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MONOLITHIC POWER SYSTEMS INC Director's Dealing 2010

Feb 25, 2010

30057_dirs_2010-02-25_0794526e-eda1-4ebd-b0dd-9706769bbd25.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: 2010-02-25

Reporting Person: Ueunten Paul (Sr. V.P. Design Engineering)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2010-02-25	Common Stock	A	30000	—	Acquired	87884	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	153556	Indirect
Common Stock	123900	Indirect
Common Stock	30550	Indirect
Common Stock	30550	Indirect

Footnotes

F1: Subject to accelerated vesting in certain circumstances, 25% of the Performance Units are subject to vest on the 12-month anniversary of the Vesting Commencement Date and 25% of the Performance Units are subject to vest on each of the next 3 yearly anniversaries of the Vesting Commencement Date, provided that the Grantee continues to be a Service Provider from the Grant Date through each applicable vesting date.