IDXX

SEC source: 0000874716-24-000015 · wk-form4_1707516080.xml · nonDerivative · entry 4

MCKEON BRIAN P · CIK 0001219445 · EVP, CFO and Treasurer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 50,146.5926

F4 · price: Represents the weighted average price of the shares sold ranging from a low of $565.89 to a high of $566.84 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: 0000874716-24-000015 · wk-form4_1707516080.xml · nonDerivative · entry 3

MCKEON BRIAN P · CIK 0001219445 · EVP, CFO and Treasurer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 50,847.5926

F3 · price: Represents the weighted average price of the shares sold ranging from a low of $564.63 to a high of $565.50 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: 0000874716-24-000015 · wk-form4_1707516080.xml · nonDerivative · entry 2

MCKEON BRIAN P · CIK 0001219445 · EVP, CFO and Treasurer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 52,428.5926

F2 · price: Represents the weighted average price of the shares sold ranging from a low of $563.48 to a high of $564.45 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: 0000874716-24-000015 · wk-form4_1707516080.xml · nonDerivative · entry 1

MCKEON BRIAN P · CIK 0001219445 · EVP, CFO and Treasurer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 53,043.5926

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 25.247 shares purchased under the Issuer Employee Stock Purchase Plan on September 29, 2023 and December 29, 2023.

SEC source: 0000874716-24-000014 · wk-form4_1707516010.xml · derivative · entry 7

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 29,260

Underlying: Common Stock · 12,000 shares

Expires 2026-02-13

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.

F8 · price: Not applicable.

F7 · derivative.exercise_date: Grant of option to buy shares of Issuer common stock that became exercisable in four annual installments beginning February 14, 2017.

SEC source: 0000874716-24-000014 · wk-form4_1707516010.xml · nonDerivative · entry 6

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 79,246.5926

F6 · price: Represents the weighted average price of the shares sold ranging from a low of $575.35 to a high of $575.65 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: 0000874716-24-000014 · wk-form4_1707516010.xml · nonDerivative · entry 5

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 79,951.5926

F5 · price: Represents the weighted average price of the shares sold ranging from a low of $574.29 to a high of $575.19 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: 0000874716-24-000014 · wk-form4_1707516010.xml · nonDerivative · entry 4

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 81,304.5926

F4 · price: Represents the weighted average price of the shares sold ranging from a low of $573.14 to a high of $573.23 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: 0000874716-24-000014 · wk-form4_1707516010.xml · nonDerivative · entry 3

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 81,766.5926

F3 · price: Represents the weighted average price of the shares sold ranging from a low of $572.13 to a high of $573.06 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: 0000874716-24-000014 · wk-form4_1707516010.xml · nonDerivative · entry 2

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 85,890.5926

F2 · price: Represents the weighted average price of the shares sold ranging from a low of $571.12 to a high of $572.11 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: 0000874716-24-000014 · wk-form4_1707516010.xml · nonDerivative · entry 1

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 91,246.5926

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 13.247 shares purchased under the Issuer Employee Stock Purchase Plan on December 29, 2023.

SEC source: 0000874716-24-000009 · wk-form4_1706824803.xml · nonDerivative · entry 1

JUNIUS DANIEL M · CIK 0001094159 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,042

F1 · acquired: 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 ($7,500.00) 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: 0000874716-23-000145 · wk-form4_1702072812.xml · derivative · entry 8

POLEWACZYK JAMES F · CIK 0001389046 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,226

Underlying: Common Stock · 6,680 shares

Expires 2030-02-13

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.

F7 · derivative.exercise_date: Grant of option to buy 8,906 shares of Issuer common stock that vest in four annual installments beginning February 14, 2021.

SEC source: 0000874716-23-000145 · wk-form4_1702072812.xml · derivative · entry 7

POLEWACZYK JAMES F · CIK 0001389046 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 755

Underlying: Common Stock · 4,956 shares

Expires 2029-02-13

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.

F6 · derivative.exercise_date: Grant of option to buy 5,711 shares of Issuer common stock that vest in five annual installments beginning February 14, 2020.

SEC source: 0000874716-23-000145 · wk-form4_1702072812.xml · nonDerivative · entry 6

POLEWACZYK JAMES F · CIK 0001389046 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 10,049.9875

F5 · price: Represents the weighted average price of the shares sold ranging from a low of $523.05 to a high of $523.885 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: 0000874716-23-000145 · wk-form4_1702072812.xml · nonDerivative · entry 5

POLEWACZYK JAMES F · CIK 0001389046 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 13,989.9875

F4 · price: Represents the weighted average price of the shares sold ranging from a low of $521.99 to a high of $522.935 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: 0000874716-23-000145 · wk-form4_1702072812.xml · nonDerivative · entry 4

POLEWACZYK JAMES F · CIK 0001389046 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 15,191.9875

F3 · price: Represents the weighted average price of the shares sold ranging from a low of $520.74 to a high of $521.235 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: 0000874716-23-000145 · wk-form4_1702072812.xml · nonDerivative · entry 3

POLEWACZYK JAMES F · CIK 0001389046 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 18,569.9875

F2 · price: Represents the weighted average price of the shares sold ranging from a low of $519.73 to a high of $520.73 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: 0000874716-23-000145 · wk-form4_1702072812.xml · nonDerivative · entry 2

POLEWACZYK JAMES F · CIK 0001389046 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 21,685.9875

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: 0000874716-23-000145 · wk-form4_1702072812.xml · nonDerivative · entry 1

POLEWACZYK JAMES F · CIK 0001389046 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 15,005.9875

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 12 shares purchased under the Issuer's Employee Stock Purchase Plan on September 29, 2023.

SEC source: 0000874716-23-000141 · wk-form4_1701900077.xml · derivative · entry 4

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 13,424 shares

Expires 2025-02-13

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.

F5 · price: Not applicable.

F4 · derivative.exercise_date: Grant of option to buy 13,424 shares of IDEXX Laboratories, Inc. common stock that became exercisable in five annual installments beginning on February 14, 2016 without giving effect to the 2-for-1 stock split of IDEXX Laboratories, Inc. common stock that occurred on June 15, 2015 (the "Stock Split"). The number of derivative securities reported as beneficially owned with respect to this option and its exercise price were adjusted to reflect the Stock Split.

SEC source: 0000874716-23-000141 · wk-form4_1701900077.xml · nonDerivative · entry 3

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 79,233.3456

F3 · balance_after: Represents the weighted average price of the shares sold ranging from a low of $513.36 to a high of $513.76 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: 0000874716-23-000141 · wk-form4_1701900077.xml · nonDerivative · entry 2

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 80,557.3456

F2 · price: Represents the weighted average price of the shares sold ranging from a low of $512.35 to a high of $513.35 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: 0000874716-23-000141 · wk-form4_1701900077.xml · nonDerivative · entry 1

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 86,361.3456

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 12 shares purchased under the Issuer's Employee Stock Purchase Plan on September 29, 2023.

SEC source: 0000874716-23-000140 · wk-form4_1701900002.xml · nonDerivative · entry 1

AYERS JONATHAN W · CIK 0001184149 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 272,594

SEC source: 0000874716-23-000137 · wk-form4_1701468002.xml · nonDerivative · entry 1

AYERS JONATHAN W · CIK 0001184149 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 275,018

SEC source: 0000874716-23-000135 · wk-form4_1700690405.xml · nonDerivative · entry 1

AYERS JONATHAN W · CIK 0001184149 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 276,868

SEC source: 0000874716-23-000133 · wk-form4_1700178604.xml · nonDerivative · entry 1

AYERS JONATHAN W · CIK 0001184149 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 279,374

SEC source: 0000874716-23-000131 · wk-form4_1699481341.xml · derivative · entry 7

Lane Michael · CIK 0001740689 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 560 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.

F5 · derivative.exercise_date: Grant of option to buy 560 shares of Issuer common stock that vested on the fifth anniversary of the date of grant.

SEC source: 0000874716-23-000131 · wk-form4_1699481341.xml · derivative · entry 6

Lane Michael · CIK 0001740689 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 706 shares

Expires 2027-02-13

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.

F4 · derivative.exercise_date: Grant of option to buy 706 shares of Issuer common stock that vested ion the fifth anniversary of the date of grant.

SEC source: 0000874716-23-000131 · wk-form4_1699481341.xml · derivative · entry 5

Lane Michael · CIK 0001740689 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 462 shares

Expires 2026-02-13

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 · derivative.exercise_date: Grant of option to buy 2,072 shares of Issuer common stock that vested as to 1 share on February 14, 2017, February 14, 2018 and February 14, 2020, respectively, and as to the remainder on February 14, 2021.

SEC source: 0000874716-23-000131 · wk-form4_1699481341.xml · nonDerivative · entry 3

Lane Michael · CIK 0001740689 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,773.9875

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: 0000874716-23-000131 · wk-form4_1699481341.xml · nonDerivative · entry 2

Lane Michael · CIK 0001740689 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,213.9875

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: 0000874716-23-000131 · wk-form4_1699481341.xml · nonDerivative · entry 1

Lane Michael · CIK 0001740689 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,507.9875

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 12 shares purchased under the Issuer's Employee Stock Purchase Plan on September 29, 2023.

SEC source: 0000874716-23-000129 · wk-form4_1698876362.xml · nonDerivative · entry 1

JUNIUS DANIEL M · CIK 0001094159 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,028

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 ($7,500.00) 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: 0000874716-23-000123 · wk-form4_1694206826.xml · nonDerivative · entry 2

AYERS JONATHAN W · CIK 0001184149 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 281,868

SEC source: 0000874716-23-000123 · wk-form4_1694206826.xml · nonDerivative · entry 1

AYERS JONATHAN W · CIK 0001184149 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · by Jonathan W. Ayers 2022 GRAT

Disclosed balance after: 302,179

F1 · ownership.nature: The reporting person is the grantor and trustee of the Jonathan W. Ayers 2022 GRAT (the 'GRAT'). The GRAT is irrevocable, and the reporting person disclaims beneficial ownership of these shares except to the extent of his pecuniary interest therein.

SEC source: 0000874716-23-000116 · wk-form4_1693947610.xml · nonDerivative · entry 2

AYERS JONATHAN W · CIK 0001184149 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 134,047

SEC source: 0000874716-23-000121 · wk-form4_1694034061.xml · derivative · entry 3

Smith Martin Alexander · CIK 0001621358 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,827

Underlying: Common Stock · 19 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.

F2 · derivative.exercise_price: Each restricted stock unit ('RSU') represents a contingent right to receive one share of Issuer common stock. This RSU grant vests in four annual installments, beginning September 1, 2022.

F3 · price: Not applicable.

F2 · derivative.exercise_date: Each restricted stock unit ('RSU') represents a contingent right to receive one share of Issuer common stock. This RSU grant vests in four annual installments, beginning September 1, 2022.

F2 · derivative.expiration_date: Each restricted stock unit ('RSU') represents a contingent right to receive one share of Issuer common stock. This RSU grant vests in four annual installments, beginning September 1, 2022.

SEC source: 0000874716-23-000121 · wk-form4_1694034061.xml · nonDerivative · entry 2

Smith Martin Alexander · CIK 0001621358 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 220.703

SEC source: 0000874716-23-000121 · wk-form4_1694034061.xml · nonDerivative · entry 1

Smith Martin Alexander · CIK 0001621358 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 225.703

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 26.7030 shares purchased under the Issuer's Employee Stock Purchase Plan on March 31, 2023 and June 30, 2023.

SEC source: 0000874716-23-000120 · wk-form4_1694034002.xml · derivative · entry 2

Britt Irene Chang · CIK 0001502314 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 493

Underlying: Common Stock · 493 shares

Expires 2033-08-31

F1 · security: This equity grant represents pro rata equity compensation earned by the reporting person as a non-employee Director from her election to the IDEXX Laboratories, Inc. Board of Directors on July 11, 2023 until the 2024 annual meeting of stockholders.

F3 · derivative.exercise_date: Grant of option to buy shares of IDEXX Laboratories, Inc. common stock that vests in one installment on May 17, 2024 or on the date of the 2024 annual meeting of stockholders, whichever event is earlier.

SEC source: 0000874716-23-000120 · wk-form4_1694034002.xml · derivative · entry 1

Britt Irene Chang · CIK 0001502314 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 208

Underlying: Common Stock · 208 shares

Expires not disclosed

F1 · security: This equity grant represents pro rata equity compensation earned by the reporting person as a non-employee Director from her election to the IDEXX Laboratories, Inc. Board of Directors on July 11, 2023 until the 2024 annual meeting of stockholders.

F2 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of IDEXX Laboratories, Inc. common stock. Restricted stock units vest in one installment on the date of the 2024 annual meeting of stockholders or May 17, 2024, whichever event occurs earlier.

F2 · derivative.exercise_date: Each restricted stock unit represents a contingent right to receive one share of IDEXX Laboratories, Inc. common stock. Restricted stock units vest in one installment on the date of the 2024 annual meeting of stockholders or May 17, 2024, whichever event occurs earlier.

F2 · derivative.expiration_date: Each restricted stock unit represents a contingent right to receive one share of IDEXX Laboratories, Inc. common stock. Restricted stock units vest in one installment on the date of the 2024 annual meeting of stockholders or May 17, 2024, whichever event occurs earlier.

SEC source: 0000874716-23-000117 · wk-form4_1693947669.xml · derivative · entry 3

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 13,424

Underlying: Common Stock · 13,424 shares

Expires 2025-02-13

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 13,424 shares of IDEXX Laboratories, Inc. common stock that became exercisable in five annual installments beginning on February 14, 2016 without giving effect to the 2-for-1 stock split of IDEXX Laboratories, Inc. common stock that occurred on June 15, 2015 (the "Stock Split"). The number of derivative securities reported as beneficially owned with respect to this option and its exercise price were adjusted to reflect the Stock Split.

SEC source: 0000874716-23-000117 · wk-form4_1693947669.xml · nonDerivative · entry 2

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 72,925.3456

F1 · price: Represents the weighted average price of the shares sold ranging from a low of $512.00 to a high of $512.49 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: 0000874716-23-000117 · wk-form4_1693947669.xml · nonDerivative · entry 1

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 86,349.3456

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: 0000874716-23-000116 · wk-form4_1693947610.xml · nonDerivative · entry 1

AYERS JONATHAN W · CIK 0001184149 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 134,297

SEC source: 0000874716-23-000113 · wk-form4_1693516123.xml · derivative · entry 16

POLEWACZYK JAMES F · CIK 0001389046 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 5,865 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.

F12 · derivative.exercise_date: Grant of option to buy 5,865 shares of Issuer common stock that vested in five annual installments beginning February 14, 2019.

SEC source: 0000874716-23-000113 · wk-form4_1693516123.xml · derivative · entry 15

POLEWACZYK JAMES F · CIK 0001389046 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 560 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.

F11 · derivative.exercise_date: Grant of option to buy 560 shares of Issuer common stock that vested in one installment on February 14, 2023.

SEC source: 0000874716-23-000113 · wk-form4_1693516123.xml · derivative · entry 14

POLEWACZYK JAMES F · CIK 0001389046 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 7,151 shares

Expires 2027-02-13

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.

F10 · derivative.exercise_date: Grant of option to buy 7,151 shares of Issuer common stock that vested in five annual installments beginning February 14, 2018.