X0306 5 2018-12-31 0 0 0 0000874716 IDEXX LABORATORIES INC /DE IDXX 0001184149 AYERS JONATHAN W ONE IDEXX DRIVE WESTBROOK ME 04092 1 1 0 0 Chairman, President & CEO Common Stock 2018-11-28 5 G 0 4200 0 D 1031322 D Common Stock 138000 I by Ayers Family Trust Includes 25 shares acquired under the IDEXX Laboratories, Inc. Employee Stock Purchase Plan on December 31, 2018. /s/ Lily J. Lu, Attorney-in-Fact for Jonathan W. Ayers 2019-02-05