MONOLITHIC POWER SYSTEMS INC — Director's Dealing 2010

Jul 8, 2010

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: MONOLITHIC POWER SYSTEMS INC (MPWR)
CIK: 0001280452
Period of Report: 2010-07-08

Reporting Person: Neely Rick (Sr. VP and CFO)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2010-07-08	Common Stock	M	1700	$11.85	Acquired	33575	Direct
2010-07-08	Common Stock	S	300	$18.5	Disposed	33275	Direct
2010-07-08	Common Stock	S	1300	$18.51	Disposed	31975	Direct
2010-07-08	Common Stock	S	100	$18.52	Disposed	31875	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2010-07-08	Non-Qualified Stock Option (right to buy)	$11.85	M	1700	Disposed	2013-10-26	Common Stock (1700)	Direct

Footnotes

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