MONOLITHIC POWER SYSTEMS INC — Director's Dealing 2010

Feb 9, 2010

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: MONOLITHIC POWER SYSTEMS INC (MPWR)
CIK: 0001280452
Period of Report: 2010-02-09

Reporting Person: Zhou Jeff (Director)

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2010-02-09	Non-Qualified Stock Option (right to buy)	$20.2	A	40000	Acquired	2017-02-09	Common Stock (40000)	Direct

Footnotes

F1: Per the 2004 Equity Incentive Plan, each new Outside Director will automatically be granted an Option to purchase 40,000 Shares on or about the date on which such peron first becomes an Outside Director.

F2: 50% of the shares subject to vest on each anniversary of the Vesting Commencement Date, provided that the Participant continues to serve as a Director on such dates.