Sec Form 3 Filing - Emerson Andrew @ IDEXX LABORATORIES INC /DE - 2025-03-01

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 Emerson Andrew 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) EVP, CFO and Treasurer (Last) (First) (Middle) ONE IDEXX DRIVE 3. Date of Earliest Transaction (MM/DD/YY) 03/01/2025 (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 2,396.436 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 61 D Restricted Stock Unit ( 2 ) ( 2 ) ( 2 ) Common Stock 187 D Restricted Stock Unit ( 3 ) ( 3 ) ( 3 ) Common Stock 125 D Restricted Stock Unit ( 4 ) ( 4 ) ( 4 ) Common Stock 775 D Restricted Stock Unit ( 5 ) ( 5 ) ( 5 ) Common Stock 258 D Incentive Stock Option (right-to-buy) $ 141.6 ( 6 ) 02/13/2027 Common Stock 1,849 D Incentive Stock Option (right-to-buy) $ 178.26 ( 7 ) 02/13/2028 Common Stock 1,190 D Non-Qualified Stock Option (right-to-buy) $ 206.94 ( 8 ) 02/13/2029 Common Stock 586 D Incentive Stock Option (right-to-buy) $ 206.94 ( 9 ) 02/13/2029 Common Stock 515 D Non-Qualified Stock Option (right-to-buy) $ 288.78 ( 10 ) 02/13/2030 Common Stock 662 D Incentive Stock Option (right-to-buy) $ 288.78 ( 11 ) 02/13/2030 Common Stock 229 D Non-Qualified Stock Option (right-to-buy) $ 544.08 ( 12 ) 02/13/2031 Common Stock 230 D Incentive Stock Option (right-to-buy) $ 544.08 ( 13 ) 02/13/2031 Common Stock 183 D Non-Qualified Stock Option (right-to-buy) $ 505.53 ( 14 ) 02/13/2032 Common Stock 546 D Incentive Stock Option (right-to-buy) $ 505.53 ( 15 ) 02/13/2032 Common Stock 182 D Non-Qualified Stock Option (right-to-buy) $ 497.43 ( 16 ) 02/13/2033 Common Stock 703 D Incentive Stock Option (right-to-buy) $ 497.43 ( 17 ) 02/13/2033 Common Stock 217 D Non-Qualified Stock Option (right-to-buy) $ 560.56 ( 18 ) 02/13/2034 Common Stock 598 D Incentive Stock Option (right-to-buy) $ 560.56 ( 19 ) 02/13/2034 Common Stock 178 D Non-Qualified Stock Option (right-to-buy) $ 459.76 ( 20 ) 02/12/2035 Common Stock 4,383 D Incentive Stock Option (right-to-buy) $ 459.76 ( 21 ) 02/12/2035 Common Stock 217 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Emerson Andrew ONE IDEXX DRIVE WESTBROOK, ME04092 EVP, CFO and Treasurer Signatures /s/ Andrew Emerson 03/10/2025 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Remainder of a grant of 247 restricted stock units ('RSU'). Each RSU represents a contingent right to receive one share of Issuer common stock and vests in four annual installments beginning on February 14, 2023. ( 2 )Remainder of a grant of 377 RSUs. Each RSU represents a contingent right to receive one share of Issuer common stock and vests in four annual installments beginning on February 14, 2024. ( 3 )Remainder of a grant of 167 RSUs. Each RSU represents a contingent right to receive one share of Issuer common stock and vests in four annual installments beginning on February 14, 2025. ( 4 )Each RSU represents a contingent right to receive one share of Issuer common stock and vests in four annual installments beginning on February 14, 2026. ( 5 )RSU grant that upon vesting, will be deferred and recorded in an account under the Issuer's Deferred Compensation Plan. This RSU grant vests in four annual installments, beginning February 14, 2026. ( 6 )Grant of option to buy 1,849 shares of Issuer common stock that vested on February 14, 2022. ( 7 )Grant of option to buy 1,190 shares of Issuer common stock that vested on February 14, 2023. ( 8 )Grant of option to buy 586 shares of Issuer common stock that vested in five annual installments beginning on February 14, 2020. ( 9 )Grant of option to buy 515 shares of Issuer common stock that vested on February 14, 2024. ( 10 )Grant of option to buy 662 shares of Issuer common stock that vested in four annual installments beginning on February 14, 2021. ( 11 )Grant of option to buy 229 shares of Issuer common stock that vested on February 14, 2025. ( 12 )Grant of option to buy 230 shares of Issuer common stock that vested in four annual installments beginning on February 14, 2022. ( 13 )Grant of option to buy 183 shares of Issuer common stock that vested on February 14, 2025. ( 14 )Grant of option to buy 546 shares of Issuer common stock that vests in four annual installments beginning on February 14, 2023. ( 15 )Grant of option to buy 182 shares of Issuer common stock that vests on February 14, 2026. ( 16 )Grant of option to buy 703 shares of Issuer common stock that vests in four annual installments beginning on February 14, 2024. ( 17 )Grant of option to buy 217 shares of Issuer common stock that vests on February 14, 2027. ( 18 )Grant of option to buy 598 shares of Issuer common stock that vests in four annual installments beginning on February 14, 2025. ( 19 )Grant of option to buy 178 shares of Issuer common stock that vests on February 14, 2028. ( 20 )Grant of option to buy 4,383 sh ares of Issuer common stock that vests in four annual installments beginning on February 14, 2026. ( 21 )Grant of option to buy 217 shares of Issuer common stock that vests on February 14, 2029.

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).

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