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MKS INC Director's Dealing 2017

May 12, 2017

30723_dirs_2017-05-12_c6ae78b7-bd89-4738-995e-6fb0094563b6.zip

Director's Dealing

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SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: MKS INSTRUMENTS INC (MKSI)
CIK: 0001049502
Period of Report: 2017-05-11

Reporting Person: Quirk Brian Charles (Sr. VP, Global Operations)

Non-Derivative Transactions

Date Security Code Shares Price A/D Holdings After Ownership
2017-05-11 Common Stock M 3557.874 Acquired 19120.819 Direct
2017-05-11 Common Stock F 1565 $80.50 Disposed 17555.819 Direct

Derivative Transactions

Date Security Exercise Price Code Shares A/D Expiration Underlying Ownership
2017-05-11 Restricted Stock Unit $ M 3557.874 Disposed Common Stock (3557.874) Direct

Footnotes

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

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

F3: 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.