X0306 4 2017-01-01 0 0000874716 IDEXX LABORATORIES INC /DE IDXX 0001219445 MCKEON BRIAN P ONE IDEXX DRIVE WESTBROOK ME 04092 0 1 0 0 Executive VP & CFO Common Stock 2017-01-01 4 M 0 2820 0 A 36416 D Common Stock 2017-01-01 4 F 0 1105 117.27 D 35311 D Restricted Stock Unit 2017-01-01 4 M 0 2820 D Common Stock 2820 14386 D Includes a total of 285 shares acquired under the IDEXX Laboratories, Inc. Employee Stock Purchase Plan on March 31, 2016, June 30, 2016, September 30, 2016 and December 30, 2016. Closing price of Issuer's common stock on the NASDAQ market on December 30, 2016. These restricted stock units are part of a grant made to the reporting person on January 1, 2014 that have vested. Each restricted stock unit represents a contingent right to receive one share of IDEXX Laboratories, Inc. common stock. The restricted stock units vest in five equal annual installments, beginning on the first anniversary of the date of grant. The number of restricted stock units reported was adjusted to reflect a 2-for-1 stock split in the form of a 100% stock dividend on IDEXX Laboratories, Inc. common stock paid on June 15, 2015. Not applicable. /s/ Lily J. Lu, Attorney-in-Fact for Brian P. McKeon 2017-01-04