MKS INC — Director's Dealing 2014

Mar 6, 2014

SEC Form 3 — Initial Statement of Beneficial Ownership

Issuer: MKS INSTRUMENTS INC (MKSI)
CIK: 0001049502
Period of Report: 2014-03-01

Reporting Person: Quirk Brian Charles (Sr. VP, Global Operations)

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	3152.635	Direct

Holdings (Derivative)

Security	Exercise Price	Expiration	Underlying	Shares	Ownership
Restricted Stock Unit	$		Common Stock (17040.25)		Direct
Restricted Stock Unit	$		Common Stock (14428.831)		Direct

Footnotes

F1: The RSUs vest in equal annual installments over three years from the respective original grant date. The amount above comprises of: 2,113.136 which was granted on April 11, 2011; 4,938.407 which was granted on April 2, 2012; 3,962.536 which was granted on February 25, 2013; and 6,026.171 on February 10, 2014.

F2: Each restricted stock unit represents the contingent right to receive one share of common stock of MKS Instruments, Inc.

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 of over three years from the respective original grant date. The amount above comprises of 5,389.575 which was granted on on February 25, 2013 and 9,039.256 on February 10, 2014.