IDEXX Laboratories Investor Presentation — September 2017

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1 © 2017 IDEXX Laboratories, Inc. All rights reserved.

The IDEXX Opportunity

Brian McKeon, Executive Vice President and CFO

Bank of America Merrill Lynch Global Healthcare Conference

London I September 13, 20172 © 2017 IDEXX Laboratories, Inc. All rights reserved.

Safe Harbor Disclaimer

The following information contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. These

forward-looking statements are based on management ’s current expectations and beliefs, as well as a number of assumptions concerning future

events. These statements are subject to risks, uncertainties, assumptions and other important factors. You are cautioned not to put undue

reliance on such forward-looking statements because actual results may vary materially from those expressed or implied. The reports filed by

the Company pursuant to United States securities laws contain discussions of these risks and uncertainties. The Company assum es no

obligation to, and expressly disclaims any obligation to, update or revise any forward-looking statements, whether as a result of new information,

future events or otherwise. You are advised to review the Company ’s filings with the United States Securities and Exchange Commission (which

are available from the SEC ’s EDGAR database at www.sec.gov and via the Company ’s website at www.idexx.com ).

We refer in this presentation to 2017 outlook communicated on August 1, 2017; these references speak only as of August 1, 2017 and shall not

be deemed to be a reiteration or affirmation of the guidance or an indication that our expectations have not changed since that time.

Non-GAAP Financial Measures

In this presentation, we refer to some non-GAAP financial measures. For a reconciliation to the most comparable GAAP financial m easures, we

refer you to our footnotes and the Appendix to this presentation, which also refer to our Definitive Proxy Statement filed March 23, 2017 and

Annual Report on Form 10-K for the year ended December 31, 2016, both of which are available at http://www.idexxproxymaterials.com .

Please refer to additional footnotes in the Appendix. 3 © 2017 IDEXX Laboratories, Inc. All rights reserved.

IDEXX Serves Exceptionally Attractive Spaces

Pet Health Livestock HealthWater Quality4 © 2017 IDEXX Laboratories, Inc. All rights reserved.

Core Business Characteristics

•Global market leadership –

grounded in innovation

•Robust underlying market

•High-margin, durable

recurring revenue streams