MKS INC — Director's Dealing 2013

Apr 12, 2013

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: MKS INSTRUMENTS INC (MKSI)
CIK: 0001049502
Period of Report: 2013-04-11

Reporting Person: Eyerman Paul (VP & GM, ENI and Medical)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2013-04-11	Common Stock	M	2043	—	Acquired	17336.875	Direct
2013-04-11	Common Stock	F	756	$26.84	Disposed	16580.875	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2013-04-11	Restricted Stock Unit	$	M	2043	Disposed		Common Stock (2043)	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: The RSUs vest in equal annual installments over three years

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