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MONOLITHIC POWER SYSTEMS INC Director's Dealing 2011

Mar 9, 2011

30057_dirs_2011-03-09_00bbd1f0-1528-43dc-87c1-c0ab23eb6882.zip

Director's Dealing

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SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: MONOLITHIC POWER SYSTEMS INC (MPWR)
CIK: 0001280452
Period of Report: 2011-02-18

Reporting Person: Tseng Saria (VP & General Counsel)

Non-Derivative Transactions

Date Security Code Shares Price A/D Holdings After Ownership
2011-02-15 Common Stock J 1460 $13.1325 Acquired 85542 Direct
2011-02-18 Common Stock S 1460 $16 Disposed 84082 Direct

Footnotes

F1: Acquired through the Company's qualified ESPP program.

F2: Transaction was executed during an authorized trading window in compliance with the Company's Insider Trading Compliance Program.