MKSI

SEC source: 0001127602-17-034964 · form4.xml · nonDerivative · entry 4

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

F2 · kind: Shares have been withheld in satisfaction of reporting person's tax withholding obligations resulting from the exercise of stock appreciation rights.

SEC source: 0001127602-17-034964 · form4.xml · nonDerivative · entry 3

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,362

F1 · kind: Reflects the disposition of shares to the issuer deemed to occur upon the exercise of a stock appreciation right.

SEC source: 0001127602-17-034964 · form4.xml · nonDerivative · entry 2

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 2,582

SEC source: 0001127602-17-034964 · form4.xml · nonDerivative · entry 1

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 4,199

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001127602-17-034012 · form4.xml · nonDerivative · entry 1

HANLEY PETER · CIK 0001185717 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 2,872.102

F1 · price: This transaction was executed in multiple trades at prices ranging from $92.575 to $92.577. 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: 0001127602-17-033752 · form4.xml · nonDerivative · entry 1

Mora Elizabeth · CIK 0001548935 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 15,854.102

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

SEC source: 0001127602-17-031987 · form4.xml · nonDerivative · entry 1

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0.772

F1 · price: This transaction was executed in multiple trades at prices ranging from $103.75 to $104.05. 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: 0001127602-17-031440 · form4.xml · nonDerivative · entry 1

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 13,784.964

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

SEC source: 0001127602-17-027427 · form4.xml · nonDerivative · entry 1

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 21,614.529

F1 · price: This transaction was executed in multiple trades at prices ranging from $85.78 to $85.90. 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: 0001127602-17-027128 · form4.xml · nonDerivative · entry 1

HANLEY PETER · CIK 0001185717 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,072.102

SEC source: 0001127602-17-026885 · form4.xml · nonDerivative · entry 1

Mora Elizabeth · CIK 0001548935 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 16,154.102

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

SEC source: 0001127602-17-025318 · form4.xml · nonDerivative · entry 1

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 15,784.964

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

SEC source: 0001127602-17-024358 · form4.xml · nonDerivative · entry 1

HANLEY PETER · CIK 0001185717 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,372.102

SEC source: 0001127602-17-021578 · form4.xml · nonDerivative · entry 1

HANLEY PETER · CIK 0001185717 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 4,372.102

SEC source: 0001127602-17-021690 · form4.xml · nonDerivative · entry 1

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

10b5-1 filing: Not disclosed

Ownership: Indirect · By The Werth Family Trust

Disclosed balance after: 7,995.437

F1 · kind: In lieu of filing a Form 5, Reporting Person is reporting this small acquisition under Rule 16a-6 on Form 4.

SEC source: 0001127602-17-020200 · form4.xml · nonDerivative · entry 1

Mora Elizabeth · CIK 0001548935 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 16,454.102

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

SEC source: 0001127602-17-019143 · form4.xml · nonDerivative · entry 1

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

10b5-1 filing: Not disclosed

Ownership: Indirect · by Gerald G. Colella Living Trust

Disclosed balance after: 61,296

F1 · price: This transaction was executed in multiple trades at prices ranging from $79.25 to $79.40. 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: 0001127602-17-018330 · form4.xml · nonDerivative · entry 1

HANLEY PETER · CIK 0001185717 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 4,622.102

F1 · price: This transaction was executed in multiple trades at prices ranging from $81.473 to $81.550. 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: 0001127602-17-017940 · form4.xml · derivative · entry 3

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 13,609.989

Underlying: Common Stock · 2,964.895 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 originally were scheduled to vest in two equal installments based on the Company's achievement of certain performance criteria for the period ending June 30, 2017 and June 30, 2018. On May 10, 2017, the Compensation Committee accelerated in full the vesting of these RSUs to May 11, 2017 as a result of the Company's 100% achievement of the performance criteria.

F3 · derivative.expiration_date: These RSUs originally were scheduled to vest in two equal installments based on the Company's achievement of certain performance criteria for the period ending June 30, 2017 and June 30, 2018. On May 10, 2017, the Compensation Committee accelerated in full the vesting of these RSUs to May 11, 2017 as a result of the Company's 100% achievement of the performance criteria.

SEC source: 0001127602-17-017940 · form4.xml · nonDerivative · entry 2

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 2,002.132

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

SEC source: 0001127602-17-017940 · form4.xml · nonDerivative · entry 1

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 2,965.132

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: 0001127602-17-017929 · form4.xml · derivative · entry 3

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 13,330.302

Underlying: Common Stock · 3,557.874 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 originally were scheduled to vest in two equal installments based on the Company's achievement of certain performance criteria for the period ending June 30, 2017 and June 30, 2018. On May 10, 2017, the Compensation Committee accelerated in full the vesting of these RSUs to May 11, 2017 as a result of the Company's 100% achievement of the performance criteria.

F3 · derivative.expiration_date: These RSUs originally were scheduled to vest in two equal installments based on the Company's achievement of certain performance criteria for the period ending June 30, 2017 and June 30, 2018. On May 10, 2017, the Compensation Committee accelerated in full the vesting of these RSUs to May 11, 2017 as a result of the Company's 100% achievement of the performance criteria.

SEC source: 0001127602-17-017929 · form4.xml · nonDerivative · entry 2

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 17,555.819

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

SEC source: 0001127602-17-017929 · form4.xml · nonDerivative · entry 1

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 19,120.819

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: 0001127602-17-017922 · form4.xml · derivative · entry 3

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 25,294.433

Underlying: Common Stock · 3,557.874 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 originally were scheduled to vest in two equal installments based on the Company's achievement of certain performance criteria for the period ending June 30, 2017 and June 30, 2018. On May 10, 2017, the Compensation Committee accelerated in full the vesting of these RSUs to May 11, 2017 as a result of the Company's 100% achievement of the performance criteria.

F3 · derivative.expiration_date: These RSUs originally were scheduled to vest in two equal installments based on the Company's achievement of certain performance criteria for the period ending June 30, 2017 and June 30, 2018. On May 10, 2017, the Compensation Committee accelerated in full the vesting of these RSUs to May 11, 2017 as a result of the Company's 100% achievement of the performance criteria.

SEC source: 0001127602-17-017922 · form4.xml · nonDerivative · entry 2

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,884.627

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

SEC source: 0001127602-17-017922 · form4.xml · nonDerivative · entry 1

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,558.627

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: 0001127602-17-017912 · form4.xml · derivative · entry 4

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 76,754.821

Underlying: Common Stock · 9,487.666 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 originally were scheduled to vest in two equal installments based on the Company's achievement of certain performance criteria for the period ending June 30, 2017 and June 30, 2018. On May 10, 2017, the Compensation Committee accelerated in full the vesting of these RSUs to May 11, 2017 as a result of the Company's 100% achievement of the performance criteria.

F3 · derivative.expiration_date: These RSUs originally were scheduled to vest in two equal installments based on the Company's achievement of certain performance criteria for the period ending June 30, 2017 and June 30, 2018. On May 10, 2017, the Compensation Committee accelerated in full the vesting of these RSUs to May 11, 2017 as a result of the Company's 100% achievement of the performance criteria.

SEC source: 0001127602-17-017912 · form4.xml · nonDerivative · entry 2

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 5,024.65

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

SEC source: 0001127602-17-017912 · form4.xml · nonDerivative · entry 1

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 9,488.65

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: 0001127602-17-017917 · form4.xml · derivative · entry 3

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 32,355.59

Underlying: Common Stock · 5,929.791 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 originally were scheduled to vest in two equal installments based on the Company's achievement of certain performance criteria for the period ending June 30, 2017 and June 30, 2018. On May 10, 2017, the Compensation Committee accelerated in full the vesting of these RSUs to May 11, 2017 as a result of the Company's 100% achievement of the performance criteria.

F3 · derivative.expiration_date: These RSUs originally were scheduled to vest in two equal installments based on the Company's achievement of certain performance criteria for the period ending June 30, 2017 and June 30, 2018. On May 10, 2017, the Compensation Committee accelerated in full the vesting of these RSUs to May 11, 2017 as a result of the Company's 100% achievement of the performance criteria.

SEC source: 0001127602-17-017917 · form4.xml · nonDerivative · entry 2

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 28,885.384

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

SEC source: 0001127602-17-017917 · form4.xml · nonDerivative · entry 1

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 31,675.384

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: 0001127602-17-017817 · form4.xml · nonDerivative · entry 1

HANLEY PETER · CIK 0001185717 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 5,822.102

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: 0001127602-17-017825 · form4.xml · nonDerivative · entry 1

PHILLIPPY ROBERT J · CIK 0001213190 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 5,276.74

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: 0001127602-17-017823 · form4.xml · nonDerivative · entry 1

Mora Elizabeth · CIK 0001548935 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 16,754.102

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: 0001127602-17-017821 · form4.xml · nonDerivative · entry 1

Moloney Jacqueline F · CIK 0001501968 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 5,821.278

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: 0001127602-17-017819 · form4.xml · nonDerivative · entry 1

Hess Rick D · CIK 0001331476 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,988.812

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: 0001127602-17-017815 · form4.xml · nonDerivative · entry 2

CHUTE RICHARD S · CIK 0001202741 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 8,604.102

SEC source: 0001127602-17-017815 · form4.xml · nonDerivative · entry 1

CHUTE RICHARD S · CIK 0001202741 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 11,604.102

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: 0001127602-17-017813 · form4.xml · nonDerivative · entry 1

Beecher Gregory R · CIK 0001239380 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 20,644.102

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: 0001127602-17-017810 · form4.xml · nonDerivative · entry 1

BERTUCCI JOHN R · CIK 0001106180 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 77,522.102

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: 0001127602-17-017808 · form4.xml · nonDerivative · entry 1

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 15,562.945

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

SEC source: 0001127602-17-018597 · form4.xml · nonDerivative · entry 1

ANDERSON ROBERT R · CIK 0001202728 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · By Trust

Disclosed balance after: 9,295.824

SEC source: 0001127602-17-017114 · form4.xml · nonDerivative · entry 1

Beecher Gregory R · CIK 0001239380 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 18,655.29

F1 · price: This transaction was executed in multiple trades at prices ranging from $80.85 to $80.88. 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: 0001127602-17-016813 · form4.xml · nonDerivative · entry 1

Mora Elizabeth · CIK 0001548935 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 14,765.29

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

SEC source: 0001127602-17-016277 · form4.xml · nonDerivative · entry 1

Beecher Gregory R · CIK 0001239380 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 22,615.29

F1 · price: This transaction was executed in multiple trades at prices ranging from $78.50 to $79.00. 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: 0001127602-17-013872 · form4.xml · nonDerivative · entry 1

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 17,562.945

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

SEC source: 0001127602-17-013852 · form4.xml · nonDerivative · entry 1

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 63,796.984

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

F2 · price: This transaction was executed in multiple trades at prices ranging from $67.65 to $69.20. 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: 0001127602-17-013545 · form4.xml · derivative · entry 5

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 25,872.275

Underlying: Common Stock · 2,455 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 vested on March 31, 2017.

F3 · derivative.expiration_date: These RSUs vested on March 31, 2017.