MKS INC — Director's Dealing 2015

Feb 11, 2015

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: MKS INSTRUMENTS INC (MKSI)
CIK: 0001049502
Period of Report: 2015-02-10

Reporting Person: BAGSHAW SETH H (Vice President, CFO, Treasurer)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2015-02-10	Common Stock	M	6456	—	Acquired	23187.803	Direct
2015-02-10	Common Stock	M	4304	—	Acquired	27491.803	Direct
2015-02-10	Common Stock	F	3598	$35.86	Disposed	23893.803	Direct
2015-02-10	Common Stock	S	1615	$35.78	Disposed	22278.803	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2015-02-10	Restricted Stock Unit	$	M	6456	Disposed		Common Stock (6456)	Direct
2015-02-10	Restricted Stock Unit	$	M	4304	Disposed		Common Stock (4304)	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 vests in equal annual installments over three years.

F4: The RSUs vest in equal annual installments over three years.