Explanation of Responses:
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(1)
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Sales were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person.
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(2)
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Represents the weighted average sales price of the shares sold ranging from a low of $150.67 to a high of $151.67 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.
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(3)
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Represents the weighted average sales price of the shares sold ranging from a low of $151.68 to a high of $152.52 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.
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(4)
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Represents the weighted average sales price of the shares sold ranging from a low of $152.69 to a high of $153.50 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.
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(5)
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Represents the weighted average sales price of the shares sold ranging from a low of $153.70 to a high of $154.63 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 sold at each separate price.
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(6)
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Represents the weighted average sales price of the shares sold ranging from a low of $154.72 to a high of $155.11 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 sold at each separate price.
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(7)
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Represents the weighted average sales price of the shares sold ranging from a low of $149.50 to a high of $150.20 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.
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(8)
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Represents the weighted average sales price of the shares sold ranging from a low of $150.56 to a high of $151.4801 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.
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(9)
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Represents the weighted average sales price of the shares sold ranging from a low of $151.66 to a high of $152.66 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.
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(10)
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Represents the weighted average sales price of the shares sold ranging from a low of $152.67 to a high of $153.06 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 sold at each separate price.
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(11)
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Represents the weighted average sales price of the shares sold ranging from a low of $154.71 to a high of $154.81 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.
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(12)
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Represents the weighted average sales price of the shares sold ranging from a low of $147.08 to a high of $148.03 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.
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(13)
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Represents the weighted average sales price of the shares sold ranging from a low of $148.13 to a high of $148.71 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.
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(14)
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Represents the weighted average sales price of the shares sold ranging from a low of $150.00 to a high of $151.00 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.
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(15)
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Represents the weighted average sales price of the shares sold ranging from a low of $151.03 to a high of $151.05 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 sold at each separate price.
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(16)
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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.
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(17)
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Not applicable.
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