X0306 4 2016-12-01 0 0000874716 IDEXX LABORATORIES INC /DE IDXX 0001301427 Kingsley Lawrence D C/O IDEXX LABORATORIES, INC. ONE IDEXX DRIVE WESTBROOK ME 04092 1 0 0 0 Deferred Stock Unit 2016-12-01 4 A 0 207 A Common Stock 207 207 D Non-Qualified Stock Option (right-to-buy) 114.17 2016-12-01 4 A 0 2203 A 2026-11-30 Common Stock 2203 2203 D This equity grant represents pro rata equity compensation earned by the reporting person as a non-employee Director from his election to the IDEXX Laboratories, Inc. Board of Directors on October 19, 2016 until the 2017 annual meeting of stockholders. Each deferred stock unit ("DSU") represents a contingent right to receive one share of IDEXX Laboratories, Inc. common stock. These DSUs will fully vest on the date of the 2017 annual meeting of stockholders or May 3, 2017, whichever event occurs earlier, and are payable as common stock one year following the Director's resignation from the Board of Directors. Grant of option to buy shares of IDEXX Laboratories, Inc. common stock that vests in one installment on May 3, 2017. Not applicable. /s/ Lily J. Lu, Attorney-in-Fact for Lawrence D. Kingsley 2016-12-02