MKS INC — Director's Dealing 2014

Feb 12, 2014

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: MKS INSTRUMENTS INC (MKSI)
CIK: 0001049502
Period of Report: 2014-02-10

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

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2014-02-10	Restricted Stock Unit	$	A	12913.223	Acquired		Common Stock (12913.223)	Direct
2014-02-10	Restricted Stock Unit	$	A	19369.835	Acquired		Common Stock (19369.835)	Direct

Footnotes

F1: Each restricted stock unit represents the contingent right to receive one share of common stock of MKS Instruments, Inc.

F2: The RSUs vest in equal annual installments over three years.

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.