Ownership Submission
FORM 4
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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(Print or Type Responses)
1. Name and Address of Reporting Person *
Williams Michael J PhD
   2. Issuer Name and Ticker or Trading Symbol
IDEXX LABORATORIES INC /DE [IDXX] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director _____ 10% Owner
__X__ Officer (give title below) _____ Other (specify below)
Corporate Vice President
(Last)
(First)
(Middle)
ONE IDEXX DRIVE		 3. Date of Earliest Transaction (Month/Day/Year)
04/28/2011
(Street)

WESTBROOK, ME 04092		 4. If Amendment, Date Original Filed(Month/Day/Year)
 6. Individual or Joint/Group Filing(Check Applicable Line)
_X_ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3)		 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code
(Instr. 8)		 4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)		 5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4)		 6. Ownership Form: Direct (D) or Indirect (I)
(Instr. 4)		 7. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V Amount (A) or (D) Price
Common Stock 04/28/2011   M   7,000 A $ 28.655 16,154 (1) D  
Common Stock 04/28/2011   M   3,844 A $ 38.335 19,998 D  
Common Stock 04/28/2011   M   1,678 A $ 38.335 21,676 D  
Common Stock 04/28/2011   S   12,522 D $ 80.8954 (2) 9,154 D  

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 3)		 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction Code
(Instr. 8)		 5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4, and 5)		 6. Date Exercisable and Expiration Date
(Month/Day/Year)		 7. Title and Amount of Underlying Securities
(Instr. 3 and 4)		 8. Price of Derivative Security
(Instr. 5)		 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 4)		 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 4)		 11. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Non-Qualified Stock Option (right to buy) $ 28.655 04/28/2011   M     7,000   (3) 02/02/2015 Common Stock 7,000 $ 0 2,806 D  
Non-Qualified Stock Option (right to buy) $ 38.335 04/28/2011   M     3,844   (4) 02/13/2013 Common Stock 3,844 $ 0 0 D  
Incentive Stock Option (right to buy) $ 38.335 04/28/2011   M     1,678   (5) 02/13/2013 Common Stock 1,678 $ 0 0 D  

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
Williams Michael J PhD
ONE IDEXX DRIVE
WESTBROOK, ME 04092		       Corporate Vice President  

Signatures

 John B. Rogers, Attorney-in-Fact for Michael J. Williams, PhD   04/29/2011
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1) Includes 89 shares acquired under the IDEXX Laboratories, Inc. Employee Stock Purchase Plan on 03/31/2011.
(2) The sale price reported reflects the weighted average sale price of multiple transactions on the reported date at prices that ranged from $80.83 to $80.95, 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.
(3) Grant of options to buy shares of common stock becomes exercisable as to 2,720 shares on 02/03/2006, 02/03/2007 and 2/3/2008, and the remaining 1,646 shares on 02/03/2009.
(4) Grant of options to buy shares of common stock becomes exercisable as to 1,106 shares on 02/14/2007, 1,104 shares on 02/14/2008 and 02/14/2009, and the remaining 530 shares on 02/14/2010.
(5) Grant of options to buy shares of common stock becomes exercisable as to 574 shares on 02/14/2010 and the remaining 1,104 shares on 02/14/2011.

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