IDXX

SEC source: 0000874716-26-000127 · wk-form4_1788987605.xml · derivative · entry 3

Kingsley Lawrence D · CIK 0001301427 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 2,203 shares

Expires 2026-11-30

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · price: Not applicable.

F2 · derivative.exercise_date: Grant of option to buy shares of IDEXX Laboratories, Inc. common stock that vested in one installment on May 3, 2017.

SEC source: 0000874716-26-000127 · wk-form4_1788987605.xml · nonDerivative · entry 2

Kingsley Lawrence D · CIK 0001301427 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 9,568

F1 · price: Represents the weighted average price of the shares sold ranging from a low of $531.88 to a high of $532.14 per share. The undersigned undertakes, upon request by the Commission staff, the issuer or a security holder of the issuer, to provide full information regarding the number of shares purchased at each separate price.

SEC source: 0000874716-26-000127 · wk-form4_1788987605.xml · nonDerivative · entry 1

Kingsley Lawrence D · CIK 0001301427 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 11,771

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0000874716-26-000125 · wk-form4_1787605205.xml · derivative · entry 3

Emerson Andrew · CIK 0002058587 · EVP, CFO and Treasurer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 925

Underlying: Common Stock · 265 shares

Expires 2028-02-13

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · price: Not applicable

F2 · derivative.exercise_date: Grant of option to buy 1,190 shares of Issuer common stock that became exercisable in one installment on February 14, 2023.

SEC source: 0000874716-26-000125 · wk-form4_1787605205.xml · nonDerivative · entry 2

Emerson Andrew · CIK 0002058587 · EVP, CFO and Treasurer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,421.444

SEC source: 0000874716-26-000125 · wk-form4_1787605205.xml · nonDerivative · entry 1

Emerson Andrew · CIK 0002058587 · EVP, CFO and Treasurer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,507.444

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · balance_after: Includes a total of 20 shares purchased under the Issuer Employee Stock Purchase Plan on March 31, 2026 and June 30, 2026.

SEC source: 0000874716-26-000117 · wk-form4_1785790805.xml · nonDerivative · entry 1

HOOLEY JOSEPH L · CIK 0001123847 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 325

F1 · shares: Represents deferred stock units acquired pursuant to the IDEXX Laboratories, Inc. Director Deferred Compensation Plan (the 'Plan') in accordance with Rule 16b-3. The number of deferred stock units, rounded up or down to the nearest whole unit, is determined by dividing the amount of cash compensation deferred pursuant to the Plan ($27,280.22) by the closing price of IDEXX Laboratories, Inc. common stock on the date of the deferral, or if no such price is reported for that date, the closing price for the next preceding date for which such price was reported. Each deferred stock unit represents a contingent right to receive one share of IDEXX Laboratories, Inc. common stock. The deferred stock units vest immediately upon grant and are payable only as common stock as soon as practicable following the Director's resignation from the Board of Directors or on such other nondiscretionary and objectively determinable date(s) selected in accordance with the terms of the Plan.

SEC source: 0000874716-26-000114 · wk-form4_1780434004.xml · derivative · entry 3

FENNELL GEORGE · CIK 0001521861 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 639 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Each Restricted Stock Unit represents a contingent right to receive one share of Issuer common stock and vested in one installment on June 1, 2026.

F2 · price: Not applicable.

F1 · derivative.exercise_date: Each Restricted Stock Unit represents a contingent right to receive one share of Issuer common stock and vested in one installment on June 1, 2026.

F1 · derivative.expiration_date: Each Restricted Stock Unit represents a contingent right to receive one share of Issuer common stock and vested in one installment on June 1, 2026.

SEC source: 0000874716-26-000114 · wk-form4_1780434004.xml · nonDerivative · entry 2

FENNELL GEORGE · CIK 0001521861 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 10,433

SEC source: 0000874716-26-000114 · wk-form4_1780434004.xml · nonDerivative · entry 1

FENNELL GEORGE · CIK 0001521861 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 10,717

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0000874716-26-000107 · wk-form4_1778792458.xml · derivative · entry 2

Vandebroek Sophie V. · CIK 0001442078 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 234

Underlying: Common Stock · 234 shares

Expires not disclosed

F2 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of Issuer common stock. These restricted stock units vest in one installment on the one year anniversary of the date of grant or on the date of the 2027 annual meeting of shareholders, whichever event is earlier.

F2 · derivative.exercise_date: Each restricted stock unit represents a contingent right to receive one share of Issuer common stock. These restricted stock units vest in one installment on the one year anniversary of the date of grant or on the date of the 2027 annual meeting of shareholders, whichever event is earlier.

F2 · derivative.expiration_date: Each restricted stock unit represents a contingent right to receive one share of Issuer common stock. These restricted stock units vest in one installment on the one year anniversary of the date of grant or on the date of the 2027 annual meeting of shareholders, whichever event is earlier.

SEC source: 0000874716-26-000107 · wk-form4_1778792458.xml · derivative · entry 1

Vandebroek Sophie V. · CIK 0001442078 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 525

Underlying: Common Stock · 525 shares

Expires 2036-05-11

F1 · derivative.exercise_date: Grant of option to buy shares of Issuer common stock that vest in one installment on the one year anniversary of the date of grant or on the date of the 2027 annual meeting of shareholders, whichever event is earlier.

SEC source: 0000874716-26-000106 · wk-form4_1778792452.xml · derivative · entry 2

SAMAD SAM · CIK 0001694295 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,354

Underlying: Common Stock · 234 shares

Expires not disclosed

F2 · derivative.exercise_price: Each deferred stock unit represents a contingent right to receive one share of Issuer common stock. These deferred stock units vest in one installment on the one year anniversary of the date of grant or on the date of the 2027 annual meeting of shareholders, whichever event is earlier, and by default are payable as common stock as soon as practicable following the date of the Director's resignation from the Board of Directors.

F2 · derivative.exercise_date: Each deferred stock unit represents a contingent right to receive one share of Issuer common stock. These deferred stock units vest in one installment on the one year anniversary of the date of grant or on the date of the 2027 annual meeting of shareholders, whichever event is earlier, and by default are payable as common stock as soon as practicable following the date of the Director's resignation from the Board of Directors.

F2 · derivative.expiration_date: Each deferred stock unit represents a contingent right to receive one share of Issuer common stock. These deferred stock units vest in one installment on the one year anniversary of the date of grant or on the date of the 2027 annual meeting of shareholders, whichever event is earlier, and by default are payable as common stock as soon as practicable following the date of the Director's resignation from the Board of Directors.

SEC source: 0000874716-26-000106 · wk-form4_1778792452.xml · derivative · entry 1

SAMAD SAM · CIK 0001694295 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 525

Underlying: Common Stock · 525 shares

Expires 2036-05-11

F1 · derivative.exercise_date: Grant of option to buy shares of Issuer common stock that vest in one installment on the one year anniversary of the date of grant or on the date of the 2027 annual meeting of shareholders, whichever event is earlier.

SEC source: 0000874716-26-000105 · wk-form4_1778792446.xml · derivative · entry 2

Peacock Karen · CIK 0001786299 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 234

Underlying: Common Stock · 234 shares

Expires not disclosed

F2 · derivative.exercise_price: Each deferred stock unit represents a contingent right to receive one share of Issuer common stock. These deferred stock units vest in one installment on the one year anniversary of the date of grant or on the date of the 2027 annual meeting of shareholders, whichever event is earlier, and by default are payable as common stock as soon as practicable following the date of the Director's resignation from the Board of Directors.

F2 · derivative.exercise_date: Each deferred stock unit represents a contingent right to receive one share of Issuer common stock. These deferred stock units vest in one installment on the one year anniversary of the date of grant or on the date of the 2027 annual meeting of shareholders, whichever event is earlier, and by default are payable as common stock as soon as practicable following the date of the Director's resignation from the Board of Directors.

F2 · derivative.expiration_date: Each deferred stock unit represents a contingent right to receive one share of Issuer common stock. These deferred stock units vest in one installment on the one year anniversary of the date of grant or on the date of the 2027 annual meeting of shareholders, whichever event is earlier, and by default are payable as common stock as soon as practicable following the date of the Director's resignation from the Board of Directors.

SEC source: 0000874716-26-000105 · wk-form4_1778792446.xml · derivative · entry 1

Peacock Karen · CIK 0001786299 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 525

Underlying: Common Stock · 525 shares

Expires 2036-05-11

F1 · derivative.exercise_date: Grant of option to buy shares of Issuer common stock that vest in one installment on the one year anniversary of the date of grant or on the date of the 2027 annual meeting of shareholders, whichever event is earlier.

SEC source: 0000874716-26-000104 · wk-form4_1778792440.xml · derivative · entry 4

Kingsley Lawrence D · CIK 0001301427 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 75

Underlying: Common Stock · 75 shares

Expires not disclosed

F3 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of Issuer common stock. These restricted stock units vest in one installment on the one year anniversary of the date of grant or on the date of the 2027 annual meeting of shareholders, whichever event is earlier.

F2 · shares: Additional grant as Lead Director.

F3 · derivative.exercise_date: Each restricted stock unit represents a contingent right to receive one share of Issuer common stock. These restricted stock units vest in one installment on the one year anniversary of the date of grant or on the date of the 2027 annual meeting of shareholders, whichever event is earlier.

F3 · derivative.expiration_date: Each restricted stock unit represents a contingent right to receive one share of Issuer common stock. These restricted stock units vest in one installment on the one year anniversary of the date of grant or on the date of the 2027 annual meeting of shareholders, whichever event is earlier.

SEC source: 0000874716-26-000104 · wk-form4_1778792440.xml · derivative · entry 3

Kingsley Lawrence D · CIK 0001301427 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 234

Underlying: Common Stock · 234 shares

Expires not disclosed

F3 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of Issuer common stock. These restricted stock units vest in one installment on the one year anniversary of the date of grant or on the date of the 2027 annual meeting of shareholders, whichever event is earlier.

F3 · derivative.exercise_date: Each restricted stock unit represents a contingent right to receive one share of Issuer common stock. These restricted stock units vest in one installment on the one year anniversary of the date of grant or on the date of the 2027 annual meeting of shareholders, whichever event is earlier.

F3 · derivative.expiration_date: Each restricted stock unit represents a contingent right to receive one share of Issuer common stock. These restricted stock units vest in one installment on the one year anniversary of the date of grant or on the date of the 2027 annual meeting of shareholders, whichever event is earlier.

SEC source: 0000874716-26-000104 · wk-form4_1778792440.xml · derivative · entry 2

Kingsley Lawrence D · CIK 0001301427 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 168

Underlying: Common Stock · 168 shares

Expires 2036-05-11

F2 · shares: Additional grant as Lead Director.

F1 · derivative.exercise_date: Grant of option to buy shares of Issuer common stock that vest in one installment on the one year anniversary of the date of grant or on the date of the 2027 annual meeting of shareholders, whichever event is earlier.

SEC source: 0000874716-26-000104 · wk-form4_1778792440.xml · derivative · entry 1

Kingsley Lawrence D · CIK 0001301427 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 525

Underlying: Common Stock · 525 shares

Expires 2036-05-11

F1 · derivative.exercise_date: Grant of option to buy shares of Issuer common stock that vest in one installment on the one year anniversary of the date of grant or on the date of the 2027 annual meeting of shareholders, whichever event is earlier.

SEC source: 0000874716-26-000103 · wk-form4_1778792434.xml · derivative · entry 2

JUNIUS DANIEL M · CIK 0001094159 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 234

Underlying: Common Stock · 234 shares

Expires not disclosed

F2 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of Issuer common stock. These restricted stock units vest in one installment on the one year anniversary of the date of grant or on the date of the 2027 annual meeting of shareholders, whichever event is earlier.

F2 · derivative.exercise_date: Each restricted stock unit represents a contingent right to receive one share of Issuer common stock. These restricted stock units vest in one installment on the one year anniversary of the date of grant or on the date of the 2027 annual meeting of shareholders, whichever event is earlier.

F2 · derivative.expiration_date: Each restricted stock unit represents a contingent right to receive one share of Issuer common stock. These restricted stock units vest in one installment on the one year anniversary of the date of grant or on the date of the 2027 annual meeting of shareholders, whichever event is earlier.

SEC source: 0000874716-26-000103 · wk-form4_1778792434.xml · derivative · entry 1

JUNIUS DANIEL M · CIK 0001094159 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 525

Underlying: Common Stock · 525 shares

Expires 2036-05-11

F1 · derivative.exercise_date: Grant of option to buy shares of Issuer common stock that vest in one installment on the one year anniversary of the date of grant or on the date of the 2027 annual meeting of shareholders, whichever event is earlier.

SEC source: 0000874716-26-000102 · wk-form4_1778792428.xml · derivative · entry 2

HOOLEY JOSEPH L · CIK 0001123847 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 234

Underlying: Common Stock · 234 shares

Expires not disclosed

F2 · derivative.exercise_price: Each deferred stock unit represents a contingent right to receive one share of Issuer common stock. These deferred stock units vest in one installment on the one year anniversary of the date of grant or on the date of the 2027 annual meeting of shareholders, whichever event is earlier, and by default are payable as common stock as soon as practicable following the date of the Director's resignation from the Board of Directors.

F2 · derivative.exercise_date: Each deferred stock unit represents a contingent right to receive one share of Issuer common stock. These deferred stock units vest in one installment on the one year anniversary of the date of grant or on the date of the 2027 annual meeting of shareholders, whichever event is earlier, and by default are payable as common stock as soon as practicable following the date of the Director's resignation from the Board of Directors.

F2 · derivative.expiration_date: Each deferred stock unit represents a contingent right to receive one share of Issuer common stock. These deferred stock units vest in one installment on the one year anniversary of the date of grant or on the date of the 2027 annual meeting of shareholders, whichever event is earlier, and by default are payable as common stock as soon as practicable following the date of the Director's resignation from the Board of Directors.

SEC source: 0000874716-26-000102 · wk-form4_1778792428.xml · derivative · entry 1

HOOLEY JOSEPH L · CIK 0001123847 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 525

Underlying: Common Stock · 525 shares

Expires 2036-05-11

F1 · derivative.exercise_date: Grant of option to buy shares of Issuer common stock that vest in one installment on the one year anniversary of the date of grant or on the date of the 2027 annual meeting of shareholders, whichever event is earlier.

SEC source: 0000874716-26-000101 · wk-form4_1778792420.xml · derivative · entry 2

ESSIG STUART · CIK 0001187574 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 234

Underlying: Common Stock · 234 shares

Expires not disclosed

F2 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of Issuer common stock. These restricted stock units vest in one installment on the one year anniversary of the date of grant or on the date of the 2027 annual meeting of shareholders, whichever event is earlier.

F2 · derivative.exercise_date: Each restricted stock unit represents a contingent right to receive one share of Issuer common stock. These restricted stock units vest in one installment on the one year anniversary of the date of grant or on the date of the 2027 annual meeting of shareholders, whichever event is earlier.

F2 · derivative.expiration_date: Each restricted stock unit represents a contingent right to receive one share of Issuer common stock. These restricted stock units vest in one installment on the one year anniversary of the date of grant or on the date of the 2027 annual meeting of shareholders, whichever event is earlier.

SEC source: 0000874716-26-000101 · wk-form4_1778792420.xml · derivative · entry 1

ESSIG STUART · CIK 0001187574 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 525

Underlying: Common Stock · 525 shares

Expires 2036-05-11

F1 · derivative.exercise_date: Grant of option to buy shares of Issuer common stock that vest in one installment on the one year anniversary of the date of grant or on the date of the 2027 annual meeting of shareholders, whichever event is earlier.

SEC source: 0000874716-26-000100 · wk-form4_1778792415.xml · derivative · entry 2

Claflin Bruce L. · CIK 0001403694 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,354

Underlying: Common Stock · 234 shares

Expires not disclosed

F2 · derivative.exercise_price: Each deferred stock unit represents a contingent right to receive one share of Issuer common stock. These deferred stock units vest in one installment on the one year anniversary of the date of grant or on the date of the 2027 annual meeting of shareholders, whichever event is earlier, and by default are payable as common stock as soon as practicable following the date of the Director's resignation from the Board of Directors.

F2 · derivative.exercise_date: Each deferred stock unit represents a contingent right to receive one share of Issuer common stock. These deferred stock units vest in one installment on the one year anniversary of the date of grant or on the date of the 2027 annual meeting of shareholders, whichever event is earlier, and by default are payable as common stock as soon as practicable following the date of the Director's resignation from the Board of Directors.

F2 · derivative.expiration_date: Each deferred stock unit represents a contingent right to receive one share of Issuer common stock. These deferred stock units vest in one installment on the one year anniversary of the date of grant or on the date of the 2027 annual meeting of shareholders, whichever event is earlier, and by default are payable as common stock as soon as practicable following the date of the Director's resignation from the Board of Directors.

SEC source: 0000874716-26-000100 · wk-form4_1778792415.xml · derivative · entry 1

Claflin Bruce L. · CIK 0001403694 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 525

Underlying: Common Stock · 525 shares

Expires 2036-05-11

F1 · derivative.exercise_date: Grant of option to buy shares of Issuer common stock that vest in one installment on the one year anniversary of the date of grant or on the date of the 2027 annual meeting of shareholders, whichever event is earlier.

SEC source: 0000874716-26-000099 · wk-form4_1778792405.xml · derivative · entry 2

Britt Irene Chang · CIK 0001502314 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 753

Underlying: Common Stock · 234 shares

Expires not disclosed

F2 · derivative.exercise_price: Each deferred stock unit represents a contingent right to receive one share of Issuer common stock. These deferred stock units vest in one installment on the one year anniversary of the date of grant or on the date of the 2027 annual meeting of shareholders, whichever event is earlier, and by default are payable as common stock as soon as practicable following the date of the Director's resignation from the Board of Directors.

F2 · derivative.exercise_date: Each deferred stock unit represents a contingent right to receive one share of Issuer common stock. These deferred stock units vest in one installment on the one year anniversary of the date of grant or on the date of the 2027 annual meeting of shareholders, whichever event is earlier, and by default are payable as common stock as soon as practicable following the date of the Director's resignation from the Board of Directors.

F2 · derivative.expiration_date: Each deferred stock unit represents a contingent right to receive one share of Issuer common stock. These deferred stock units vest in one installment on the one year anniversary of the date of grant or on the date of the 2027 annual meeting of shareholders, whichever event is earlier, and by default are payable as common stock as soon as practicable following the date of the Director's resignation from the Board of Directors.

SEC source: 0000874716-26-000099 · wk-form4_1778792405.xml · derivative · entry 1

Britt Irene Chang · CIK 0001502314 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 525

Underlying: Common Stock · 525 shares

Expires 2036-05-11

F1 · derivative.exercise_date: Grant of option to buy shares of Issuer common stock that vest in one installment on the one year anniversary of the date of grant or on the date of the 2027 annual meeting of shareholders, whichever event is earlier.

SEC source: 0000874716-26-000088 · wk-form4_1778533863.xml · derivative · entry 3

Vandebroek Sophie V. · CIK 0001442078 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 257 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of Issuer common stock that vested in one installment on May 7, 2026.

F2 · price: Not applicable.

F1 · derivative.exercise_date: Each restricted stock unit represents a contingent right to receive one share of Issuer common stock that vested in one installment on May 7, 2026.

F1 · derivative.expiration_date: Each restricted stock unit represents a contingent right to receive one share of Issuer common stock that vested in one installment on May 7, 2026.

SEC source: 0000874716-26-000088 · wk-form4_1778533863.xml · nonDerivative · entry 1

Vandebroek Sophie V. · CIK 0001442078 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 905

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0000874716-26-000087 · wk-form4_1778533854.xml · derivative · entry 4

SZOSTAK M ANNE · CIK 0001094176 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 257 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of Issuer common stock that vested in one installment on May 7, 2026.

F4 · price: Not applicable.

F3 · derivative.exercise_date: Each restricted stock unit represents a contingent right to receive one share of Issuer common stock that vested in one installment on May 7, 2026.

F3 · derivative.expiration_date: Each restricted stock unit represents a contingent right to receive one share of Issuer common stock that vested in one installment on May 7, 2026.

SEC source: 0000874716-26-000087 · wk-form4_1778533854.xml · nonDerivative · entry 1

SZOSTAK M ANNE · CIK 0001094176 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 519

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0000874716-26-000086 · wk-form4_1778533848.xml · derivative · entry 2

Peacock Karen · CIK 0001786299 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 101 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of Issuer common stock that vested in one installment on May 7, 2026.

F2 · price: Not applicable.

F1 · derivative.exercise_date: Each restricted stock unit represents a contingent right to receive one share of Issuer common stock that vested in one installment on May 7, 2026.

F1 · derivative.expiration_date: Each restricted stock unit represents a contingent right to receive one share of Issuer common stock that vested in one installment on May 7, 2026.

SEC source: 0000874716-26-000086 · wk-form4_1778533848.xml · nonDerivative · entry 1

Peacock Karen · CIK 0001786299 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 102

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0000874716-26-000085 · wk-form4_1778533840.xml · derivative · entry 4

Kingsley Lawrence D · CIK 0001301427 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 82 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of Issuer common stock that vested in one installment on May 7, 2026.

F2 · price: Not applicable.

F1 · derivative.exercise_date: Each restricted stock unit represents a contingent right to receive one share of Issuer common stock that vested in one installment on May 7, 2026.

F1 · derivative.expiration_date: Each restricted stock unit represents a contingent right to receive one share of Issuer common stock that vested in one installment on May 7, 2026.

SEC source: 0000874716-26-000085 · wk-form4_1778533840.xml · derivative · entry 3

Kingsley Lawrence D · CIK 0001301427 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 257 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of Issuer common stock that vested in one installment on May 7, 2026.

F2 · price: Not applicable.

F1 · derivative.exercise_date: Each restricted stock unit represents a contingent right to receive one share of Issuer common stock that vested in one installment on May 7, 2026.

F1 · derivative.expiration_date: Each restricted stock unit represents a contingent right to receive one share of Issuer common stock that vested in one installment on May 7, 2026.

SEC source: 0000874716-26-000085 · wk-form4_1778533840.xml · nonDerivative · entry 2

Kingsley Lawrence D · CIK 0001301427 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 9,568

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0000874716-26-000085 · wk-form4_1778533840.xml · nonDerivative · entry 1

Kingsley Lawrence D · CIK 0001301427 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 9,486

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0000874716-26-000084 · wk-form4_1778533834.xml · derivative · entry 2

JUNIUS DANIEL M · CIK 0001094159 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 257 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of Issuer common stock that vested in one installment on May 7, 2026.

F2 · price: Not applicable.

F1 · derivative.exercise_date: Each restricted stock unit represents a contingent right to receive one share of Issuer common stock that vested in one installment on May 7, 2026.

F1 · derivative.expiration_date: Each restricted stock unit represents a contingent right to receive one share of Issuer common stock that vested in one installment on May 7, 2026.

SEC source: 0000874716-26-000084 · wk-form4_1778533834.xml · nonDerivative · entry 1

JUNIUS DANIEL M · CIK 0001094159 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,561

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0000874716-26-000083 · wk-form4_1778533828.xml · derivative · entry 2

HOOLEY JOSEPH L · CIK 0001123847 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 158 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of Issuer common stock that vested in one installment on May 7, 2026.

F2 · price: Not applicable.

F1 · derivative.exercise_date: Each restricted stock unit represents a contingent right to receive one share of Issuer common stock that vested in one installment on May 7, 2026.

F1 · derivative.expiration_date: Each restricted stock unit represents a contingent right to receive one share of Issuer common stock that vested in one installment on May 7, 2026.

SEC source: 0000874716-26-000083 · wk-form4_1778533828.xml · nonDerivative · entry 1

HOOLEY JOSEPH L · CIK 0001123847 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 276

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0000874716-26-000069 · wk-form4_1777928406.xml · nonDerivative · entry 1

HOOLEY JOSEPH L · CIK 0001123847 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 118

F1 · shares: Represents deferred stock units acquired pursuant to the IDEXX Laboratories, Inc. Director Deferred Compensation Plan (the "Plan") in accordance with Rule 16b-3. The number of deferred stock units, rounded up or down to the nearest whole unit, is determined by dividing the amount of cash compensation deferred pursuant to the Plan ($24,375.00) by the closing price of IDEXX Laboratories, Inc. common stock on the date of the deferral, or if no such price is reported for that date, the closing price for the next preceding date for which such price was reported. Each deferred stock unit represents a contingent right to receive one share of IDEXX Laboratories, Inc. common stock. The deferred stock units vest immediately upon grant and are payable only as common stock as soon as practicable following the Director's resignation from the Board of Directors or on such other nondiscretionary and objectively determinable date(s) selected in accordance with the terms of the Plan.

SEC source: 0000874716-26-000050 · wk-form4_1772748092.xml · derivative · entry 2

Underberg Sharon E. · CIK 0001630353 · EVP, GC & Corporate Secretary

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 197 shares

Expires 2032-02-13

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · price: Not applicable.

F1 · derivative.exercise_date: Grant of option to buy shares of Issuer common stock that vested on February 14, 2026.

SEC source: 0000874716-26-000050 · wk-form4_1772748092.xml · nonDerivative · entry 1

Underberg Sharon E. · CIK 0001630353 · EVP, GC & Corporate Secretary

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 7,137.654

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0000874716-26-000049 · wk-form4_1772748086.xml · nonDerivative · entry 1

Hunt Nimrata · CIK 0001800619 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 18,140.944

F1 · price: Represents the weighted average price of the shares sold ranging from a low of $634.5301 to a high of $634.8201 per share. The undersigned undertakes, upon request by the Commission staff, the issuer or a security holder of the issuer, to provide full information regarding the number of shares purchased at each separate price.

SEC source: 0000874716-26-000043 · wk-form4_1772488807.xml · derivative · entry 17

MAZELSKY JONATHAN JAY · CIK 0001556270 · Director · President and CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 197 shares

Expires 2032-02-13

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F15 · derivative.exercise_date: Grant of option to buy shares of Issuer common stock that vested on February 14, 2026.

SEC source: 0000874716-26-000043 · wk-form4_1772488807.xml · nonDerivative · entry 15

MAZELSKY JONATHAN JAY · CIK 0001556270 · Director · President and CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 83,803.302

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.