IDEXX LABORATORIES INC /DE — Director's Dealing 2016

May 5, 2016

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: IDEXX LABORATORIES INC /DE (IDXX)
CIK: 0000874716
Period of Report: 2016-05-03

Reporting Person: END WILLIAM T (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2016-05-03	Common Stock	M	9924	$26.6550	Acquired	63578	Direct
2016-05-05	Common Stock	S	4924	$85.8703	Disposed	58654	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2016-05-03	Non-Qualified Stock Option (right-to-buy)	$26.6550	M	9924	Disposed	2017-02-13	Common Stock (9924)	Direct

Footnotes

F1: The sale price reported reflects the weighted average sale price of multiple transactions on the reported date at prices that ranged from $85.8510 to $85.8906 inclusive. The reporting person hereby undertakes to provide upon request to SEC staff, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price within the range.

F2: Grant of option to buy shares of IDEXX Laboratories, Inc. common stock that became exercisable as to 4,962 shares on February 14, 2011, 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.

F3: Not applicable.