IDEXX Laboratories Investor Presentation — January 2019

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Preventive Care KOL Summit

William Blair 39thAnnual Growth Stock Conference

Jonathan Ayers, Chairman and Chief Executive Officer June 5, 2019

2 © 2019 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 assumes 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 projections communicated at our Investor Day on August 15, 2018 and our 2019 outlook communi cated on May 1, 2019; these

references speak only as of the respective dates on which they were communicated 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 the Company's Annual Report on Form 10- K for the year ended December 31, 2018, both

available at www.idexx.com/investors .

Please refer to additional footnotes in the Appendix.

3 © 2019 IDEXX Laboratories, Inc. All rights reserved.IDEXX -Focus on Pet Healthcare Diagnostics and Software

•Long-term secular growth

•Durable recurring revenue

•Strong financial performance

4 © 2019 IDEXX Laboratories, Inc. All rights reserved.Pet Owners Appreciate the Mental Health Benefits of Their Pets,

with Millennials and Gen Z even more so

(22 yrs to 37 yrs)Gen X

(38 yrs to 53 yrs)Gen Z