MKS INC — Director's Dealing 2016

Jan 28, 2016

SEC Form 4/A — Form 4/A

Issuer: MKS INSTRUMENTS INC (MKSI)
CIK: 0001049502
Period of Report: 2014-01-30

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

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2014-01-30	Restricted Stock Unit	$	J	884.101	Disposed		Common Stock (884.101)	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 reflects the forfeiture of RSUs due to performance criteria.

F3: On February 3, 2014, the reporting person mistakenly filed a Form 4 reporting an acquisition of restricted stock units instead of a disposition of restricted stock units.

F4: 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.