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MKS INC Director's Dealing 2011

Mar 30, 2011

30723_dirs_2011-03-30_2c697ff2-3e05-4a59-a51f-94b074f97c86.zip

Director's Dealing

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SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: MKS INSTRUMENTS INC (MKSI)
CIK: 0001049502
Period of Report: 2011-03-28

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

Non-Derivative Transactions

Date Security Code Shares Price A/D Holdings After Ownership
2011-03-28 Common Stock M 4200 Acquired 4200 Direct
2011-03-28 Common Stock F 1334 $32.32 Disposed 2866 Direct
2011-03-29 Common Stock S 2866 $31.736 Disposed 0 Direct

Derivative Transactions

Date Security Exercise Price Code Shares A/D Expiration Underlying Ownership
2011-03-28 Restricted Stock Unit $ M 4200 Disposed Common Stock (4200) 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: This transaction was executed in multiple trades at prices ranging from $31.56 to $31.96 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.

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