IDEXX LABORATORIES INC /DE — Director's Dealing 2012

May 8, 2012

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: IDEXX LABORATORIES INC /DE (IDXX)
CIK: 0000874716
Period of Report: 2012-05-04

Reporting Person: RAINES MERILEE (Corporate VP & CFO)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2012-05-04	Common Stock	M	5836	$17.135	Acquired	176857	Direct
2012-05-04	Common Stock	M	2608	$38.335	Acquired	179465	Direct
2012-05-04	Common Stock	S	8144	$87.031	Disposed	171321	Direct
2012-05-04	Common Stock	S	300	$87.965	Disposed	171021	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2012-05-04	Incentive Stock Option (right to buy)	$17.135	M	5836	Disposed	2013-02-06	Common Stock (5836)	Direct
2012-05-04	Incentive Stock Option (right to buy)	$38.335	M	2608	Disposed	2013-02-13	Common Stock (2608)	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	13430	Indirect

Footnotes

F1: The sale price reported reflects the weighted average sale price of multiple transactions on the reported date at prices that ranged from $86.6600 to $87.5600, 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 ranges set forth in footnotes 1 and 2 to this Form 4.

F2: The sale price reported reflects the weighted average sale price of multiple transactions on the reported date at prices that ranged from $87.7300 to $88.1950, inclusive.

F3: Grant of options to buy shares of common stock that vest on the fifth anniversary date (02/06/2008) of the grant.

F4: Grant of options to buy shares of common stock that vest on the fifth anniversary date (02/14/2011) of the grant.