MKS INC — Director's Dealing 2016

Nov 21, 2016

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: MKS INSTRUMENTS INC (MKSI)
CIK: 0001049502
Period of Report: 2016-11-17

Reporting Person: Werth Dennis L (Sr. VP, Business Units)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2016-11-17	Common Stock	D	2100	$56.50	Disposed	3738	Direct
2016-11-17	Common Stock	F	1405	$56.50	Disposed	2333	Direct
2016-11-17	Common Stock	S	2333	$56.41	Disposed	0	Direct
2016-11-17	Common Stock	M	5838	$20.32	Acquired	5838	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2016-11-17	Stock Appreciation Right	$20.32	M	5838	Disposed	2017-03-31	Common Stock (5838)	Direct

Footnotes

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

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

F3: The stock appreciation right became fully vested on March 31, 2013.