X0206 3/A 2016-12-30 2017-01-06 0 0000874716 IDEXX LABORATORIES INC /DE IDXX 0001500399 TWIGGE GIOVANI IDEXX LABORATORIES, INC. ONE IDEXX DRIVE WESTBROOK ME 04092 0 1 0 0 CORPORATE VICE PRESIDENT Common Stock 17935 D Includes 206 shares of common stock that were omitted from the reporting person's original Form 3, and also were omitted from three additional Forms 4 filed by the reporting person after his original Form 3 was filed. /s/ Lily J. Lu, Attorney-in-Fact for Giovani Twigge 2018-01-26