X0306 4 2018-05-09 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 2018-05-09 4 A 0 224 A Common Stock 224 720 D Non-Qualified Stock Option (right-to-buy) 206.62 2018-05-09 4 A 0 2187 A 2028-05-08 Common Stock 2187 2187 D Each deferred stock unit represents a contingent right to receive one share of IDEXX Laboratories, Inc. common stock. Deferred stock units vest in one installment on the one year anniversary of the date of grant or on the date of the 2019 annual meeting of shareholders, whichever event is 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 vest in one installment on May 9, 2019. Not applicable. /s/ Lily J. Lu, Attorney-in-Fact for Lawrence D. Kingsley 2018-05-11