X0306 4 2016-11-30 0 0000874716 IDEXX LABORATORIES INC /DE IDXX 0001526223 Studer Jacqueline ONE IDEXX DRIVE WESTBROOK ME 04092 0 1 0 0 CVP, Gen. Counsel & Secretary Common Stock 2016-11-30 4 M 0 800 79.54 A 2974 D Incentive Stock Option (right-to-buy) 79.54 2016-11-30 4 M 0 800 D 2025-02-13 Common Stock 800 5480 D Includes 52 shares acquired under the IDEXX Laboratories, Inc. Employee Stock Purchase Plan on September 30, 2016. Grant of option to buy 3,140 shares of IDEXX Laboratories, Inc. common stock that vests and is exercisable in five equal annual installments beginning on February 14, 2016, without giving effect to the 2-for-1 stock split of IDEXX Laboratories, Inc. common stock that occurred on June 15, 2015 (the "Stock Split"). The number of derivative securities reported as beneficially owned with respect to this option and its exercise price were adjusted to reflect the Stock Split. Not applicable. /s/ Lily J. Lu, Attorney-in-Fact for Jacqueline L. Studer 2016-12-02