Sec Form 3 Filing - FENNELL GEORGE @ IDEXX LABORATORIES INC /DE - 2024-01-01

FORM 3 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 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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1. Name and Address of Reporting Person FENNELL GEORGE 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) SVP, Chief Revenue Officer (Last) (First) (Middle) ONE IDEXX DRIVE 3. Date of Earliest Transaction (MM/DD/YY) 01/01/2024 (Street) WESTBROOK, ME04092 4. If Amendment, Date Original Filed (MM/DD/YY) 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 (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 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 5,100 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 (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 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 (MM/DD/YY) 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 Restricted Stock Unit ( 1 ) ( 1 ) ( 1 ) Common Stock 108 D Restricted Stock Unit ( 2 ) ( 2 ) ( 2 ) Common Stock 97 D Restricted Stock Unit ( 3 ) ( 3 ) ( 3 ) Common Stock 103 D Restricted Stock Unit ( 4 ) ( 4 ) ( 4 ) Common Stock 167 D Restricted Stock Unit ( 5 ) ( 5 ) ( 5 ) Common Stock 225 D Restricted Stock Unit ( 6 ) ( 6 ) ( 6 ) Common Stock 639 D Incentive Stock Option (right-to-buy) $ 62 ( 7 ) 02/13/2024 Common Stock 1,612 D Non-Qualified Stock Option (right-to-buy) $ 62 ( 8 ) 02/13/2024 Common Stock 8,198 D Incentive Stock Option (right-to-buy) $ 79.54 ( 9 ) 02/13/2025 Common Stock 1,256 D Non-Qualified Stock Option (right-to-buy) $ 79.54 ( 10 ) 02/13/2025 Common Stock 9,986 D Incentive Stock Option (right-to-buy) $ 67.85 ( 11 ) 02/13/2026 Common Stock 1,476 D Non-Qualified Stock Option (right-to-buy) $ 67.85 ( 12 ) 02/13/2026 Common Stock 11,345 D Non-Qualified Stock Option (right-to-buy) $ 141.6 ( 13 ) 02/13/2027 Common Stock 5,302 D Incentive Stock Option (right-to-buy) $ 141.6 ( 14 ) 02/13/2027 Common Stock 706 D Non-Qualified Stock Option (right-to-buy) $ 178.26 ( 15 ) 02/13/2028 Common Stock 4,437 D Incentive Stock Option (right-to-buy) $ 178.26 ( 16 ) 02/13/2028 Common Stock 560 D Non-Qualified Stock Option (right-to-buy) $ 206.94 ( 17 ) 02/13/2029 Common Stock 4,826 D Incentive Stock Option (right-to-buy) $ 206.94 ( 18 ) 02/13/2029 Common Stock 483 D Non-Qualified Stock Option (right-to-buy) $ 299.78 ( 19 ) 02/13/2030 Common Stock 4,008 D Non-Qualified Stock Option (right-to-buy) $ 544.08 ( 20 ) 02/13/2031 Common Stock 1,805 D Incentive Stock Option (right-to-buy) $ 544.08 ( 21 ) 02/13/2031 Common Stock 183 D Non-Qualified Stock Option (right-to-buy) $ 505.53 ( 22 ) 02/13/2032 Common Stock 1,768 D Incentive Stock Option (right-to-buy) $ 505.53 ( 23 ) 02/13/2032 Common Stock 197 D Non-Qualified Stock Option (right-to-buy) $ 497.43 ( 24 ) 02/13/2033 Common Stock 1,454 D Incentive Stock Option (right-to-buy) $ 497.43 ( 25 ) 02/13/2033 Common Stock 201 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other FENNELL GEORGE ONE IDEXX DRIVE WESTBROOK, ME04092 SVP, Chief Revenue Officer Signatures /s/ George Fennell 01/05/2024 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Grant of 544 restricted stock units ('RSU'). Each RSU represents a contingent right to receive one share of Issuer common stock and vest in five equal annual installments beginning on February 14, 2020. ( 2 )Grant of 390 RSUs. Each RSU represents a contingent right to receive one share of Issuer common stock and vest in four equal annual installments beginning on February 14, 2021. ( 3 )Grant of 207 RSUs. Each RSU represents a contingent right to receive one share of Issuer. common stock and vest in four equal annual installments beginning on February 14, 2022. ( 4 )Grant of 223 RSUs. Each RSU represents a contingent right to receive one share of Issuer common stock and vests in four equal annual installments beginning ion February 14, 2023. ( 5 )Grant of 226 RSUs. Each RSU represents a contingent right to receive one share of Issuer common stock and vest in four equal annual installments beginning on February 14, 2024. ( 6 )Grant of 639 RSUs. Each RSU represents a contingent right to receive one share of Issuer common stock and vests in one installment on June 1, 2026. ( 7 )Grant of option to buy 806 shares of Issuer common stock that vested in one installment on February 14, 2019, without giving effect to a 2-for-1 stock split in the form of a 100% stock dividend on IDEXX Laboratories, Inc. common stock paid on June 15, 2015 (the Stock Split). The number of derivative securities reported as beneficially owned and price with respect to this option were adjusted to reflect the Stock Split. ( 8 )Grant of option to buy 8,198 shares of Issuer common stock that vested in five annual installments beginning on February 14, 2015, without giving effect to the Stock Split. The number of derivative securities reported as beneficially owned and price with respect to this option were adjusted to reflect the Stock Split. ( 9 )Grant of option to buy 628 shares of Issuer common stock that vested in one installment on February 14, 2020, without giving effect to the Stock Split. The number of derivative securities reported as beneficially owned and price with respect to this option were adjusted to reflect the Stock Split. ( 10 )Grant of option to buy 9,986 shares of Issuer common stock that vested in five annual installments beginning on February 14, 2016, without giving effect to the Stock Split. The number of derivative securities reported as beneficially owned and price with respect to this option were adjusted to reflect the Stock Split. ( 11 )Grant of option to buy 1,476 shares of Issuer common stock that vested on February 14, 2021. ( 12 )Grant of option to buy 11,345 shares of Issuer common stock that vested in five annual installments beginning on February 14, 2017. ( 13 )Grant of option to buy 5,302 shares of Issuer common stock that vested in five annual installments beginning on February 14, 2018. ( 14 )Grant of option to buy 706 shares of Issuer common stock that vested in one installment on February 14, 2022. ( 15 )Grant of option to buy 4,437 shares of Issuer common stock that vested in five annual installments beginning on February 14, 2019. ( 16 )Grant of option to buy 560 shares of Issuer common stock that vested in one installment on February 14, 2023. ( 17 )Grant of option to buy 4,826 shares of Issuer common stock that vests in five annual installments beginning on February 14, 2020. ( 18 )Grant of option to buy 483 shares of Issuer common stock that vests in one installment on February 14, 2024. ( 19 )Grant of option to buy 4,008 shares of Issuer common stock that vests in four annual installments beginning on February 14, 2021. ( 20 )Grant of option to buy 1,805 shares of Issuer common stock that vests in four annual installments beginning on February 14, 2022. ( 21 )Grant of option to buy 183 shares of Issuer common stock that vests in one installment on February 14, 2025. ( 22 )Grant of option to buy 1,768 shares of Issuer common stock that vests in four annual installments beginning on February 14, 2023. ( 23 )Grant of option to buy 197 shares of Issuer common stock that vests in one installment on February 14, 2026. ( 24 )Grant of option to buy 1,454 shares of Issuer common stock that vests in four annual installments beginning on February 14, 2024. ( 25 )Grant of option to buy 201 shares of Issuer common stock that vests in one installment on February 14, 2027.

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).

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