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Securities registered pursuant to Section 12(b) of the Act:

Effective June 28, 2019, the Board of Directors (the “Board”) of IDEXX Laboratories, Inc. (the “Company”) appointed Jay Mazelsky as the Company’s Interim President and Chief Executive Officer, following a serious bicycling accident on June 27, 2019 involving Jonathan W. Ayers, Chairman, President and Chief Executive Officer of the Company, which resulted in Mr. Ayers sustaining a severe spinal cord injury. As the Interim President and Chief Executive Officer, Mr. Mazelsky has assumed Mr. Ayers’s management responsibilities while continuing to oversee the Company’s North American Companion Animal Group Commercial Organization and key elements of the Company’s innovation portfolio, including the global in-house diagnostics and Veterinary Software and Services businesses. Mr. Mazelsky is working closely with Brian McKeon, the Company’s Chief Financial Officer, who has assumed additional oversight responsibility for the Water and Livestock, Poultry and Dairy business segments, as well as the Companion Animal Group business in Latin America and the business of OPTI Medical Systems, Inc., while continuing to be responsible for the Company’s finance, corporate development and strategy, worldwide operations and investor relations functions.

In recognition of Mr. Mazelsky’s role as Interim President and Chief Executive Officer and the associated increase in his responsibilities, on August 5, 2019 (the “Grant Date”), the Compensation Committee of the Board approved the grant to Mr. Mazelsky of a special equity award having an aggregate Grant Date value of approximately $2,000,000, consisting of: (i) a stock option to purchase a specified number of shares of Common Stock, $0.10 par value, of the Company (the “Common Stock”) (rounded to avoid the issuance of fractional shares) determined using the Black-Scholes-Merton option pricing model and having a Grant Date value of $1,500,000; and (ii) a restricted stock unit award representing the right to receive a specified number of shares of Common Stock equal to the quotient (rounded to avoid the issuance of fractional shares) of $500,000, divided by the closing price of the Common Stock on the NASDAQ market on the Grant Date (the “Closing Price”).

In addition, in recognition of Mr. McKeon’s increased responsibilities, on the Grant Date, the Compensation Committee of the Board approved the grant to Mr. McKeon of a special equity award having an aggregate Grant Date value of approximately $1,000,000, consisting of: (i) a stock option to purchase a specified number of shares of Common Stock (rounded to avoid the issuance of fractional shares) determined using the Black-Scholes-Merton option pricing model and having a Grant Date value of $750,000; and (ii) a restricted stock unit award representing the right to receive a specified number of shares of Common Stock equal to the quotient (rounded to avoid the issuance of fractional shares) of $250,000, divided by the Closing Price.

The foregoing awards, which were granted under the Company’s 2018 Stock Incentive Plan, will vest ratably over five years, so long as the executive remains employed by the Company. Each of the stock option awards has an exercise price per share of the Closing Price and a ten-year term.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.