MKSI

SEC source: 0001127602-22-001955 · form4.xml · derivative · entry 1

Gitin Mark Milton · CIK 0001842711 · SVP & GM, L&M Division

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 8,559.574

Underlying: Common Stock · 3,310.105 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.

F2 · derivative.exercise_date: These RSUs were subject to performance criteria, 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.

F2 · derivative.expiration_date: These RSUs were subject to performance criteria, 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: 0001127602-22-001951 · form4.xml · derivative · entry 1

BAGSHAW SETH H · CIK 0001192439 · Sr. VP, CFO & Treasurer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 38,208.599

Underlying: Common Stock · 11,657.956 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.

F2 · derivative.exercise_date: These RSUs were subject to performance criteria, 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.

F2 · derivative.expiration_date: These RSUs were subject to performance criteria, 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: 0001127602-22-001961 · form4.xml · derivative · entry 1

Taranto Eric Robert · CIK 0001842235 · SVP & GM, V&A Division

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 6,140.557

Underlying: Common Stock · 2,322.88 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.

F2 · derivative.exercise_date: These RSUs were subject to performance criteria, 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.

F2 · derivative.expiration_date: These RSUs were subject to performance criteria, 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: 0001127602-22-001959 · form4.xml · derivative · entry 1

Schreiner James Alan · CIK 0001797189 · Sr. VP & COO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 10,707.003

Underlying: Common Stock · 3,919.861 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.

F2 · derivative.exercise_date: These RSUs were subject to performance criteria, 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.

F2 · derivative.expiration_date: These RSUs were subject to performance criteria, 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: 0001127602-22-001957 · form4.xml · derivative · entry 1

Henry David Philip · CIK 0001842459 · SVP, Corp Mkt, PMO & Glob Svc

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 8,048.598

Underlying: Common Stock · 3,484.321 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.

F2 · derivative.exercise_date: These RSUs were subject to performance criteria, 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.

F2 · derivative.expiration_date: These RSUs were subject to performance criteria, 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: 0001127602-22-001953 · form4.xml · derivative · entry 1

Burke Kathleen Flaherty · CIK 0001775435 · Sr. VP, GC & Secretary

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 20,441.111

Underlying: Common Stock · 6,097.561 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.

F2 · derivative.exercise_date: These RSUs were subject to performance criteria, 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.

F2 · derivative.expiration_date: These RSUs were subject to performance criteria, 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: 0001127602-22-001949 · form4.xml · derivative · entry 1

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 70,138.612

Underlying: Common Stock · 28,873.403 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.

F2 · derivative.exercise_date: These RSUs were subject to performance criteria, 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.

F2 · derivative.expiration_date: These RSUs were subject to performance criteria, 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: 0001127602-22-001398 · form4.xml · derivative · entry 3

Gitin Mark Milton · CIK 0001842711 · SVP & GM, L&M Division

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 5,249.469

Underlying: Common Stock · 2,283.439 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 vested on January 11, 2022.

F3 · derivative.expiration_date: These RSUs vested on January 11, 2022.

SEC source: 0001127602-22-001398 · form4.xml · nonDerivative · entry 2

Gitin Mark Milton · CIK 0001842711 · SVP & GM, L&M Division

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 5,937.15

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

SEC source: 0001127602-22-001398 · form4.xml · nonDerivative · entry 1

Gitin Mark Milton · CIK 0001842711 · SVP & GM, L&M Division

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 6,778.15

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: 0001127602-21-030391 · form4.xml · derivative · entry 5

BAGSHAW SETH H · CIK 0001192439 · Sr. VP, CFO & Treasurer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 26,550.643

Underlying: Common Stock · 194 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 represents the contingent right to receive one share of common stock of MKS Instruments, Inc.

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

F4 · derivative.exercise_date: Portion of 2021 RSU Award accelerated to satisfy FICA taxes.

F4 · derivative.expiration_date: Portion of 2021 RSU Award accelerated to satisfy FICA taxes.

SEC source: 0001127602-21-030391 · form4.xml · derivative · entry 4

BAGSHAW SETH H · CIK 0001192439 · Sr. VP, CFO & Treasurer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 26,744.643

Underlying: Common Stock · 325 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 represents the contingent right to receive one share of common stock of MKS Instruments, Inc.

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

F3 · derivative.exercise_date: Portion of 2020 RSU Award accelerated to satisfy FICA taxes.

F3 · derivative.expiration_date: Portion of 2020 RSU Award accelerated to satisfy FICA taxes.

SEC source: 0001127602-21-030391 · form4.xml · nonDerivative · entry 3

BAGSHAW SETH H · CIK 0001192439 · Sr. VP, CFO & Treasurer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 21,992.122

F2 · kind: Shares used to satisfy FICA taxes.

SEC source: 0001127602-21-030391 · form4.xml · nonDerivative · entry 2

BAGSHAW SETH H · CIK 0001192439 · Sr. VP, CFO & Treasurer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 22,511.122

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 represents the contingent right to receive one share of common stock of MKS Instruments, Inc.

SEC source: 0001127602-21-030391 · form4.xml · nonDerivative · entry 1

BAGSHAW SETH H · CIK 0001192439 · Sr. VP, CFO & Treasurer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 22,317.122

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 represents the contingent right to receive one share of common stock of MKS Instruments, Inc.

SEC source: 0001127602-21-030032 · form4.xml · nonDerivative · entry 1

Mora Elizabeth · CIK 0001548935 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 14,848.103

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

SEC source: 0001127602-21-028977 · form4.xml · nonDerivative · entry 1

Moloney Jacqueline F · CIK 0001501968 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 8,614.279

SEC source: 0001127602-21-028619 · form4.xml · nonDerivative · entry 1

COLELLA GERARD G · CIK 0001256715 · Director

10b5-1 filing: Not disclosed

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

Disclosed balance after: 97,000

F1 · price: This transaction was executed in multiple trades at prices ranging from $153.03 to $156.95. 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: 0001127602-21-027839 · form4.xml · derivative · entry 3

Burke Kathleen Flaherty · CIK 0001775435 · Sr. VP, GC & Secretary

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 14,343.55

Underlying: Common Stock · 2,179.029 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 represents the contingent right to receive one share of common stock of MKS Instruments, Inc.

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

F3 · derivative.exercise_date: These RSUs vest in two equal annual installments on each of the second anniversary and third anniversary of the date of grant, October 28, 2019.

F3 · derivative.expiration_date: These RSUs vest in two equal annual installments on each of the second anniversary and third anniversary of the date of grant, October 28, 2019.

SEC source: 0001127602-21-027839 · form4.xml · nonDerivative · entry 2

Burke Kathleen Flaherty · CIK 0001775435 · Sr. VP, GC & Secretary

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 40,731.539

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

SEC source: 0001127602-21-027839 · form4.xml · nonDerivative · entry 1

Burke Kathleen Flaherty · CIK 0001775435 · Sr. VP, GC & Secretary

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 41,698.539

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 represents the contingent right to receive one share of common stock of MKS Instruments, Inc.

SEC source: 0001127602-21-027837 · form4.xml · derivative · entry 3

BAGSHAW SETH H · CIK 0001192439 · Sr. VP, CFO & Treasurer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 27,069.643

Underlying: Common Stock · 4,358.058 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 represents the contingent right to receive one share of common stock of MKS Instruments, Inc.

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

F3 · derivative.exercise_date: These RSUs vest in two equal annual installments on each of the second anniversary and third anniversary of the date of grant, October 28, 2019.

F3 · derivative.expiration_date: These RSUs vest in two equal annual installments on each of the second anniversary and third anniversary of the date of grant, October 28, 2019.

SEC source: 0001127602-21-027837 · form4.xml · nonDerivative · entry 2

BAGSHAW SETH H · CIK 0001192439 · Sr. VP, CFO & Treasurer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 21,924.751

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

SEC source: 0001127602-21-027837 · form4.xml · nonDerivative · entry 1

BAGSHAW SETH H · CIK 0001192439 · Sr. VP, CFO & Treasurer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 23,857.751

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 represents the contingent right to receive one share of common stock of MKS Instruments, Inc.

SEC source: 0001127602-21-027451 · form4.xml · nonDerivative · entry 1

COLELLA GERARD G · CIK 0001256715 · Director

10b5-1 filing: Not disclosed

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

Disclosed balance after: 100,000

SEC source: 0001127602-21-025434 · form4.xml · derivative · entry 3

Schreiner James Alan · CIK 0001797189 · Sr. VP & COO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 6,787.142

Underlying: Common Stock · 1,434 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 represents the contingent right to receive one share of common stock of MKS Instruments, Inc.

F1 · price: Each restricted stock unit 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 September 16, 2020, provided that if, in any vesting year, September 16th 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 September 16, 2020, provided that if, in any vesting year, September 16th is not a business day, such vesting shall occur on the next business day.

SEC source: 0001127602-21-025434 · form4.xml · nonDerivative · entry 2

Schreiner James Alan · CIK 0001797189 · Sr. VP & COO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,273.181

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

SEC source: 0001127602-21-025434 · form4.xml · nonDerivative · entry 1

Schreiner James Alan · CIK 0001797189 · Sr. VP & COO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,727.181

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 represents the contingent right to receive one share of common stock of MKS Instruments, Inc.

SEC source: 0001127602-21-024757 · form4.xml · nonDerivative · entry 1

Mora Elizabeth · CIK 0001548935 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 15,148.103

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

SEC source: 0001127602-21-018643 · form4.xml · nonDerivative · entry 1

Mora Elizabeth · CIK 0001548935 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 15,448.103

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

SEC source: 0001127602-21-017703 · form4.xml · nonDerivative · entry 1

Henry David Philip · CIK 0001842459 · SVP, Corp Mkt, PMO & Glob Svc

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,805.58

SEC source: 0001127602-21-016411 · form4.xml · nonDerivative · entry 1

Warner Michelle M · CIK 0001661884 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 5,115.883

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: 0001127602-21-016409 · form4.xml · nonDerivative · entry 1

Mora Elizabeth · CIK 0001548935 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 15,748.103

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: 0001127602-21-016407 · form4.xml · nonDerivative · entry 1

Moloney Jacqueline F · CIK 0001501968 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 8,938.279

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: 0001127602-21-016402 · form4.xml · nonDerivative · entry 1

Donahue Joseph B · CIK 0001413323 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,135.454

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: 0001127602-21-016399 · form4.xml · nonDerivative · entry 1

COLELLA GERARD G · CIK 0001256715 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,136.636

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: 0001127602-21-016385 · form4.xml · nonDerivative · entry 1

CANNONE PETER III · CIK 0001276985 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,146.789

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: 0001127602-21-016391 · form4.xml · nonDerivative · entry 1

Batra Raj · CIK 0001754514 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 7,230.048

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: 0001127602-21-014915 · form4.xml · nonDerivative · entry 1

Gitin Mark Milton · CIK 0001842711 · SVP & GM, L&M Division

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 4,338.054

SEC source: 0001127602-21-014751 · form4.xml · nonDerivative · entry 1

Taranto Eric Robert · CIK 0001842235 · SVP & GM, V&A Division

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,505.5164

F1 · price: This transaction was executed in multiple trades at prices ranging from $185.27 to $185.36. 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: 0001127602-21-014123 · form4.xml · derivative · entry 3

Taranto Eric Robert · CIK 0001842235 · SVP & GM, V&A Division

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,817.677

Underlying: Common Stock · 934 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: 0001127602-21-014123 · form4.xml · nonDerivative · entry 2

Taranto Eric Robert · CIK 0001842235 · SVP & GM, V&A Division

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 5,293.5164

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

SEC source: 0001127602-21-014123 · form4.xml · nonDerivative · entry 1

Taranto Eric Robert · CIK 0001842235 · SVP & GM, V&A Division

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 5,568.5164

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: 0001127602-21-014191 · form4.xml · derivative · entry 3

Gitin Mark Milton · CIK 0001842711 · SVP & GM, L&M Division

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 7,532.908

Underlying: Common Stock · 1,797 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: 0001127602-21-014191 · form4.xml · nonDerivative · entry 2

Gitin Mark Milton · CIK 0001842711 · SVP & GM, L&M Division

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 5,709.054

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

SEC source: 0001127602-21-014191 · form4.xml · nonDerivative · entry 1

Gitin Mark Milton · CIK 0001842711 · SVP & GM, L&M Division

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 6,600.054

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: 0001127602-21-013895 · form4.xml · nonDerivative · entry 5

BAGSHAW SETH H · CIK 0001192439 · Sr. VP, CFO & Treasurer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 19,410.407

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

F6 · price: This transaction was executed in multiple trades at prices ranging from $188.38 to 188.40. 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: 0001127602-21-013895 · form4.xml · nonDerivative · entry 4

BAGSHAW SETH H · CIK 0001192439 · Sr. VP, CFO & Treasurer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 19,610.407

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

F5 · price: This transaction was executed in multiple trades at prices ranging from $187.31 to 188.30. 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: 0001127602-21-013895 · form4.xml · nonDerivative · entry 3

BAGSHAW SETH H · CIK 0001192439 · Sr. VP, CFO & Treasurer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 24,565.407

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

F4 · price: This transaction was executed in multiple trades at prices ranging from $186.28 to 187.10. 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: 0001127602-21-013895 · form4.xml · nonDerivative · entry 2

BAGSHAW SETH H · CIK 0001192439 · Sr. VP, CFO & Treasurer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 26,306.407

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

F3 · price: This transaction was executed in multiple trades at prices ranging from $185.14 to 185.77. 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.