WAT

SEC source: 0001000697-26-000138 · form4.xml · nonDerivative · entry 1

Knight Heather · CIK 0001967528 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,337.95

F1 · shares: 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.

SEC source: 0001000697-26-000136 · form4.xml · nonDerivative · entry 1

Jiang Wei · CIK 0001867980 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,630.16

F1 · shares: 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.

SEC source: 0001000697-26-000127 · form4.xml · derivative · entry 3

KUEBLER CHRISTOPHER A · CIK 0001229877 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 3,626 shares

Expires 2027-01-03

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: 0001000697-26-000127 · form4.xml · nonDerivative · entry 2

KUEBLER CHRISTOPHER A · CIK 0001229877 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 17,808

SEC source: 0001000697-26-000127 · form4.xml · nonDerivative · entry 1

KUEBLER CHRISTOPHER A · CIK 0001229877 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 21,434

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: 0001000697-26-000119 · form4.xml · nonDerivative · entry 1

Knight Heather · CIK 0001967528 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,280.54

F1 · shares: 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.

SEC source: 0001000697-26-000117 · form4.xml · nonDerivative · entry 1

Jiang Wei · CIK 0001867980 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,572.75

F1 · shares: 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.

SEC source: 0001000697-26-000115 · form4.xml · nonDerivative · entry 1

Carpio Robert L III · CIK 0002027463 · SVP Waters Analytical Sciences

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,426

F1 · shares: 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.

SEC source: 0001000697-26-000113 · form4.xml · nonDerivative · entry 1

Chaubal Amol · CIK 0001773089 · SVP & Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 7,622.8449

F1 · shares: 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.

F2 · balance_after: 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).

SEC source: 0001000697-26-000111 · form4.xml · nonDerivative · entry 1

Bennett Jianqing · CIK 0001856691 · SVP Waters Adv. Diagnostics

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 6,532

F1 · shares: 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.

SEC source: 0001000697-26-000109 · form4.xml · nonDerivative · entry 1

Jiang Wei · CIK 0001867980 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,505.33

F1 · shares: 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.

SEC source: 0001000697-26-000107 · form4.xml · nonDerivative · entry 1

Knight Heather · CIK 0001967528 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,217.51

F1 · shares: 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.

SEC source: 0001000697-26-000105 · form4.xml · nonDerivative · entry 1

Jiang Wei · CIK 0001867980 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,441.27

SEC source: 0001000697-26-000103 · form4.xml · nonDerivative · entry 1

FEARON RICHARD H · CIK 0001188586 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,302

F1 · price: 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.

SEC source: 0001000697-26-000101 · form4.xml · nonDerivative · entry 1

Batra Udit · CIK 0001821498 · Director · President and CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 33,140

F1 · shares: 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.

SEC source: 0001000697-26-000099 · form4.xml · nonDerivative · entry 1

Chaubal Amol · CIK 0001773089 · SVP & Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 7,796.393

F1 · shares: 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.

SEC source: 0001000697-26-000097 · form4.xml · nonDerivative · entry 1

Bennett Jianqing · CIK 0001856691 · SVP Waters Adv. Diagnostics

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 6,834

F1 · shares: 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.

SEC source: 0001000697-26-000095 · form4.xml · derivative · entry 2

Carpio Robert L III · CIK 0002027463 · SVP Waters Analytical Sciences

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,884

Underlying: Common Stock · 4,884 shares

Expires 2036-02-25

F2 · derivative.exercise_date: 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.

SEC source: 0001000697-26-000095 · form4.xml · nonDerivative · entry 1

Carpio Robert L III · CIK 0002027463 · SVP Waters Analytical Sciences

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,615

F1 · shares: 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.

SEC source: 0001000697-26-000093 · form4.xml · derivative · entry 2

Bennett Jianqing · CIK 0001856691 · SVP Waters Adv. Diagnostics

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,826

Underlying: Common Stock · 4,826 shares

Expires 2036-02-25

F2 · derivative.exercise_date: 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.

SEC source: 0001000697-26-000093 · form4.xml · nonDerivative · entry 1

Bennett Jianqing · CIK 0001856691 · SVP Waters Adv. Diagnostics

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 7,244

F1 · shares: 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.

SEC source: 0001000697-26-000091 · form4.xml · derivative · entry 2

Chaubal Amol · CIK 0001773089 · SVP & Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 7,125

Underlying: Common Stock · 7,125 shares

Expires 2036-02-25

F2 · derivative.exercise_date: 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.

SEC source: 0001000697-26-000091 · form4.xml · nonDerivative · entry 1

Chaubal Amol · CIK 0001773089 · SVP & Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 8,505.393

F1 · shares: 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.

SEC source: 0001000697-26-000089 · form4.xml · derivative · entry 2

Batra Udit · CIK 0001821498 · Director · President and CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 25,283

Underlying: Common Stock · 25,283 shares

Expires 2036-02-25

F2 · derivative.exercise_date: 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.

SEC source: 0001000697-26-000089 · form4.xml · nonDerivative · entry 1

Batra Udit · CIK 0001821498 · Director · President and CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 36,557

F1 · shares: 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.

SEC source: 0001000697-26-000085 · form4.xml · derivative · entry 2

KUEBLER CHRISTOPHER A · CIK 0001229877 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 57

Underlying: Common Stock · 57 shares

Expires 2036-02-25

F2 · shares: All of the shares of common stock underlying this stock option will vest and become exercisable on February 9, 2027.

SEC source: 0001000697-26-000085 · form4.xml · nonDerivative · entry 1

KUEBLER CHRISTOPHER A · CIK 0001229877 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 17,808

F1 · shares: Represents shares of common stock subject to restrictions that lapse with respect to 100% of the shares on February 9, 2027.

SEC source: 0001000697-26-000087 · form4.xml · derivative · entry 2

Vergnano Mark · CIK 0001474107 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 57

Underlying: Common Stock · 57 shares

Expires 2036-02-25

F2 · shares: All of the shares of common stock underlying this stock option will vest and become exercisable on February 9, 2027.

SEC source: 0001000697-26-000087 · form4.xml · nonDerivative · entry 1

Vergnano Mark · CIK 0001474107 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,540

F1 · shares: Represents shares of common stock subject to restrictions that lapse with respect to 100% of the shares on February 9, 2027.

SEC source: 0001000697-26-000083 · form4.xml · derivative · entry 2

Knight Heather · CIK 0001967528 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 57

Underlying: Common Stock · 57 shares

Expires 2036-02-25

F2 · shares: All of the shares of common stock underlying this stock option will vest and become exercisable on February 9, 2027.

SEC source: 0001000697-26-000083 · form4.xml · nonDerivative · entry 1

Knight Heather · CIK 0001967528 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,149.07

F1 · shares: Represents shares of common stock subject to restrictions that lapse with respect to 100% of the shares on February 9, 2027.

SEC source: 0001000697-26-000081 · form4.xml · derivative · entry 2

Jiang Wei · CIK 0001867980 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 57

Underlying: Common Stock · 57 shares

Expires 2036-02-25

F2 · shares: All of the shares of common stock underlying this stock option will vest and become exercisable on February 9, 2027.

SEC source: 0001000697-26-000081 · form4.xml · nonDerivative · entry 1

Jiang Wei · CIK 0001867980 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,941.27

F1 · shares: Represents shares of common stock subject to restrictions that lapse with respect to 100% of the shares on February 9, 2027.

SEC source: 0001000697-26-000079 · form4.xml · derivative · entry 2

Huang Pearl S · CIK 0001837486 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 57

Underlying: Common Stock · 57 shares

Expires 2036-02-25

F2 · shares: All of the shares of common stock underlying this stock option will vest and become exercisable on February 9, 2027.

SEC source: 0001000697-26-000079 · form4.xml · nonDerivative · entry 1

Huang Pearl S · CIK 0001837486 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,276.3

F1 · shares: Represents shares of common stock subject to restrictions that lapse with respect to 100% of the shares on February 9, 2027.

SEC source: 0001000697-26-000077 · form4.xml · derivative · entry 2

Fraser Claire · CIK 0001382031 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 877

Underlying: Common Stock · 877 shares

Expires 2036-02-25

F2 · shares: All of the shares of common stock underlying this stock option will vest and become exercisable on February 9, 2027.

SEC source: 0001000697-26-000077 · form4.xml · nonDerivative · entry 1

Fraser Claire · CIK 0001382031 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 489

F1 · shares: Represents shares of common stock subject to restrictions that lapse with respect to 100% of the shares on February 9, 2027.

SEC source: 0001000697-26-000075 · form4.xml · derivative · entry 2

FEARON RICHARD H · CIK 0001188586 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 57

Underlying: Common Stock · 57 shares

Expires 2036-02-25

F2 · shares: All of the shares of common stock underlying this stock option will vest and become exercisable on February 9, 2027.

SEC source: 0001000697-26-000075 · form4.xml · nonDerivative · entry 1

FEARON RICHARD H · CIK 0001188586 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,302

F1 · shares: Represents shares of common stock subject to restrictions that lapse with respect to 100% of the shares on February 9, 2027.

SEC source: 0001000697-26-000073 · form4.xml · derivative · entry 2

Brennan Daniel J. · CIK 0001595612 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 57

Underlying: Common Stock · 57 shares

Expires 2036-02-25

F2 · shares: All of the shares of common stock underlying this stock option will vest and become exercisable on February 9, 2027.

SEC source: 0001000697-26-000073 · form4.xml · nonDerivative · entry 1

Brennan Daniel J. · CIK 0001595612 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,355

F1 · shares: Represents shares of common stock subject to restrictions that lapse with respect to 100% of the shares on February 9, 2027.

SEC source: 0001000697-26-000071 · form4.xml · derivative · entry 2

BADDOUR LINDA · CIK 0001181151 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 57

Underlying: Common Stock · 57 shares

Expires 2036-02-25

F2 · shares: All of the shares of common stock underlying this stock option will vest and become exercisable on February 9, 2027.

SEC source: 0001000697-26-000071 · form4.xml · nonDerivative · entry 1

BADDOUR LINDA · CIK 0001181151 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,899

F1 · shares: Represents shares of common stock subject to restrictions that lapse with respect to 100% of the shares on February 9, 2027.

SEC source: 0001000697-26-000069 · form4.xml · derivative · entry 2

Ornskov Flemming · CIK 0001709473 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 57

Underlying: Common Stock · 57 shares

Expires 2036-02-25

F2 · shares: All of the shares of common stock underlying this stock option will vest and become exercisable on February 9, 2027.

SEC source: 0001000697-26-000069 · form4.xml · nonDerivative · entry 1

Ornskov Flemming · CIK 0001709473 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,271

F1 · shares: Represents shares of common stock subject to restrictions that lapse with respect to 100% of the shares on February 9, 2027.

SEC source: 0001000697-26-000048 · form4.xml · nonDerivative · entry 1

Carpio Robert L III · CIK 0002027463 · SVP, Waters Division

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,618

F1 · shares: 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.

SEC source: 0001000697-26-000046 · form4.xml · nonDerivative · entry 2

Bennett Jianqing · CIK 0001856691 · SVP TA Instruments Division

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 6,258

F2 · shares: 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.

SEC source: 0001000697-26-000044 · form4.xml · nonDerivative · entry 2

Chaubal Amol · CIK 0001773089 · SVP & Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 7,050.393

F2 · shares: 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.

SEC source: 0001000697-26-000042 · form4.xml · nonDerivative · entry 2

Batra Udit · CIK 0001821498 · Director · President and CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 31,392

F2 · shares: 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.

SEC source: 0001000697-26-000046 · form4.xml · nonDerivative · entry 1

Bennett Jianqing · CIK 0001856691 · SVP TA Instruments Division

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 6,301

F1 · shares: 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.