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MKS INC Director's Dealing 2019

May 9, 2019

30723_dirs_2019-05-09_025f7a8f-8d05-4a1c-981b-9be2acc1d5fa.zip

Director's Dealing

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SEC Form 3 — Initial Statement of Beneficial Ownership

Issuer: MKS INSTRUMENTS INC (MKSI)
CIK: 0001049502
Period of Report: 2019-05-08

Reporting Person: Burke Kathleen Flaherty (Sr. VP, GC & Secretary)

Holdings (Non-Derivative)

Security Shares Ownership
Common Stock 38986.962 Direct

Holdings (Derivative)

Security Exercise Price Expiration Underlying Shares Ownership
Restricted Stock Unit $ Common Stock (2858.054) Direct
Restricted Stock Unit $ Common Stock (4242.637) Direct
Restricted Stock Unit $ Common Stock (4722.55) Direct

Footnotes

F1: These restricted stock units (RSUs) vest on February 18, 2020.

F2: Each RSU represents the contingent right to receive one share of common stock of MKS Instruments, Inc.

F3: These RSUs will vest in two equal annual installments commencing on February 15, 2020, provided that if, in any vesting year, February 15th is not a business day, such vesting shall occur on the next business day.

F4: These RSUs vest in three equal annual installments commencing on February 15, 2020, provided that if, in any vesting year, February 15th is not a business day, such vesting shall occur on the next business day.