X0306 4 2016-02-14 0 0000874716 IDEXX LABORATORIES INC /DE IDXX 0001184149 AYERS JONATHAN W ONE IDEXX DRIVE WESTBROOK ME 04092 1 1 0 0 Chairman, President and CEO Common Stock 2016-02-14 4 M 0 2400 0.00 A 964124 D Common Stock 2016-02-14 4 M 0 2400 0.00 A 966524 D Common Stock 2016-02-14 4 M 0 2160 0.00 A 968684 D Common Stock 2016-02-14 4 M 0 1774 0.00 A 970458 D Common Stock 2016-02-14 4 F 0 2833 67.85 D 967625 D Common Stock 98000 I By Ayers Family Trust Non-Qualified Stock Option (right-to-buy) 67.85 2016-02-14 4 A 0 197954 A 2026-02-13 Common Stock 197954 197954 D Incentive Stock Option (right-to-buy) 67.85 2016-02-14 4 A 0 1476 A 2026-02-13 Common Stock 1476 1476 D Restricted Stock Unit 2016-02-14 4 M 0 2400 D Common Stock 2400 18376 D Restricted Stock Unit 2016-02-14 4 M 0 2400 D Common Stock 2400 15976 D Restricted Stock Unit 2016-02-14 4 M 0 2160 D Common Stock 2160 13816 D Restricted Stock Unit 2016-02-14 4 M 0 1774 D Common Stock 1774 12042 D Includes 84 shares acquired under the IDEXX Laboratories, Inc. Employee Stock Purchase Plan on December 31, 2015. Closing price of Issuer's common stock on the NASDAQ market on February 12, 2016. Grant of option to buy shares of Issuer common stock that becomes exercisable in five annual installments beginning February 14, 2017. Each restricted stock unit ("RSU") represents a contingent right to receive one share of Issuer common stock. The RSUs vested in five equal annual installments, beginning February 14, 2012. The number of RSUs have been adjusted to reflect the 2-for-1 stock split of Issuer common stock that occurred on June 15, 2015 (the "Stock Split"). Each RSU represents a contingent right to receive one share of Issuer common stock. This RSU grant vests in five equal annual installments, beginning February 14, 2013 and has been adjusted to reflect the Stock Split. Each RSU represents a contingent right to receive one share of Issuer common stock. This RSU grant vests in five equal annual installments, beginning February 14, 2014 and has been adjusted to reflect the Stock Split. Each RSU represents a contingent right to receive one share of Issuer common stock. This RSU grant vests in five equal annual installments, beginning February 14, 2015 and has been adjusted to reflect the Stock Split. Not applicable. /s/ Jacqueline L. Studer, Attorney-in-Fact for Jonathan W. Ayers 2016-02-17