WAT

Represents common stock units received in lieu of cash payment of director fees pursuant to the Issuer's 1996 Non-Employee Director Deferred Compensation Plan. Common stock units are convertible into shares of the Issuer's common stock on a one-for-one basis upon distribution, which will occur automatically upon the Reporting Person's termination of service as a member of the Issuer's Board of Directors.

Represents common stock units received in lieu of cash payment of director fees pursuant to the Issuer's 1996 Non-Employee Director Deferred Compensation Plan. Common stock units are convertible into shares of the Issuer's common stock on a one-for-one basis upon distribution, which will occur on January 1, 2027, pursuant to an election previously made by the Reporting Person.

Represents shares of common stock withheld by the Issuer to satisfy tax withholding obligations in connection with the vesting and settlement of previously reported restricted stock units.

Represents shares of common stock withheld by the Issuer to satisfy tax withholding obligations in connection with the vesting and settlement of previously reported restricted stock units.

Includes 65.4519 shares of common stock acquired on March 31, 2026, pursuant to the Waters Corporation Amended and Restated 2009 Employee Stock Purchase Plan, in a transaction that was exempt pursuant to Rule 16b-3(c).

Represents shares of common stock withheld by the Issuer to satisfy tax withholding obligations in connection with the vesting and settlement of previously reported restricted stock units.

Represents common stock units received in lieu of cash payment of director fees pursuant to the Issuer's 1996 Non-Employee Director Deferred Compensation Plan. Common stock units are convertible into shares of the Issuer's common stock on a one-for-one basis upon distribution, which will occur on January 1, 2036, pursuant to an election previously made by the Reporting Person.

Represents common stock units received in lieu of cash payment of director fees pursuant to the Issuer's 1996 Non-Employee Director Deferred Compensation Plan. Common stock units are convertible into shares of the Issuer's common stock on a one-for-one basis upon distribution, which will occur on January 1, 2027, pursuant to an election previously made by the Reporting Person.

The price reported in Column 4 is a weighted average price. The shares were purchased in multiple transactions at prices ranging from $305.84 to $306.49 per share. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in this footnote.

Represents shares of common stock withheld by the Issuer to satisfy tax withholding obligations in connection with the vesting and settlement of previously reported performance stock units.

Represents shares of common stock withheld by the Issuer to satisfy tax withholding obligations in connection with the vesting and settlement of previously reported performance stock units.

Represents shares of common stock withheld by the Issuer to satisfy tax withholding obligations in connection with the vesting and settlement of previously reported performance stock units.

Represents shares of common stock subject to restrictions that lapse with respect to 100% of the shares on February 9, 2027.

Represents restricted stock units ("RSUs"), which will vest in four equal annual installments, with the first such installment vesting on February 25, 2027, subject to the Reporting Person's continued service with the Issuer on each such vesting date. The RSUs are convertible into shares of the Issuer's common stock on a one-to-one basis upon vesting and settlement.

The shares of common stock underlying this stock option will vest and become exercisable in four equal annual installments, with the first such installment vesting and becoming exercisable on February 25, 2027, subject to the Reporting Person's continued service with the Issuer on each such vesting date.

Represents restricted stock units ("RSUs"), which will vest in four equal annual installments, with the first such installment vesting on February 25, 2027, subject to the Reporting Person's continued service with the Issuer on each such vesting date. The RSUs are convertible into shares of the Issuer's common stock on a one-to-one basis upon vesting and settlement.

Represents shares of common stock subject to restrictions that lapse with respect to 100% of the shares on February 9, 2027.

All of the shares of common stock underlying this stock option will vest and become exercisable on February 9, 2027.

All of the shares of common stock underlying this stock option will vest and become exercisable on February 9, 2027.

Represents shares of common stock subject to restrictions that lapse with respect to 100% of the shares on February 9, 2027.

Represents shares of common stock subject to restrictions that lapse with respect to 100% of the shares on February 9, 2027.

All of the shares of common stock underlying this stock option will vest and become exercisable on February 9, 2027.

All of the shares of common stock underlying this stock option will vest and become exercisable on February 9, 2027.

The shares of common stock underlying this stock option will vest and become exercisable in four equal annual installments, with the first such installment vesting and becoming exercisable on February 25, 2027, subject to the Reporting Person's continued service with the Issuer on each such vesting date.

Represents shares of common stock subject to restrictions that lapse with respect to 100% of the shares on February 9, 2027.

Represents shares of common stock subject to restrictions that lapse with respect to 100% of the shares on February 9, 2027.

All of the shares of common stock underlying this stock option will vest and become exercisable on February 9, 2027.

All of the shares of common stock underlying this stock option will vest and become exercisable on February 9, 2027.

Represents shares of common stock subject to restrictions that lapse with respect to 100% of the shares on February 9, 2027.

All of the shares of common stock underlying this stock option will vest and become exercisable on February 9, 2027.

All of the shares of common stock underlying this stock option will vest and become exercisable on February 9, 2027.

Represents shares of common stock subject to restrictions that lapse with respect to 100% of the shares on February 9, 2027.

All of the shares of common stock underlying this stock option will vest and become exercisable on February 9, 2027.

All of the shares of common stock underlying this stock option will vest and become exercisable on February 9, 2027.

The shares of common stock underlying this stock option will vest and become exercisable in four equal annual installments, with the first such installment vesting and becoming exercisable on February 25, 2027, subject to the Reporting Person's continued service with the Issuer on each such vesting date.

Represents restricted stock units ("RSUs"), which will vest in four equal annual installments, with the first such installment vesting on February 25, 2027, subject to the Reporting Person's continued service with the Issuer on each such vesting date. The RSUs are convertible into shares of the Issuer's common stock on a one-to-one basis upon vesting and settlement.

Represents shares of common stock subject to restrictions that lapse with respect to 100% of the shares on February 9, 2027.

Represents shares of common stock subject to restrictions that lapse with respect to 100% of the shares on February 9, 2027.

Represents restricted stock units ("RSUs"), which will vest in four equal annual installments, with the first such installment vesting on February 25, 2027, subject to the Reporting Person's continued service with the Issuer on each such vesting date. The RSUs are convertible into shares of the Issuer's common stock on a one-to-one basis upon vesting and settlement.

The shares of common stock underlying this stock option will vest and become exercisable in four equal annual installments, with the first such installment vesting and becoming exercisable on February 25, 2027, subject to the Reporting Person's continued service with the Issuer on each such vesting date.

Represents shares of common stock withheld by the Issuer to satisfy tax withholding obligations in connection with the vesting and settlement of previously reported restricted stock units.

Represents shares of common stock withheld by the Issuer to satisfy tax withholding obligations in connection with the vesting and settlement of previously reported restricted stock units.

Represents shares of common stock withheld by the Issuer to satisfy tax withholding obligations in connection with the vesting and settlement of previously reported restricted stock units.

Represents shares of common stock withheld by the Issuer to satisfy tax withholding obligations in connection with the vesting and settlement of previously reported restricted stock units.

Represents performance-based restricted stock units ("PSUs") originally granted on February 8, 2023, subject to pre-determined service and performance-based vesting requirements. The level of achievement of the performance-based vesting requirement for the PSUs was certified by the Issuer's Compensation Committee on February 4, 2026, and the PSUs will vest in full upon satisfaction of the service-based vesting requirement on March 1, 2026. The PSUs are convertible into shares of the Issuer's Common Stock on a one-to-one basis upon vesting and settlement.

Represents performance-based restricted stock units ("PSUs") originally granted on February 8, 2023, subject to predetermined service and performance-based vesting requirements. The leve of achievement of the performance-based vesting requirements for the PSUs was satisfied upon the certification by the Issuer's Compensation Committee on February 4, 2026, and the PSUs will vest in full upon satisfaction of the service-based vesting requirement on March 1, 2026. The PSUs are convertible into shares of the Issuer's Common Stock on a one-to-one basis upon vesting and settlement.

Represents performance-based restricted stock units ("PSUs") originally granted on February 8, 2023, subject to pre-determined service and performance-based vesting requirements. The level of achievement of the performance-based vesting requirement for the PSUs was certified by the Issuer's Compensation Committee on February 4, 2026, and the PSUs will vest in full upon satisfaction of the service-based vesting requirement on March 1, 2026. The PSUs are convertible into shares of the Issuer's Common Stock on a one-to-one basis upon vesting and settlement.

Represents shares of common stock subject to restrictions that lapse with respect to 100% of the shares on January 2, 2027.

Represents shares of common stock subject to restrictions that lapse with respect to 100% of the shares on January 2, 2027.

Represents shares of common stock subject to restrictions that lapse with respect to 100% of the shares on January 2, 2027.