Form: 4

Statement of changes in beneficial ownership of securities

October 27, 2003

SEC Form 4
FORM 4 UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP


Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940
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Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
1. Name and Address of Reporting Person*
TONELLI QUENTIN J

(Last) (First) (Middle)
ONE IDEXX DRIVE

(Street)
WESTBROOK ME 04092

(City) (State) (Zip)
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)
Vice President
3. Date of Earliest Transaction (Month/Day/Year)
10/24/2003
4. If Amendment, Date of 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
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 10/24/2003 M 3,000 A $17.35 14,490 D
Common Stock 10/24/2003 M 1,500 A $17.35 15,990 D
Common Stock 10/24/2003 M 4,710 A $19.25 20,700 D
Common Stock 10/24/2003 M 200 A $22.5 20,900 D
Common Stock 10/24/2003 M 5,826 A $15 26,726 D
Common Stock 10/24/2003 M 200 A $14.375 26,926 D
Common Stock 10/24/2003 S 15,436 D $47.0862 11,490(1) D
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 Securities Underlying Derivative Security (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: 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
Incentive Stock Option (right to buy) $14.375 10/24/2003 M 200 (2) 12/15/2003 Common Stock 200 $14.375 0 D
Incentive Stock Option (right to buy) $15 10/24/2003 M 5,826 (3) 02/22/2004 Common Stock 5,826 $15 0 D
Incentive Stock Option (right to buy) $17.35 10/24/2003 M 1,500 (4) 02/13/2006 Common Stock 1,500 $17.35 1,651 D
Incentive Stock Option (right to buy) $17.35 10/24/2003 M 3,000 (5) 02/04/1997 Common Stock 3,000 $17.35 0 D
Incentive Stock Option (right to buy) $19.25 10/24/2003 M 4,710 (6) 02/08/2005 Common Stock 4,710 $19.25 0 D
Incentive Stock Option (right to buy) $22.5 10/24/2003 M 200 (7) 05/26/2005 Common Stock 200 $22.5 0 D
Explanation of Responses:
1. Reporting person also indirectly holds 5,046 shares of Common Stock of IDEXX Laboratories, Inc., which shares are held by the Andrew Q. Tonelli UTMA and Bret C. Tonelli UTMA. Reporting person disclaims beneficial ownership of these shares and this report should not be deemed an admission that the reporting person is the beneficial owner of such shares for purposes of Section 16 or any other purpose.
2. Grant of option to buy shares of Common Stock exercisable in annual increments of 40 shares on the first anniversay of the date of grant (12/15/93).
3. Grant of option to buy shares of Common Stock exercisable as to 664 shares on 2/22/95 and 2/22/96; 1,298 shares on 2/22/97 and 1,600 shares on 2/22/98 and 2/22/99.
4. Grant of option to buy shares of Common Stock exercisable as to 1 share on 2/13/97 and 1,050 shares on 2/13/99, 2/13/00 and 2/13/01.
5. Grant of option to buy shares of Common Stock exercisable as to 750 shares on 2/04/99, 2/04/00, 2/04/01 and 2/04/02.
6. Grant of option to buy shares of Common Stock exercisable as to 710 shares on 2/08/98 and 2,000 shares on 2/08/99 and 2/08/00.
7. Grant of option to buy shares of Common Stock exercisable as to 100 shares on 5/26/99 and 5/26/00.
Conan R. Deady, Attorney-in-Fact for Quentin J. Tonelli 10/27/2003
** Signature of Reporting Person Date

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* 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).

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.

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