MKS INC — Director's Dealing 2010

Dec 2, 2010

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: MKS INSTRUMENTS INC (MKSI)
CIK: 0001049502
Period of Report: 2010-11-30

Reporting Person: BAGSHAW SETH H (Vice President, CFO)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2010-11-30	Common Stock	A	656	$16.19	Acquired	656	Direct

Footnotes

F1: These shares were acquired under the MKS employee stock purchase plan.