IDEXX LABORATORIES INC /DE — Director's Dealing 2011

Dec 20, 2011

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: IDEXX LABORATORIES INC /DE (IDXX)
CIK: 0000874716
Period of Report: 2011-12-19

Reporting Person: AYERS JONATHAN W (Director, Chairman, President & CEO)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2011-12-19	Common Stock	M	20000	—	Acquired	332697	Direct
2011-12-19	Common Stock	S	12000	$73.4796	Disposed	320697	Direct
2011-12-19	Common Stock	S	3000	$74.2608	Disposed	317697	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2011-12-19	Non-Qualified Stock Option (right to buy)	$12.60	M	20000	Disposed	2012-01-28	Common Stock (20000)	Direct

Footnotes

F1: The sale reported above was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on 03/03/2011.

F2: The sale price reported reflects the weighted average sale price of multiple transactions on the reported date at prices that ranged from $73.13 to $74.11, 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 2 and 3 to this Form 4.

F3: The sale price reported reflects the weighted average sale price of multiple transactions on the reported date at prices that ranged from $74.16 to $74.64, inclusive.

F4: Grant of options to buy shares of common stock that vest in five equal annual installments, beginning on the first anniversary date (01/28/2003) of the date of grant.