MKSI

SEC source: 0001127602-17-006624 · form4.xml · nonDerivative · entry 3

COLELLA GERARD G · CIK 0001256715 · Director · CEO, President, Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 85,514.984

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: 0001127602-17-006624 · form4.xml · nonDerivative · entry 2

COLELLA GERARD G · CIK 0001256715 · Director · CEO, President, Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 69,861.984

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: 0001127602-17-006624 · form4.xml · nonDerivative · entry 1

COLELLA GERARD G · CIK 0001256715 · Director · CEO, President, Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 60,405.984

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: 0001127602-17-006631 · form4.xml · derivative · entry 11

BAGSHAW SETH H · CIK 0001192439 · Vice President, CFO, Treasurer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 21,676.204

Underlying: Common Stock · 4,515 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.

F8 · derivative.exercise_date: These RSUs vest in three equal annual installments commencing on February 15, 2017, provided that if, in any vesting year, February 15th is not a business day, such vesting shall occur on the next business day.

F8 · derivative.expiration_date: These RSUs vest in three equal annual installments commencing on February 15, 2017, 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: 0001127602-17-006631 · form4.xml · derivative · entry 10

BAGSHAW SETH H · CIK 0001192439 · Vice President, CFO, Treasurer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 38,285.381

Underlying: Common Stock · 6,913 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.

F7 · derivative.exercise_date: These RSUs are subject to the achievement of performance criteria determined in the first year of grant and thereafter vest in three equal annual installments beginning on February 15, 2017, 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 are subject to the achievement of performance criteria determined in the first year of grant and thereafter vest in three equal annual installments beginning on February 15, 2017, 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: 0001127602-17-006631 · form4.xml · derivative · entry 9

BAGSHAW SETH H · CIK 0001192439 · Vice President, CFO, Treasurer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 26,191.204

Underlying: Common Stock · 3,783 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.

F6 · derivative.exercise_date: These RSUs vest in three equal annual installments commencing on February 15, 2016, 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 vest in three equal annual installments commencing on February 15, 2016, 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: 0001127602-17-006631 · form4.xml · derivative · entry 8

BAGSHAW SETH H · CIK 0001192439 · Vice President, CFO, Treasurer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 45,198.381

Underlying: Common Stock · 5,234 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.

F5 · derivative.exercise_date: These RSUs are subject to the achievement of performance criteria determined in the first year of grant and thereafter vest in three equal annual installments beginning on February 15, 2016, 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 are subject to the achievement of performance criteria determined in the first year of grant and thereafter vest in three equal annual installments beginning on February 15, 2016, 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: 0001127602-17-006631 · form4.xml · derivative · entry 7

BAGSHAW SETH H · CIK 0001192439 · Vice President, CFO, Treasurer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 29,974.204

Underlying: Common Stock · 8,862.629 shares

Expires not disclosed

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: These RSUs vest in three equal annual installments commencing on February 15, 2018, 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 vest in three equal annual installments commencing on February 15, 2018, 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: 0001127602-17-006631 · form4.xml · derivative · entry 6

BAGSHAW SETH H · CIK 0001192439 · Vice President, CFO, Treasurer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 50,432.381

Underlying: Common Stock · 13,293.944 shares

Expires not disclosed

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 are subject to the achievement of performance criteria determined in the first year of grant and thereafter vest in three equal annual installments beginning on February 15, 2018, 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 are subject to the achievement of performance criteria determined in the first year of grant and thereafter vest in three equal annual installments beginning on February 15, 2018, 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: 0001127602-17-006631 · form4.xml · nonDerivative · entry 5

BAGSHAW SETH H · CIK 0001192439 · Vice President, CFO, Treasurer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 38,245.593

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

SEC source: 0001127602-17-006631 · form4.xml · nonDerivative · entry 4

BAGSHAW SETH H · CIK 0001192439 · Vice President, CFO, Treasurer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 47,263.593

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: 0001127602-17-006631 · form4.xml · nonDerivative · entry 3

BAGSHAW SETH H · CIK 0001192439 · Vice President, CFO, Treasurer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 42,748.593

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: 0001127602-17-006631 · form4.xml · nonDerivative · entry 2

BAGSHAW SETH H · CIK 0001192439 · Vice President, CFO, Treasurer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 35,835.593

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: 0001127602-17-006631 · form4.xml · nonDerivative · entry 1

BAGSHAW SETH H · CIK 0001192439 · Vice President, CFO, Treasurer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 32,052.593

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: 0001127602-17-006774 · form4.xml · derivative · entry 12

Werth Dennis L · CIK 0001550572 · Sr. VP, Business Units

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 31,279.275

Underlying: Common Stock · 732 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.

F7 · derivative.exercise_date: These RSUs vest in three annual installments as follows: 20% of the RSUs vests on February 15, 2017, 30% of the RSUs vests on February 15, 2018 and the remaining 50% of the RSUs vests on February 15, 2019, 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 annual installments as follows: 20% of the RSUs vests on February 15, 2017, 30% of the RSUs vests on February 15, 2018 and the remaining 50% of the RSUs vests on February 15, 2019, 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: 0001127602-17-006774 · form4.xml · derivative · entry 11

Werth Dennis L · CIK 0001550572 · Sr. VP, Business Units

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 32,011.275

Underlying: Common Stock · 2,705 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.

F7 · derivative.exercise_date: These RSUs vest in three annual installments as follows: 20% of the RSUs vests on February 15, 2017, 30% of the RSUs vests on February 15, 2018 and the remaining 50% of the RSUs vests on February 15, 2019, 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 annual installments as follows: 20% of the RSUs vests on February 15, 2017, 30% of the RSUs vests on February 15, 2018 and the remaining 50% of the RSUs vests on February 15, 2019, 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: 0001127602-17-006774 · form4.xml · derivative · entry 10

Werth Dennis L · CIK 0001550572 · Sr. VP, Business Units

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 34,716.275

Underlying: Common Stock · 2,033 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.

F6 · derivative.exercise_date: These RSUs vest in three equal annual installments commencing on February 15, 2017, 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 vest in three equal annual installments commencing on February 15, 2017, 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: 0001127602-17-006774 · form4.xml · derivative · entry 9

Werth Dennis L · CIK 0001550572 · Sr. VP, Business Units

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 11,781.332

Underlying: Common Stock · 2,013 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.

F5 · derivative.exercise_date: These RSUs are subject to the achievement of performance criteria determined in the first year of grant and thereafter vest in three equal annual installments beginning on February 15, 2017, 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 are subject to the achievement of performance criteria determined in the first year of grant and thereafter vest in three equal annual installments beginning on February 15, 2017, 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: 0001127602-17-006774 · form4.xml · derivative · entry 8

Werth Dennis L · CIK 0001550572 · Sr. VP, Business Units

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 36,749.275

Underlying: Common Stock · 427 shares

Expires not disclosed

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: These RSUs vest in three equal annual installments commencing on February 15, 2018, 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 vest in three equal annual installments commencing on February 15, 2018, 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: 0001127602-17-006774 · form4.xml · derivative · entry 7

Werth Dennis L · CIK 0001550572 · Sr. VP, Business Units

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 36,322.275

Underlying: Common Stock · 5,169.867 shares

Expires not disclosed

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: These RSUs vest in three equal annual installments commencing on February 15, 2018, 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 vest in three equal annual installments commencing on February 15, 2018, 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: 0001127602-17-006774 · form4.xml · derivative · entry 6

Werth Dennis L · CIK 0001550572 · Sr. VP, Business Units

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 13,794.332

Underlying: Common Stock · 7,754.801 shares

Expires not disclosed

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 are subject to the achievement of performance criteria determined in the first year of grant and thereafter vest in three equal annual installments beginning on February 15, 2018, 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 are subject to the achievement of performance criteria determined in the first year of grant and thereafter vest in three equal annual installments beginning on February 15, 2018, 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: 0001127602-17-006774 · form4.xml · nonDerivative · entry 5

Werth Dennis L · CIK 0001550572 · Sr. VP, Business Units

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 4,605

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

SEC source: 0001127602-17-006774 · form4.xml · nonDerivative · entry 4

Werth Dennis L · CIK 0001550572 · Sr. VP, Business Units

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 7,483

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: 0001127602-17-006774 · form4.xml · nonDerivative · entry 3

Werth Dennis L · CIK 0001550572 · Sr. VP, Business Units

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 6,751

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: 0001127602-17-006774 · form4.xml · nonDerivative · entry 2

Werth Dennis L · CIK 0001550572 · Sr. VP, Business Units

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 4,046

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: 0001127602-17-006774 · form4.xml · nonDerivative · entry 1

Werth Dennis L · CIK 0001550572 · Sr. VP, Business Units

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 2,013

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: 0001127602-17-006165 · form4.xml · derivative · entry 6

Lee John Tseng-Chung · CIK 0001414656 · Sr. VP & COO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 26,771.02

Underlying: Common Stock · 2,408.188 shares

Expires not disclosed

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

F5 · kind: This transaction reflects the forfeiture of RSUs due to performance criteria.

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

F6 · derivative.exercise_date: These RSUs are subject to the achievement of performance criteria determined in the first year of grant and thereafter vest in three equal annual installments beginning on February 15, 2017, 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 are subject to the achievement of performance criteria determined in the first year of grant and thereafter vest in three equal annual installments beginning on February 15, 2017, 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: 0001127602-17-006148 · form4.xml · derivative · entry 1

Werth Dennis L · CIK 0001550572 · Sr. VP, Business Units

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 6,039.531

Underlying: Common Stock · 3,111.274 shares

Expires not disclosed

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

F2 · kind: This transaction reflects the forfeiture of RSUs due to performance criteria.

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 are subject to the achievement of performance criteria determined in the first year of grant and thereafter vest in three equal annual installments beginning on February 15, 2017, 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 are subject to the achievement of performance criteria determined in the first year of grant and thereafter vest in three equal annual installments beginning on February 15, 2017, 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: 0001127602-17-006146 · form4.xml · derivative · entry 6

BAGSHAW SETH H · CIK 0001192439 · Vice President, CFO, Treasurer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 37,138.437

Underlying: Common Stock · 3,190.849 shares

Expires not disclosed

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

F5 · kind: This transaction reflects the forfeiture of RSUs due to performance criteria.

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

F6 · derivative.exercise_date: These RSUs are subject to the achievement of performance criteria determined in the first year of grant and thereafter vest in three equal installments beginning on February 15, 2017, 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 are subject to the achievement of performance criteria determined in the first year of grant and thereafter vest in three equal installments beginning on February 15, 2017, 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: 0001127602-17-006144 · form4.xml · derivative · entry 6

Quirk Brian Charles · CIK 0001600515 · Sr. VP, Global Operations

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 16,334.033

Underlying: Common Stock · 1,294.401 shares

Expires not disclosed

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

F5 · kind: This transaction reflects the forfeiture of RSUs due to performance criteria.

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

F6 · derivative.exercise_date: These RSUs are subject to the achievement of performance criteria determined in the first year of grant and thereafter vest in three equal annual installments beginning on February 15, 2017, 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 are subject to the achievement of performance criteria determined in the first year of grant and thereafter vest in three equal annual installments beginning on February 15, 2017, 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: 0001127602-17-006135 · form4.xml · derivative · entry 6

Abrams John R · CIK 0001600505 · Sr. VP, Global Sales & Service

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 14,281.547

Underlying: Common Stock · 1,204.095 shares

Expires not disclosed

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

F5 · kind: This transaction reflects the forfeiture of RSUs due to performance criteria.

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

F6 · derivative.exercise_date: These RSUs are subject to the achievement of performance criteria determined in the first year of grant and thereafter vest in three equal annual installments beginning on February 15, 2017, 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 are subject to the achievement of performance criteria determined in the first year of grant and thereafter vest in three equal annual installments beginning on February 15, 2017, 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: 0001127602-17-006132 · form4.xml · derivative · entry 6

COLELLA GERARD G · CIK 0001256715 · Director · CEO, President, Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 80,873.627

Underlying: Common Stock · 7,224.563 shares

Expires not disclosed

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

F5 · kind: This transaction reflects the forfeiture of RSUs due to performance criteria.

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

F6 · derivative.exercise_date: These RSUs are subject to the achievement of performance criteria determined in the first year of grant and thereafter vest in three equal annual installments beginning on February 15, 2017, 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 are subject to the achievement of performance criteria determined in the first year of grant and thereafter vest in three equal annual installments beginning on February 15, 2017, 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: 0001127602-17-006165 · form4.xml · derivative · entry 5

Lee John Tseng-Chung · CIK 0001414656 · Sr. VP & COO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 21,937.797

Underlying: Common Stock · 2,869.815 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: The RSUs vest in equal annual installments over three years from the respective original grant date.

F4 · derivative.expiration_date: The RSUs vest in equal annual installments over three years from the respective original grant date.

SEC source: 0001127602-17-006165 · form4.xml · derivative · entry 4

Lee John Tseng-Chung · CIK 0001414656 · Sr. VP & COO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 29,179.208

Underlying: Common Stock · 4,305.223 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 are subject to the achievement of performance criteria determined in the first year of the grant and thereafter vest in equal annual installments over three years.

F3 · derivative.expiration_date: These RSUs are subject to the achievement of performance criteria determined in the first year of the grant and thereafter vest in equal annual installments over three years.

SEC source: 0001127602-17-006165 · form4.xml · nonDerivative · entry 3

Lee John Tseng-Chung · CIK 0001414656 · Sr. VP & COO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 5,100.753

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

SEC source: 0001127602-17-006165 · form4.xml · nonDerivative · entry 2

Lee John Tseng-Chung · CIK 0001414656 · Sr. VP & COO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 7,477.753

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: 0001127602-17-006165 · form4.xml · nonDerivative · entry 1

Lee John Tseng-Chung · CIK 0001414656 · Sr. VP & COO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 4,607.938

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: 0001127602-17-006146 · form4.xml · derivative · entry 5

BAGSHAW SETH H · CIK 0001192439 · Vice President, CFO, Treasurer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 21,111.575

Underlying: Common Stock · 4,305.223 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: The RSUs vest in equal annual installments over three years from the respective original grant date.

F4 · derivative.expiration_date: The RSUs vest in equal annual installments over three years from the respective original grant date.

SEC source: 0001127602-17-006146 · form4.xml · derivative · entry 4

BAGSHAW SETH H · CIK 0001192439 · Vice President, CFO, Treasurer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 40,329.286

Underlying: Common Stock · 6,456.835 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 are subject to the achievement of performance criteria determined in the first year of the grant and thereafter vest in equal annual installments over three years.

F3 · derivative.expiration_date: These RSUs are subject to the achievement of performance criteria determined in the first year of the grant and thereafter vest in equal annual installments over three years.

SEC source: 0001127602-17-006146 · form4.xml · nonDerivative · entry 3

BAGSHAW SETH H · CIK 0001192439 · Vice President, CFO, Treasurer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 26,818.593

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

SEC source: 0001127602-17-006146 · form4.xml · nonDerivative · entry 2

BAGSHAW SETH H · CIK 0001192439 · Vice President, CFO, Treasurer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 30,366.593

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: 0001127602-17-006146 · form4.xml · nonDerivative · entry 1

BAGSHAW SETH H · CIK 0001192439 · Vice President, CFO, Treasurer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 26,061.37

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: 0001127602-17-006144 · form4.xml · derivative · entry 5

Quirk Brian Charles · CIK 0001600515 · Sr. VP, Global Operations

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 10,018.154

Underlying: Common Stock · 2,009.171 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: The RSUs vest in equal annual installments over three years from the respective original grant date.

F4 · derivative.expiration_date: The RSUs vest in equal annual installments over three years from the respective original grant date.

SEC source: 0001127602-17-006144 · form4.xml · derivative · entry 4

Quirk Brian Charles · CIK 0001600515 · Sr. VP, Global Operations

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 17,628.434

Underlying: Common Stock · 3,013.256 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 are subject to the achievement of performance criteria determined in the first year of the grant and thereafter vest in equal annual installments over three years.

F3 · derivative.expiration_date: These RSUs are subject to the achievement of performance criteria determined in the first year of the grant and thereafter vest in equal annual installments over three years.

SEC source: 0001127602-17-006144 · form4.xml · nonDerivative · entry 3

Quirk Brian Charles · CIK 0001600515 · Sr. VP, Global Operations

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 12,541.945

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

SEC source: 0001127602-17-006144 · form4.xml · nonDerivative · entry 2

Quirk Brian Charles · CIK 0001600515 · Sr. VP, Global Operations

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 14,231.945

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: 0001127602-17-006144 · form4.xml · nonDerivative · entry 1

Quirk Brian Charles · CIK 0001600515 · Sr. VP, Global Operations

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 12,222.774

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: 0001127602-17-006135 · form4.xml · derivative · entry 5

Abrams John R · CIK 0001600505 · Sr. VP, Global Sales & Service

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 8,857.789

Underlying: Common Stock · 1,148.526 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: The RSUs vest in equal annual installments over three years from the respective original grant date.

F4 · derivative.expiration_date: The RSUs vest in equal annual installments over three years from the respective original grant date.

SEC source: 0001127602-17-006135 · form4.xml · derivative · entry 4

Abrams John R · CIK 0001600505 · Sr. VP, Global Sales & Service

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 15,485.642

Underlying: Common Stock · 1,722.289 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 are subject to the achievement of performance criteria determined in the first year of the grant and thereafter vest in equal annual installments over three years.

F3 · derivative.expiration_date: These RSUs are subject to the achievement of performance criteria determined in the first year of the grant and thereafter vest in equal annual installments over three years.

SEC source: 0001127602-17-006135 · form4.xml · nonDerivative · entry 3

Abrams John R · CIK 0001600505 · Sr. VP, Global Sales & Service

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 6,814.602

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