X0306 4 2020-05-06 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 2020-05-06 4 A 0 370 A Common Stock 370 1599 D Deferred Stock Unit 2020-05-06 4 A 0 141 A Common Stock 141 1740 D Non-Qualified Stock Option (right-to-buy) 283.59 2020-05-06 4 A 0 1279 A 2030-05-05 Common Stock 1279 1279 D Non-Qualified Stock Option (right-to-buy) 283.59 2020-05-06 4 A 0 487 A 2030-05-05 Common Stock 487 487 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 2021 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. Additional grant made pursuant to reporting person's role as Non-Executive Chairman of the Board. Grant of option to buy shares of IDEXX Laboratories, Inc. common stock that vest in one installment on the one year anniversary of the date of grant or on the date of the 2021 annual meeting of shareholders, whichever event is earlier. Not applicable. /s/ Lily J. Lu, Attorney-in-Fact for Lawrence D. Kingsley 2020-05-08