature, size and number of these transactions can vary dramatically from period to period, and because they either require or generate cash as an inherent consequence of the transaction, and therefore can also obscure underlying business and operating trends. We consider acquisitions to be a business when all three elements of inputs, processes and outputs are present, consistent with ASU 2017-01, “Business Combinations: (Topic 805) Clarifying the Definition of a Business.” In a business combination, if substantially all the fair value of the assets acquired is concentrated in a single identifiable asset or group of similar identifiable assets, we do not consider these assets to be a business. A typical acquisition that we do not consider a business is a customer list asset acquisition, which does not have all elements necessary to operate a business, such as employees or infrastructure. We believe the efforts required to convert and retain these acquired customers are similar in nature to our existing customer base and therefore are included in organic revenue growth. We also use Adjusted EBITDA, gross debt, net debt, gross debt to Adjusted EBITDA ratio and net debt to Adjusted EBITDA ratio, all of which are non-GAAP financial measures that should be considered in addition to, and not as a replacement for, financial measures presented according to U.S. GAAP. Management believes that reporting these non-GAAP financial measures provides supplemental analysis to help investors further evaluate our business performance and available borrowing capacity under our Credit Facility. CEO Transition. In the fourth quarter of 2019, Jonathan (Jay) Mazelsky was appointed our President and Chief Executive Officer, while Jonathan W. Ayers, our former Chairman of the Board, President and Chief Executive Officer stepped down as Chairman of the Board, ceased to be an employee of the Company and transitioned to the role of external Senior Advisor to the Company and a director on our Board. In connection with the foregoing, Mr. Ayers and IDEXX entered into a mutual separation agreement that provided for severance payments in accordance with the terms of his pre-existing employment agreement and modified his outstanding stock options. As a result, we recognized a charge to operating income of approximately $13.4 million in the fourth quarter of 2019, representing the cost of the severance and an acceleration of the cost of the equity awards, which was partially offset by a reduction to our provision for income taxes of approximately $1.2 million, resulting in a total charge to net income of approximately $12.2 million, net of tax impacts. Comparisons to Prior Periods. Our fiscal years end on December 31. Unless otherwise stated, the analysis and discussion of our financial condition, results of operations and liquidity, including references to growth and organic growth and increases and decreases, are being compared to the equivalent prior year period. 46


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    Twelve Months Ended December 31, 2020, Compared to Twelve Months Ended December 31, 2019 Total Company The following table presents revenue by operating segment by U.S. markets and non-U.S., or international markets: For the Years Ended December 31, Percentage Percentage Reported Change Change Organic Net Revenue Dollar Revenue from from Revenue (dollars in thousands) 2020 2019 Change Growth (1) Currency Acquisitions Growth (1) 𝅺 CAG $ 2,385,765 $ 2,119,183 $ 266,582 12.6% 0.2% 0.5 % 11.9% United States 1,593,855 1,410,278 183,577 13.0% — 0.8 % 12.2% International 791,910 708,905 83,005 11.7% 0.5% — 11.2% 𝅺 Water $ 128,625 $ 132,850 $ (4,225) (3.2%) (1.6%) — (1.6%) United States 62,083 62,673 (590) (0.9%) — — (0.9%) International 66,542 70,177 (3,635) (5.2%) (3.0%) — (2.2%) 𝅺 LPD $ 145,845 $ 132,635 $ 13,210 10.0% (1.1%) — 11.0% United States 14,533 14,230 303 2.1% — — 2.1% International 131,312 118,405 12,907 10.9% (1.2%) — 12.1% 𝅺 Other $ 46,420 $ 22,240 $ 24,180 108.7% — — 108.7% 𝅺 Total Company $ 2,706,655 $ 2,406,908 $ 299,747 12.5% — 0.5 % 12.0% United States 1,691,224 1,495,516 195,708 13.1% — 0.8 % 12.3% International 1,015,431 911,392 104,039 11.4% (0.1%) — 11.5% (1) Reported revenue growth and organic revenue growth may not recalculate due to rounding. Total Company Revenue. In our CAG business, we experienced significant pressure on testing volumes in the first half of the year, specifically in late-March through mid-April related to COVID-19 social distancing procedures and guidelines. We then experienced a sharp recovery in market demand for companion animal diagnostics globally, including high levels of growth in testing volumes beginning in June 2020 through the fourth quarter, supported by pent-up demand for wellness and non-wellness testing as social distancing procedures and guidelines were eased during the third quarter, as well as higher clinical visits related to new patients. In our LPD business, the increased demand for swine testing in China was partially offset by lower herd health screening revenue. Lower revenues in our Water business are primarily the result of the COVID-19 pandemic, due to lower demand for non-compliance testing. The impact of currency movements on revenue was immaterial. 47


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    The following table presents our total Company results of operations: 𝅺 For the Years Ended December 31, Change Total Company - Results of Operations Percent of Percent of (dollars in thousands) 2020 Revenue 2019 Revenue Amount Percentage 𝅺 Revenues $ 2,706,655 $ 2,406,908 $ 299,747 12.5 % Cost of revenue 1,135,615 1,041,359 94,256 9.1 % Gross profit 1,571,040 58.0 % 1,365,549 56.7 % 205,491 15.0 % 𝅺 Operating Expenses: Sales and marketing 434,435 16.1 % 418,193 17.4 % 16,242 3.9 % General and administrative 300,832 11.1 % 261,317 10.9 % 39,515 15.1 % Research and development 141,249 5.2 % 133,193 5.5 % 8,056 6.0 % Total operating expenses 876,516 32.4 % 812,703 33.8 % 63,813 7.9 % Income from operations $ 694,524 25.7 % $ 552,846 23.0 % $ 141,678 25.6 % Gross Profit. Gross profit increased due to higher sales volumes and a 130 basis point increase in the gross profit margin. The increase in the gross profit margin was driven by several factors, including the mix benefit from strong IDEXX VetLab consumable and lower CAG Diagnostics instrument revenue, productivity and volume leverage in our reference laboratories, the net benefit of price increases, as well as the benefit from OPTI COVID-19 PCR testing. Lower product costs from volume leverage in our LPD segment also contributed favorably to our gross profit margin. These favorable factors were offset by the incremental investments in reference laboratory capacity and systems, including acquisitions. The impact from foreign currency movements decreased the gross profit margin by approximately 40 basis points, including the impact of hedge gains in the current year, as compared to higher hedge gains in the prior year. Operating Expenses. The increase in sales and marketing expense was primarily due to increased personnel-related costs related to our expanded global commercial infrastructure, partially offset by cost containment efforts implemented in response to the COVID-19 pandemic, including travel restrictions and temporary compensation and benefit reductions. The increase in general and administrative expense was primarily due to an accrual related to an ongoing litigation matter and a charitable donation, as well as increases in bad debt reserves and higher facilities costs. These increases were partially offset by the absence of CEO separation costs incurred in the prior year, as well as temporary cost containment efforts and prudent expense management across our business segments. The increase in research and development expense was primarily due to higher personnel-related costs, as well as new product development costs, partially offset by temporary cost containment efforts. The overall change in currency exchange rates resulted in a decrease in operating expenses by less than 1%. 48

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