IDXX

SEC source: 0001140361-17-032509 · doc1.xml · nonDerivative · entry 7

AYERS JONATHAN W · CIK 0001184149 · Director · Chairman, President & CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,027,034

F3 · price: Represents the weighted average sales price of the shares sold ranging from a low of $154.25 to a high of $154.40 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 sold at each separate price.

SEC source: 0001140361-17-032509 · doc1.xml · nonDerivative · entry 6

AYERS JONATHAN W · CIK 0001184149 · Director · Chairman, President & CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,032,134

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: 0001140361-17-032509 · doc1.xml · nonDerivative · entry 5

AYERS JONATHAN W · CIK 0001184149 · Director · Chairman, President & CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,027,034

F2 · price: Represents the weighted average sales price of the shares sold ranging from a low of $154.50 to a high of $154.95 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 sold at each separate price.

SEC source: 0001140361-17-032509 · doc1.xml · nonDerivative · entry 4

AYERS JONATHAN W · CIK 0001184149 · Director · Chairman, President & CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,041,934

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: 0001140361-17-032509 · doc1.xml · derivative · entry 14

AYERS JONATHAN W · CIK 0001184149 · Director · Chairman, President & CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 305,000

Underlying: Common Stock · 2,000 shares

Expires 2018-02-13

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 · price: Not applicable.

F5 · derivative.exercise_date: Grant of option to buy 200,000 shares of IDEXX Laboratories, Inc. common stock that became exercisable in five equal annual installments beginning on February 14, 2012 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: 0001140361-17-032509 · doc1.xml · derivative · entry 13

AYERS JONATHAN W · CIK 0001184149 · Director · Chairman, President & CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 307,000

Underlying: Common Stock · 18,000 shares

Expires 2018-02-13

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 · price: Not applicable.

F5 · derivative.exercise_date: Grant of option to buy 200,000 shares of IDEXX Laboratories, Inc. common stock that became exercisable in five equal annual installments beginning on February 14, 2012 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: 0001140361-17-032509 · doc1.xml · nonDerivative · entry 3

AYERS JONATHAN W · CIK 0001184149 · Director · Chairman, President & CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,027,034

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: 0001140361-17-032509 · doc1.xml · nonDerivative · entry 2

AYERS JONATHAN W · CIK 0001184149 · Director · Chairman, President & CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,025,034

F1 · price: Represents the weighted average sales price of the shares sold ranging from a low of $154.80 to a high of $155.00 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 sold at each separate price.

SEC source: 0001140361-17-032509 · doc1.xml · nonDerivative · entry 1

AYERS JONATHAN W · CIK 0001184149 · Director · Chairman, President & CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,043,034

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: 0001140361-17-031210 · doc1.xml · derivative · entry 6

AYERS JONATHAN W · CIK 0001184149 · Director · Chairman, President & CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 325,000

Underlying: Common Stock · 3,000 shares

Expires 2018-02-13

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 200,000 shares of IDEXX Laboratories, Inc. common stock that became exercisable in five equal annual installments beginning on February 14, 2012 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: 0001140361-17-031210 · doc1.xml · derivative · entry 5

AYERS JONATHAN W · CIK 0001184149 · Director · Chairman, President & CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 328,000

Underlying: Common Stock · 17,000 shares

Expires 2018-02-13

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 200,000 shares of IDEXX Laboratories, Inc. common stock that became exercisable in five equal annual installments beginning on February 14, 2012 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: 0001140361-17-031210 · doc1.xml · nonDerivative · entry 3

AYERS JONATHAN W · CIK 0001184149 · Director · Chairman, President & CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,025,034

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: 0001140361-17-031210 · doc1.xml · nonDerivative · entry 2

AYERS JONATHAN W · CIK 0001184149 · Director · Chairman, President & CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,022,034

F1 · price: Represents the weighted average sales price of the shares sold ranging from a low of $154.18 to a high of $154.94 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 sold at each separate price.

SEC source: 0001140361-17-031210 · doc1.xml · nonDerivative · entry 1

AYERS JONATHAN W · CIK 0001184149 · Director · Chairman, President & CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,039,034

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: 0001140361-17-030931 · doc1.xml · derivative · entry 7

AYERS JONATHAN W · CIK 0001184149 · Director · Chairman, President & CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 345,000

Underlying: Common Stock · 2,000 shares

Expires 2018-02-13

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 200,000 shares of IDEXX Laboratories, Inc. common stock that became exercisable in five equal annual installments beginning on February 14, 2012 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: 0001140361-17-030931 · doc1.xml · derivative · entry 6

AYERS JONATHAN W · CIK 0001184149 · Director · Chairman, President & CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 347,000

Underlying: Common Stock · 18,000 shares

Expires 2018-02-13

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 200,000 shares of IDEXX Laboratories, Inc. common stock that became exercisable in five equal annual installments beginning on February 14, 2012 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: 0001140361-17-030931 · doc1.xml · nonDerivative · entry 4

AYERS JONATHAN W · CIK 0001184149 · Director · Chairman, President & CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,022,034

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: 0001140361-17-030931 · doc1.xml · nonDerivative · entry 3

AYERS JONATHAN W · CIK 0001184149 · Director · Chairman, President & CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,020,034

F3 · price: Represents the weighted average sales price of the shares sold ranging from a low of $155.56 to a high of $156.14 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 sold at each separate price.

SEC source: 0001140361-17-030931 · doc1.xml · nonDerivative · entry 2

AYERS JONATHAN W · CIK 0001184149 · Director · Chairman, President & CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,026,534

F2 · price: Represents the weighted average sales price of the shares sold ranging from a low of $154.55 to a high of $155.54 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 sold at each separate price.

SEC source: 0001140361-17-030931 · doc1.xml · nonDerivative · entry 1

AYERS JONATHAN W · CIK 0001184149 · Director · Chairman, President & CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,038,034

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 40 shares acquired under the IDEXX Laboratories, Inc. Employee Stock Purchase Plan on June 30, 2017.

SEC source: 0001140361-17-030282 · doc1.xml · nonDerivative · entry 1

Kingsley Lawrence D · CIK 0001301427 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,344

F1 · price: Represents the weighted average sales price of the shares sold ranging from a low of $151.73 to a high of $151.76 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 sold at each separate price.

SEC source: 0001140361-17-029428 · doc1.xml · nonDerivative · entry 1

Kingsley Lawrence D · CIK 0001301427 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,344

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 ($18,750.00) 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 one year 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: 0001140361-17-029427 · doc1.xml · nonDerivative · entry 1

JUNIUS DANIEL M · CIK 0001094159 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 2,560

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 ($5,937.50) 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 one year 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: 0001140361-17-023352 · doc1.xml · nonDerivative · entry 1

TWIGGE GIOVANI · CIK 0001500399 · Chief Human Resources Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 16,332

F1 · balance_after: Includes 47 shares acquired under the IDEXX Laboratories, Inc. Employee Stock Purchase Plan on March 31, 2017.

SEC source: 0001140361-17-023350 · doc1.xml · derivative · entry 4

AYERS JONATHAN W · CIK 0001184149 · Director · Chairman, President & CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 365,000

Underlying: Common Stock · 15,000 shares

Expires 2018-02-13

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 200,000 shares of IDEXX Laboratories, Inc. common stock that became exercisable in five equal annual installments beginning on February 14, 2012 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: 0001140361-17-023350 · doc1.xml · nonDerivative · entry 2

AYERS JONATHAN W · CIK 0001184149 · Director · Chairman, President & CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,019,994

F1 · price: Represents the weighted average sales price of the shares sold ranging from a low of $167.34 to a high of $168.10 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 sold at each separate price.

SEC source: 0001140361-17-023350 · doc1.xml · nonDerivative · entry 1

AYERS JONATHAN W · CIK 0001184149 · Director · Chairman, President & CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,032,994

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: 0001140361-17-021820 · doc1.xml · nonDerivative · entry 1

END WILLIAM T · CIK 0001184157 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 45,256

F1 · price: Represents the weighted average sales price of the shares sold ranging from a low of $162.2491 to a high of $162.9229 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 sold at each separate price.

SEC source: 0001140361-17-019820 · doc1.xml · derivative · entry 8

AYERS JONATHAN W · CIK 0001184149 · Director · Chairman, President & CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 380,000

Underlying: Common Stock · 20,000 shares

Expires 2018-02-13

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 · price: Not applicable.

F5 · derivative.exercise_date: Grant of option to buy 200,000 shares of IDEXX Laboratories, Inc. common stock that became exercisable in five equal annual installments beginning on February 14, 2012 without giving effect to 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: 0001140361-17-019820 · doc1.xml · derivative · entry 7

AYERS JONATHAN W · CIK 0001184149 · Director · Chairman, President & CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 10,000 shares

Expires 2018-02-13

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 · price: Not applicable.

F4 · derivative.exercise_date: Grant of option to buy 58,712 shares of IDEXX Laboratories, Inc. common stock that became exercisable in four annual installments of 12,000 shares each beginning on February 14, 2012 and as to the remaining 10,712 shares 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: 0001140361-17-019820 · doc1.xml · nonDerivative · entry 5

AYERS JONATHAN W · CIK 0001184149 · Director · Chairman, President & CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,014,994

F3 · price: Represents the weighted average sales price of the shares sold ranging from a low of $163.04 to a high of $163.60 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 sold at each separate price.

SEC source: 0001140361-17-019820 · doc1.xml · nonDerivative · entry 4

AYERS JONATHAN W · CIK 0001184149 · Director · Chairman, President & CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,028,794

F2 · price: Represents the weighted average sales price of the shares sold ranging from a low of $161.95 to a high of $162.90 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 sold at each separate price.

SEC source: 0001140361-17-019820 · doc1.xml · nonDerivative · entry 3

AYERS JONATHAN W · CIK 0001184149 · Director · Chairman, President & CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,034,994

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: 0001140361-17-019820 · doc1.xml · nonDerivative · entry 2

AYERS JONATHAN W · CIK 0001184149 · Director · Chairman, President & CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,014,994

F1 · price: Represents the weighted average sales price of the shares sold ranging from a low of $161.55 to a high of $162.50 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 sold at each separate price.

SEC source: 0001140361-17-019820 · doc1.xml · nonDerivative · entry 1

AYERS JONATHAN W · CIK 0001184149 · Director · Chairman, President & CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,024,994

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: 0001140361-17-023349 · doc1.xml · derivative · entry 8

AYERS JONATHAN W · CIK 0001184149 · Director · Chairman, President & CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 380,000

Underlying: Common Stock · 20,000 shares

Expires 2018-02-13

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 · price: Not applicable.

F5 · derivative.exercise_date: Grant of option to buy 200,000 shares of IDEXX Laboratories, Inc. common stock that became exercisable in five equal annual installments beginning on February 14, 2012 without giving effect to 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: 0001140361-17-023349 · doc1.xml · derivative · entry 7

AYERS JONATHAN W · CIK 0001184149 · Director · Chairman, President & CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 10,000 shares

Expires 2018-02-13

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 · price: Not applicable.

F4 · derivative.exercise_date: Grant of option to buy 58,712 shares of IDEXX Laboratories, Inc. common stock that became exercisable in four annual installments of 12,000 shares each beginning on February 14, 2012 and as to the remaining 10,712 shares 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: 0001140361-17-023349 · doc1.xml · nonDerivative · entry 5

AYERS JONATHAN W · CIK 0001184149 · Director · Chairman, President & CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,017,994

F3 · price: Represents the weighted average sales price of the shares sold ranging from a low of $163.04 to a high of $163.60 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 sold at each separate price.

F7 · balance_after: Amendment filed due to scrivener's error in the calculation of the number of shares held at the completion of the transactions.

SEC source: 0001140361-17-023349 · doc1.xml · nonDerivative · entry 4

AYERS JONATHAN W · CIK 0001184149 · Director · Chairman, President & CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,028,794

F2 · price: Represents the weighted average sales price of the shares sold ranging from a low of $161.95 to a high of $162.90 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 sold at each separate price.

SEC source: 0001140361-17-023349 · doc1.xml · nonDerivative · entry 3

AYERS JONATHAN W · CIK 0001184149 · Director · Chairman, President & CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,034,994

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: 0001140361-17-023349 · doc1.xml · nonDerivative · entry 2

AYERS JONATHAN W · CIK 0001184149 · Director · Chairman, President & CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,014,994

F1 · price: Represents the weighted average sales price of the shares sold ranging from a low of $161.55 to a high of $162.50 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 sold at each separate price.

SEC source: 0001140361-17-023349 · doc1.xml · nonDerivative · entry 1

AYERS JONATHAN W · CIK 0001184149 · Director · Chairman, President & CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,024,994

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: 0001140361-17-018919 · doc1.xml · derivative · entry 4

AYERS JONATHAN W · CIK 0001184149 · Director · Chairman, President & CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 10,000

Underlying: Common Stock · 30,000 shares

Expires 2018-02-13

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 · price: Not applicable.

F3 · derivative.exercise_date: Grant of option to buy 58,712 shares of IDEXX Laboratories, Inc. common stock that became exercisable in four annual installments of 12,000 shares each beginning on February 14, 2012 and as to the remaining 10,712 shares 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: 0001140361-17-018919 · doc1.xml · nonDerivative · entry 2

AYERS JONATHAN W · CIK 0001184149 · Director · Chairman, President & CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,014,994

F2 · price: Represents the weighted average sales price of the shares sold ranging from a low of $160.40 to a high of $160.73 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 sold at each separate price.

SEC source: 0001140361-17-018919 · doc1.xml · nonDerivative · entry 1

AYERS JONATHAN W · CIK 0001184149 · Director · Chairman, President & CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,040,994

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 47 shares acquired under the IDEXX Laboratories, Inc. Employee Stock Purchase Plan on March 31, 2017.

SEC source: 0001140361-17-018657 · doc1.xml · derivative · entry 5

HENDERSON REBECCA M · CIK 0001254748 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 6,602 shares

Expires 2018-02-13

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 shares of IDEXX Laboratories, Inc. common stock that became exercisable as to 3,301 shares on February 14, 2012, 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: 0001140361-17-018657 · doc1.xml · nonDerivative · entry 2

HENDERSON REBECCA M · CIK 0001254748 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 19,852

F1 · price: Represents the weighted average sales price of the shares sold ranging from a low of $159.9110 to a high of $159.9718 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 sold at each separate price.

SEC source: 0001140361-17-018657 · doc1.xml · nonDerivative · entry 1

HENDERSON REBECCA M · CIK 0001254748 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 21,552

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: 0001140361-17-018660 · doc1.xml · derivative · entry 2

SZOSTAK M ANNE · CIK 0001094176 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,046

Underlying: Common Stock · 3,046 shares

Expires 2027-05-02

F3 · price: Not applicable.

F2 · derivative.exercise_date: Grant of option to buy shares of IDEXX Laboratories, Inc. common stock that vest in one installment on May 3, 2018.

SEC source: 0001140361-17-018660 · doc1.xml · derivative · entry 1

SZOSTAK M ANNE · CIK 0001094176 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,494

Underlying: Common Stock · 289 shares

Expires not disclosed

F1 · derivative.exercise_price: Each deferred stock unit represents a contingent right to receive one share of IDEXX Laboratories, Inc. common stock. Deferred stock units vest in one installment on the one year anniversary of the date of grant or on the date of the 2018 annual meeting of stockholders, whichever event is earlier, and are payable as common stock one year following the Director's resignation from the Board of Directors.

F3 · price: Not applicable.

F1 · derivative.exercise_date: Each deferred stock unit represents a contingent right to receive one share of IDEXX Laboratories, Inc. common stock. Deferred stock units vest in one installment on the one year anniversary of the date of grant or on the date of the 2018 annual meeting of stockholders, whichever event is earlier, and are payable as common stock one year following the Director's resignation from the Board of Directors.

F1 · derivative.expiration_date: Each deferred stock unit represents a contingent right to receive one share of IDEXX Laboratories, Inc. common stock. Deferred stock units vest in one installment on the one year anniversary of the date of grant or on the date of the 2018 annual meeting of stockholders, whichever event is earlier, and are payable as common stock one year following the Director's resignation from the Board of Directors.