MONOLITHIC POWER SYSTEMS INC — Director's Dealing 2010

Apr 15, 2010

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: MONOLITHIC POWER SYSTEMS INC (MPWR)
CIK: 0001280452
Period of Report: 2010-04-14

Reporting Person: Xiao Deming (Pres. of MPS Asia Operations)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2010-04-14	Common Stock	S	8505	$24.5	Disposed	97669	Direct
2010-02-16	Common Stock	J	643	$18.411	Acquired	16253	Indirect

Footnotes

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

F2: Acquired through the Company's qualified ESPP program.