MKS INC — Director's Dealing 2013

Oct 21, 2013

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: MKS INSTRUMENTS INC (MKSI)
CIK: 0001049502
Period of Report: 2013-10-18

Reporting Person: BERLINGHIERI LEO (Director, CEO)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2013-10-18	Common Stock	M	31800	$27.11	Acquired	145905.607	Direct
2013-10-18	Common Stock	S	31800	$29.024	Disposed	114105.607	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2013-10-18	Stock Option (Right to Buy)	$27.11	M	31800	Disposed	2013-11-11	Common Stock (31800)	Direct

Footnotes

F1: This transaction was effected pursuant to a Rule 10b5-1 trading plan previously adopted by the reporting person.

F2: This transaction was executed in multiple trades at prices ranging from $29.00 to $29.06 The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide, upon request, the full information regarding the number of shares and prices at which the transaction was effected.