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MKS INC Director's Dealing 2018

May 2, 2018

30723_dirs_2018-05-02_17ee1b2d-6abf-4ed3-ae04-ed8fa14af626.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: 2018-05-01

Reporting Person: COLELLA GERARD G (Director, CEO, President, Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2018-05-01	Common Stock	S	10000	$101.92	Disposed	36296	Indirect

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	42293.742	Direct

Footnotes

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

F2: This transaction was executed in multiple trades at prices ranging from $101.10 to $102.45. 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.