MKS INC — Director's Dealing 2016

Feb 12, 2016

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: MKS INSTRUMENTS INC (MKSI)
CIK: 0001049502
Period of Report: 2016-02-10

Reporting Person: Lee John Tseng-Chung (Sr. VP, Business Units)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2016-02-10	Common Stock	M	4304	—	Acquired	4980.287	Direct
2016-02-10	Common Stock	M	2870	—	Acquired	7850.287	Direct
2016-02-10	Common Stock	F	2416	$32.70	Disposed	5434.287	Direct
2016-02-11	Common Stock	S	861	$31.96	Disposed	4573.287	Direct
2016-02-11	Common Stock	S	574	$31.96	Disposed	3999.287	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2016-02-10	Restricted Stock Unit	$	M	4304	Disposed		Common Stock (4304)	Direct
2016-02-10	Restricted Stock Unit	$	M	2870	Disposed		Common Stock (2870)	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 are subject to the achievement of performance criteria determined in the first year of the grant and thereafter vest in equal annual installments over three years.

F4: The RSUs vest in equal annual installments over three years from the respective original grant date.