MONOLITHIC POWER SYSTEMS INC — Director's Dealing 2010

Jan 12, 2010

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: MONOLITHIC POWER SYSTEMS INC (MPWR)
CIK: 0001280452
Period of Report: 2010-01-12

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

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2010-01-12	Common Stock	S	100	$22.26	Disposed	489243	Indirect
2010-01-12	Common Stock	S	100	$22.3	Disposed	489143	Indirect

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	890569	Direct

Footnotes

F1: In accordance with the reporting person's 10b5-1 trading plan.