MKSI

SEC source: 0001127602-23-028820 · form4.xml · derivative · entry 11

Lee John Tseng-Chung · CIK 0001414656 · Director · President & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 77,525.118

Underlying: Common Stock · 970 shares

Expires not disclosed

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 · derivative.exercise_price: Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Instruments, Inc.

F1 · price: Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Instruments, Inc.

F5 · derivative.exercise_date: Portion of 2023 RSU Award accelerated to satisfy FICA taxes.

F5 · derivative.expiration_date: Portion of 2023 RSU Award accelerated to satisfy FICA taxes.

SEC source: 0001127602-23-028820 · form4.xml · derivative · entry 10

Lee John Tseng-Chung · CIK 0001414656 · Director · President & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 78,495.118

Underlying: Common Stock · 569 shares

Expires not disclosed

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 · derivative.exercise_price: Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Instruments, Inc.

F1 · price: Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Instruments, Inc.

F4 · derivative.exercise_date: Portion of 2022 RSU Award accelerated to satisfy FICA taxes.

F4 · derivative.expiration_date: Portion of 2022 RSU Award accelerated to satisfy FICA taxes.

SEC source: 0001127602-23-028820 · form4.xml · derivative · entry 9

Lee John Tseng-Chung · CIK 0001414656 · Director · President & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 79,064.118

Underlying: Common Stock · 160 shares

Expires not disclosed

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 · derivative.exercise_price: Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Instruments, Inc.

F1 · price: Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Instruments, Inc.

F3 · derivative.exercise_date: Portion of 2021 RSU Award accelerated to satisfy FICA taxes.

F3 · derivative.expiration_date: Portion of 2021 RSU Award accelerated to satisfy FICA taxes.

SEC source: 0001127602-23-028820 · form4.xml · derivative · entry 8

Lee John Tseng-Chung · CIK 0001414656 · Director · President & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 79,224.118

Underlying: Common Stock · 1,186 shares

Expires not disclosed

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 · derivative.exercise_price: Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Instruments, Inc.

F1 · price: Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Instruments, Inc.

F4 · derivative.exercise_date: Portion of 2022 RSU Award accelerated to satisfy FICA taxes.

F4 · derivative.expiration_date: Portion of 2022 RSU Award accelerated to satisfy FICA taxes.

SEC source: 0001127602-23-028820 · form4.xml · derivative · entry 7

Lee John Tseng-Chung · CIK 0001414656 · Director · President & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 80,410.118

Underlying: Common Stock · 390 shares

Expires not disclosed

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 · derivative.exercise_price: Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Instruments, Inc.

F1 · price: Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Instruments, Inc.

F3 · derivative.exercise_date: Portion of 2021 RSU Award accelerated to satisfy FICA taxes.

F3 · derivative.expiration_date: Portion of 2021 RSU Award accelerated to satisfy FICA taxes.

SEC source: 0001127602-23-028820 · form4.xml · nonDerivative · entry 6

Lee John Tseng-Chung · CIK 0001414656 · Director · President & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 78,138.607

F2 · kind: Shares used to satisfy FICA taxes.

SEC source: 0001127602-23-028820 · form4.xml · nonDerivative · entry 5

Lee John Tseng-Chung · CIK 0001414656 · Director · President & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 81,413.607

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 · price: Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Instruments, Inc.

SEC source: 0001127602-23-028820 · form4.xml · nonDerivative · entry 4

Lee John Tseng-Chung · CIK 0001414656 · Director · President & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 80,443.607

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 · price: Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Instruments, Inc.

SEC source: 0001127602-23-028820 · form4.xml · nonDerivative · entry 3

Lee John Tseng-Chung · CIK 0001414656 · Director · President & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 79,874.607

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 · price: Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Instruments, Inc.

SEC source: 0001127602-23-028820 · form4.xml · nonDerivative · entry 2

Lee John Tseng-Chung · CIK 0001414656 · Director · President & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 79,714.607

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 · price: Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Instruments, Inc.

SEC source: 0001127602-23-028820 · form4.xml · nonDerivative · entry 1

Lee John Tseng-Chung · CIK 0001414656 · Director · President & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 78,528.607

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 · price: Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Instruments, Inc.

SEC source: 0001127602-23-026990 · form4.xml · nonDerivative · entry 1

Henry David Philip · CIK 0001842459 · EVP, Operations & Corp Mktg

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 11,073.35

SEC source: 0001127602-23-025067 · form4.xml · nonDerivative · entry 1

Mora Elizabeth · CIK 0001548935 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 17,362.258

F1 · kind: This transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 17, 2023.

SEC source: 0001127602-23-023836 · form4.xml · nonDerivative · entry 2

BAGSHAW SETH H · CIK 0001192439 · EVP, CFO & Treasurer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 20,546.596

F2 · price: This transaction was executed in multiple trades at prices ranging from $97.50 to $97.95. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide, upon request, the full information regarding the number of shares and prices at which the transaction was effected.

SEC source: 0001127602-23-023836 · form4.xml · nonDerivative · entry 1

BAGSHAW SETH H · CIK 0001192439 · EVP, CFO & Treasurer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 27,619.596

F1 · price: This transaction was executed in multiple trades at prices ranging from $96.50 to $97.49. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide, upon request, the full information regarding the number of shares and prices at which the transaction was effected.

SEC source: 0001127602-23-023506 · form4.xml · nonDerivative · entry 1

COLELLA GERARD G · CIK 0001256715 · Director

10b5-1 filing: Plan reported

Ownership: Indirect · By The Gerald G. Colella Living Trust

Disclosed balance after: 88,017

F1 · kind: This transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 8, 2023.

F2 · price: This transaction was executed in multiple trades at prices ranging from $100.00 to $100.11. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide, upon request, the full information regarding the number of shares and prices at which the transaction was effected.

SEC source: 0001127602-23-023322 · form4.xml · nonDerivative · entry 1

Moloney Jacqueline F · CIK 0001501968 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 11,578.434

SEC source: 0001127602-23-022181 · form4.xml · nonDerivative · entry 2

Burke Kathleen Flaherty · CIK 0001775435 · EVP, GC & Secretary

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 42,737.608

F2 · price: This transaction was executed in multiple trades at prices ranging from $101.350 to $101.485. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide, upon request, the full information regarding the number of shares and prices at which the transaction was effected.

SEC source: 0001127602-23-022181 · form4.xml · nonDerivative · entry 1

Burke Kathleen Flaherty · CIK 0001775435 · EVP, GC & Secretary

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 48,114.675

F1 · price: This transaction was executed in multiple trades at prices ranging from $101.080 to $101.260. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide, upon request, the full information regarding the number of shares and prices at which the transaction was effected.

SEC source: 0001127602-23-019838 · form4.xml · nonDerivative · entry 1

Mora Elizabeth · CIK 0001548935 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 17,612.258

F1 · kind: This transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 17, 2023.

SEC source: 0001127602-23-017454 · form4.xml · nonDerivative · entry 1

Mora Elizabeth · CIK 0001548935 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 17,862.258

F1 · kind: This transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 1, 2022.

SEC source: 0001127602-23-017452 · form4.xml · nonDerivative · entry 1

Moloney Jacqueline F · CIK 0001501968 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 11,828.434

F1 · kind: This transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 25, 2022.

SEC source: 0001127602-23-015875 · form4.xml · nonDerivative · entry 1

Warner Michelle M · CIK 0001661884 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 9,230.038

F1 · kind: These restricted stock units become fully vested on the day prior to the first annual meeting of shareholders following the date of grant (or if no such meeting is held within 13 months after the date of grant, on the 13 month anniversary of the date of grant).

F2 · price: Each restricted stock unit represents the contingent right to receive one share of common stock of MKS Instruments, Inc.

SEC source: 0001127602-23-015873 · form4.xml · nonDerivative · entry 1

Mora Elizabeth · CIK 0001548935 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 18,062.258

F1 · kind: These restricted stock units become fully vested on the day prior to the first annual meeting of shareholders following the date of grant (or if no such meeting is held within 13 months after the date of grant, on the 13 month anniversary of the date of grant).

F2 · price: Each restricted stock unit represents the contingent right to receive one share of common stock of MKS Instruments, Inc.

SEC source: 0001127602-23-015865 · form4.xml · nonDerivative · entry 1

Donahue Joseph B · CIK 0001413323 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 7,249.609

F1 · kind: These restricted stock units become fully vested on the day prior to the first annual meeting of shareholders following the date of grant (or if no such meeting is held within 13 months after the date of grant, on the 13 month anniversary of the date of grant).

F2 · price: Each restricted stock unit represents the contingent right to receive one share of common stock of MKS Instruments, Inc.

SEC source: 0001127602-23-015869 · form4.xml · nonDerivative · entry 1

Moloney Jacqueline F · CIK 0001501968 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 12,053.434

F1 · kind: These restricted stock units become fully vested on the day prior to the first annual meeting of shareholders following the date of grant (or if no such meeting is held within 13 months after the date of grant, on the 13 month anniversary of the date of grant).

F2 · price: Each restricted stock unit represents the contingent right to receive one share of common stock of MKS Instruments, Inc.

SEC source: 0001127602-23-015863 · form4.xml · nonDerivative · entry 1

CANNONE PETER III · CIK 0001276985 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,510.944

F1 · kind: These restricted stock units become fully vested on the day prior to the first annual meeting of shareholders following the date of grant (or if no such meeting is held within 13 months after the date of grant, on the 13 month anniversary of the date of grant).

F2 · price: Each restricted stock unit represents the contingent right to receive one share of common stock of MKS Instruments, Inc.

SEC source: 0001127602-23-015860 · form4.xml · nonDerivative · entry 1

Batra Raj · CIK 0001754514 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 11,344.203

F1 · kind: These restricted stock units become fully vested on the day prior to the first annual meeting of shareholders following the date of grant (or if no such meeting is held within 13 months after the date of grant, on the 13 month anniversary of the date of grant).

F2 · price: Each restricted stock unit represents the contingent right to receive one share of common stock of MKS Instruments, Inc.

SEC source: 0001127602-23-015858 · form4.xml · nonDerivative · entry 1

COLELLA GERARD G · CIK 0001256715 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,115.791

F1 · kind: These restricted stock units become fully vested on the day prior to the first annual meeting of shareholders following the date of grant (or if no such meeting is held within 13 months after the date of grant, on the 13 month anniversary of the date of grant).

F2 · price: Each restricted stock unit represents the contingent right to receive one share of common stock of MKS Instruments, Inc.

SEC source: 0001127602-23-015342 · form4.xml · nonDerivative · entry 1

COLELLA GERARD G · CIK 0001256715 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · By The Gerald G. Colella Living Trust

Disclosed balance after: 98,017

SEC source: 0000899243-23-012509 · doc4.xml · nonDerivative · entry 1

Carlyle Partners VI Cayman Holdings, L.P. · CIK 0001838776 · 10% owner

CEP IV Managing GP Holdings, Ltd. · CIK 0001944603 · 10% owner

CAP IV General Partner, L.P. · CIK 0001944819 · 10% owner

Carlyle Asia Partners IV, L.P. · CIK 0001563274 · 10% owner

Gamma Holding Co Ltd · CIK 0001944422 · 10% owner

CEP IV Participations, S.a r.l. SICAR · CIK 0001944424 · 10% owner

CEP IV Managing GP, L.P. · CIK 0001944602 · 10% owner

CAP IV, L.L.C. · CIK 0001945338 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnotes

Disclosed balance after: 6,482,732

F1 · ownership.nature: Following the transactions reported herein, includes (i) 3,958,719 shares held by Carlyle Partners VI Cayman Holdings, L.P., (ii) 1,726,956 shares held by CEP IV Participations, S.a r.l. SICAR and (iii) 797,057 shares held by Gamma Holding Company Limited.

F2 · ownership.nature: The Carlyle Group Inc., which is a publicly traded entity listed on Nasdaq, is the sole member of Carlyle Holdings II GP L.L.C., which is the managing member of Carlyle Holdings II L.L.C., which, with respect to the securities reported herein, is the managing member of CG Subsidiary Holdings L.L.C., which is the general partner of TC Group Cayman Investment Holdings, L.P., which is the general partner of TC Group Cayman Investment Holdings Sub L.P., which is the sole shareholder of TC Group VI Cayman, L.L.C., which is the general partner of TC Group VI Cayman, L.P., which is the general partner of Carlyle Partners VI Cayman Holdings, L.P.

F3 · ownership.nature: TC Group Cayman Investment Holdings Sub L.P. is also the sole shareholder of CEP IV Managing GP Holdings, Ltd. and the sole member of CAP IV, L.L.C. CEP IV Managing GP Holdings, Ltd. is the general partner of CEP IV Managing GP, L.P., which is the managing general partner of Carlyle Europe Partners IV, L.P., which is the majority shareholder of CEP IV Participations, S.a r.l. SICAR. CAP IV, L.L.C. is the general partner of CAP IV General Partner, L.P., which is the general partner of Carlyle Asia Partners IV, L.P., which is the majority shareholder of Gamma Holding Company Limited.

F4 · ownership.nature: Accordingly, each of these entities may be deemed to share beneficial ownership of the securities held of record by Carlyle Partners VI Cayman Holdings, L.P., CEP IV Participations, S.a r.l. SICAR and Gamma Holding Company Limited. Each of them disclaims beneficial ownership of such securities.

SEC source: 0000899243-23-012504 · doc4.xml · nonDerivative · entry 1

Carlyle Group Inc. · CIK 0001527166 · 10% owner

Carlyle Holdings II GP L.L.C. · CIK 0001548629 · 10% owner

Carlyle Holdings II L.L.C. · CIK 0001548630 · 10% owner

CG Subsidiary Holdings L.L.C. · CIK 0001790577 · 10% owner

TC Group Cayman Investment Holdings, L.P. · CIK 0001475444 · 10% owner

TC Group Cayman Investment Holdings Sub L.P. · CIK 0001548636 · 10% owner

TC Group VI Cayman, L.L.C. · CIK 0001838774 · 10% owner

TC Group VI Cayman, L.P. · CIK 0001838781 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnotes

Disclosed balance after: 6,482,732

F1 · ownership.nature: Following the transactions reported herein, includes (i) 3,958,719 shares held by Carlyle Partners VI Cayman Holdings, L.P., (ii) 1,726,956 shares held by CEP IV Participations, S.a r.l. SICAR and (iii) 797,057 shares held by Gamma Holding Company Limited.

F2 · ownership.nature: The Carlyle Group Inc., which is a publicly traded entity listed on Nasdaq, is the sole member of Carlyle Holdings II GP L.L.C., which is the managing member of Carlyle Holdings II L.L.C., which, with respect to the securities reported herein, is the managing member of CG Subsidiary Holdings L.L.C., which is the general partner of TC Group Cayman Investment Holdings, L.P., which is the general partner of TC Group Cayman Investment Holdings Sub L.P., which is the sole shareholder of TC Group VI Cayman, L.L.C., which is the general partner of TC Group VI Cayman, L.P., which is the general partner of Carlyle Partners VI Cayman Holdings, L.P.

F3 · ownership.nature: TC Group Cayman Investment Holdings Sub L.P. is also the sole shareholder of CEP IV Managing GP Holdings, Ltd. and the sole member of CAP IV, L.L.C. CEP IV Managing GP Holdings, Ltd. is the general partner of CEP IV Managing GP, L.P., which is the managing general partner of Carlyle Europe Partners IV, L.P., which is the majority shareholder of CEP IV Participations, S.a r.l. SICAR. CAP IV, L.L.C. is the general partner of CAP IV General Partner, L.P., which is the general partner of Carlyle Asia Partners IV, L.P., which is the majority shareholder of Gamma Holding Company Limited.

F4 · ownership.nature: Accordingly, each of these entities may be deemed to share beneficial ownership of the securities held of record by Carlyle Partners VI Cayman Holdings, L.P., CEP IV Participations, S.a r.l. SICAR and Gamma Holding Company Limited. Each of them disclaims beneficial ownership of such securities.

SEC source: 0001127602-23-013192 · form4.xml · derivative · entry 3

Gitin Mark Milton · CIK 0001842711 · EVP & GM, PSD

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 9,081.455

Underlying: Common Stock · 1,797.417 shares

Expires not disclosed

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 · derivative.exercise_price: Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Instruments, Inc.

F1 · price: Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Instruments, Inc.

F3 · derivative.exercise_date: These RSUs vest in three equal annual installments commencing on April 17, 2021, provided that if, in any vesting year, April 17th is not a business day, such vesting shall occur on the next business day.

F3 · derivative.expiration_date: These RSUs vest in three equal annual installments commencing on April 17, 2021, provided that if, in any vesting year, April 17th is not a business day, such vesting shall occur on the next business day.

SEC source: 0001127602-23-013192 · form4.xml · nonDerivative · entry 2

Gitin Mark Milton · CIK 0001842711 · EVP & GM, PSD

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 11,568.467

F2 · kind: These shares were withheld by MKS Instruments, Inc. to satisfy the tax withholding obligations triggered by the vesting of RSUs and do not represent a discretionary trade by the reporting person.

SEC source: 0001127602-23-013192 · form4.xml · nonDerivative · entry 1

Gitin Mark Milton · CIK 0001842711 · EVP & GM, PSD

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 12,190.467

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 · price: Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Instruments, Inc.

SEC source: 0001127602-23-013194 · form4.xml · derivative · entry 3

Taranto Eric Robert · CIK 0001842235 · EVP & GM, VSD

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 7,749.731

Underlying: Common Stock · 934.537 shares

Expires not disclosed

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 · derivative.exercise_price: Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Instruments, Inc.

F1 · price: Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Instruments, Inc.

F3 · derivative.exercise_date: These RSUs vest in three equal annual installments commencing on April 17, 2021, provided that if, in any vesting year, April 17th is not a business day, such vesting shall occur on the next business day.

F3 · derivative.expiration_date: These RSUs vest in three equal annual installments commencing on April 17, 2021, provided that if, in any vesting year, April 17th is not a business day, such vesting shall occur on the next business day.

SEC source: 0001127602-23-013194 · form4.xml · nonDerivative · entry 2

Taranto Eric Robert · CIK 0001842235 · EVP & GM, VSD

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 8,710.3104

F2 · kind: These shares were withheld by MKS Instruments, Inc. to satisfy the tax withholding obligations triggered by the vesting of RSUs and do not represent a discretionary trade by the reporting person.

SEC source: 0001127602-23-013194 · form4.xml · nonDerivative · entry 1

Taranto Eric Robert · CIK 0001842235 · EVP & GM, VSD

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 8,985.3104

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 · price: Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Instruments, Inc.

SEC source: 0001127602-23-010434 · form4.xml · nonDerivative · entry 1

Mora Elizabeth · CIK 0001548935 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 15,693.151

F1 · kind: This transaction was effected pursuant to a Rule 10b5-1 trading plan previously adopted by the reporting person.

SEC source: 0001127602-23-010430 · form4.xml · nonDerivative · entry 1

Moloney Jacqueline F · CIK 0001501968 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 9,684.327

F1 · kind: This transaction was effected pursuant to a Rule 10b5-1 trading plan previously adopted by the reporting person.

SEC source: 0001127602-23-005509 · form4.xml · derivative · entry 10

Gitin Mark Milton · CIK 0001842711 · EVP & GM, PSD

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 10,878.872

Underlying: Common Stock · 906 shares

Expires not disclosed

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 · derivative.exercise_price: Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Instruments, Inc.

F1 · price: Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Instruments, Inc.

F7 · derivative.exercise_date: These RSUs vest in three equal annual installments commencing on February 15, 2023, provided that if, in any vesting year, February 15th is not a business day, such vesting shall occur on the next business day.

F7 · derivative.expiration_date: These RSUs vest in three equal annual installments commencing on February 15, 2023, provided that if, in any vesting year, February 15th is not a business day, such vesting shall occur on the next business day.

SEC source: 0001127602-23-005509 · form4.xml · derivative · entry 9

Gitin Mark Milton · CIK 0001842711 · EVP & GM, PSD

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 11,784.872

Underlying: Common Stock · 1,260 shares

Expires not disclosed

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 · derivative.exercise_price: Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Instruments, Inc.

F1 · price: Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Instruments, Inc.

F6 · derivative.exercise_date: These RSUs were subject to performance criteria, the achievement of which was determined on February 8, 2023, and thereafter vest in three equal annual installments beginning on February 15, 2023, provided that if, in any vesting year, February 15th is not a business day, such vesting shall occur on the next business day.

F6 · derivative.expiration_date: These RSUs were subject to performance criteria, the achievement of which was determined on February 8, 2023, and thereafter vest in three equal annual installments beginning on February 15, 2023, provided that if, in any vesting year, February 15th is not a business day, such vesting shall occur on the next business day.

SEC source: 0001127602-23-005509 · form4.xml · derivative · entry 8

Gitin Mark Milton · CIK 0001842711 · EVP & GM, PSD

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 13,044.872

Underlying: Common Stock · 552 shares

Expires not disclosed

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 · derivative.exercise_price: Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Instruments, Inc.

F1 · price: Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Instruments, Inc.

F5 · derivative.exercise_date: These RSUs vest in three equal annual installments commencing on February 15, 2022, provided that if, in any vesting year, February 15th is not a business day, such vesting shall occur on the next business day.

F5 · derivative.expiration_date: These RSUs vest in three equal annual installments commencing on February 15, 2022, provided that if, in any vesting year, February 15th is not a business day, such vesting shall occur on the next business day.

SEC source: 0001127602-23-005509 · form4.xml · derivative · entry 7

Gitin Mark Milton · CIK 0001842711 · EVP & GM, PSD

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 13,596.872

Underlying: Common Stock · 1,103 shares

Expires not disclosed

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 · derivative.exercise_price: Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Instruments, Inc.

F1 · price: Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Instruments, Inc.

F4 · derivative.exercise_date: These RSUs were subject to performance criteria, the achievement of which was determined on January 21, 2022, and thereafter vest in three equal annual installments beginning on February 15, 2022, provided that if, in any vesting year, February 15th is not a business day, such vesting shall occur on the next business day.

F4 · derivative.expiration_date: These RSUs were subject to performance criteria, the achievement of which was determined on January 21, 2022, and thereafter vest in three equal annual installments beginning on February 15, 2022, provided that if, in any vesting year, February 15th is not a business day, such vesting shall occur on the next business day.

SEC source: 0001127602-23-005509 · form4.xml · derivative · entry 6

Gitin Mark Milton · CIK 0001842711 · EVP & GM, PSD

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 14,699.872

Underlying: Common Stock · 3,091.036 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Instruments, Inc.

F1 · price: Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Instruments, Inc.

F3 · derivative.exercise_date: These RSUs vest in three equal annual installments commencing on February 15, 2024, provided that if, in any vesting year, February 15th is not a business day, such vesting shall occur on the next business day.

F3 · derivative.expiration_date: These RSUs vest in three equal annual installments commencing on February 15, 2024, provided that if, in any vesting year, February 15th is not a business day, such vesting shall occur on the next business day.

SEC source: 0001127602-23-005509 · form4.xml · nonDerivative · entry 5

Gitin Mark Milton · CIK 0001842711 · EVP & GM, PSD

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 10,393.05

F2 · kind: This transaction was effected pursuant to a Rule 10b5-1 trading plan previously adopted by the reporting person.

SEC source: 0001127602-23-005509 · form4.xml · nonDerivative · entry 4

Gitin Mark Milton · CIK 0001842711 · EVP & GM, PSD

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 11,716.05

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 · price: Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Instruments, Inc.

SEC source: 0001127602-23-005509 · form4.xml · nonDerivative · entry 3

Gitin Mark Milton · CIK 0001842711 · EVP & GM, PSD

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 10,810.05

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 · price: Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Instruments, Inc.

SEC source: 0001127602-23-005509 · form4.xml · nonDerivative · entry 2

Gitin Mark Milton · CIK 0001842711 · EVP & GM, PSD

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 9,550.05

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 · price: Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Instruments, Inc.

SEC source: 0001127602-23-005509 · form4.xml · nonDerivative · entry 1

Gitin Mark Milton · CIK 0001842711 · EVP & GM, PSD

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 8,998.05

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 · price: Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Instruments, Inc.