Explanation of Responses:
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(1)
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Includes 22 shares of common stock acquired under the IDEXX Laboratories, Inc. Employee Stock Purchase Plan on September 30, 2019.
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(2)
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Represents the weighted average price of the shares sold ranging from a low of $278.155 to a high of $279.15 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.
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(3)
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Represents the weighted average price of the shares sold ranging from a low of $279.16 to a high of $280.15 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.
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(4)
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Represents the weighted average price of the shares sold ranging from a low of $280.17 to a high of $280.63 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.
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(5)
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Represents the weighted average price of the shares sold ranging from a low of $279.01 to a high of $280.01 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.
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(6)
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Represents the weighted average price of the shares sold ranging from a low of $280.05 to a high of $280.32 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.
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(7)
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Represents the weighted average price of the shares sold ranging from a low of 281.515 to a high of $281.90 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 purchased at each separate price.
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(8)
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Represents the weighted average price of the shares sold ranging from a low of 277.55 to a high of $277.95 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 purchased at each separate price.
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(9)
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Represents the weighted average price of the shares sold ranging from a low of 265.00 to a high of $266.00 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 purchased at each separate price.
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(10)
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Represents the weighted average price of the shares sold ranging from a low of 266.1150 to a high of $267.05 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.
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(11)
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The number of derivative securities has been revised to reflect the current number available for the reported transaction.
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(12)
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Grant of option to buy 55,910 shares of IDEXX Laboratories, Inc. common stock that became exercisable in five equal annual installments beginning on February 14, 2014 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.
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(13)
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Not applicable.
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