X0201 4 2004-02-20 0 0000874716 IDEXX LABORATORIES INC /DE IDXX 0001184149 AYERS JONATHAN W ONE IDEXX DRIVE WESTBROOK ME 04092 1 1 0 0 President and CEO Common Stock 2004-02-20 2004-02-20 4 A 0 5431 50.26 A 31099 D Represents deferred stock units acquired pursuant to the IDEXX Laboratories, Inc. Executive Deferred Compensation Plan (the "Plan") in accordance with Rule 16b-3. The number of deferred stock units acquired is determined by dividing the amount of cash compensation deferred pursuant to the Plan ($273,000) by the closing price of the IDEXX Laboratories, Inc. Common Stock on the date of the deferral. Deferred stock units are issuable only as common stock on a one-for-one basis one year following the Executive's resignation from IDEXX. Conan R. Deady, Attorney-in-Fact for Jonathan W. Ayers 2004-02-23