X0306 4 2021-05-12 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 Restricted Stock Unit 2021-05-12 4 A 0 224 A Common Stock 224 224 D Restricted Stock Unit 2021-05-12 4 A 0 78 A Common Stock 78 302 D Non-Qualified Stock Option (right-to-buy) 512.31 2021-05-12 4 A 0 723 A 2031-05-11 Common Stock 723 723 D Non-Qualified Stock Option (right-to-buy) 512.31 2021-05-12 4 A 0 252 A 2031-05-11 Common Stock 252 975 D \Each restricted stock unit represents a contingent right to receive one share of IDEXX Laboratories, Inc. common stock. Restricted stock units vest in in one installment on the one year anniversary of the date of grant or on the date of the 2022 annual meeting of shareholders, whichever event is earlier. Additional grant made pursuant to reporting person's role as Non-Executive Board Chair. 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 2022 annual meeting of shareholders, whichever event is earlier. Not applicable. /s/ Lily J. Lu, Attorney-in-Fact for Lawrence D. Kingsley 2021-05-14