MKS INC — Director's Dealing 2013

May 8, 2013

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: MKS INSTRUMENTS INC (MKSI)
CIK: 0001049502
Period of Report: 2013-05-06

Reporting Person: Beecher Gregory R (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2013-05-06	Common Stock	A	4418.262	—	Acquired	28818.262	Direct

Footnotes

F1: This RSU grant fully vests on the day prior to the first annual meeting of shareholders following the date of grant (or if no such meeting is held within 13 months after the date of grant, on the 13 month anniversary of the date of grant).

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