MONOLITHIC POWER SYSTEMS INC — Director's Dealing 2010

Feb 26, 2010

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: Moyer James C (Director, Chief IC Design Engineer)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2010-02-25	Common Stock	A	6000	—	Acquired	896569	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	489143	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.