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: CHANG KUO WEI HERBERT (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	25000	Acquired	2017-02-09	Common Stock (25000)	Direct

Footnotes

F1: Per the Company's 2004 Equity Incentive Plan, each year, on the date of the first meeting of the Board or Compensation Committee, as applicable, for the fiscal year, with such grant to be effective as of the first day that the Company's trading window re-opens (or as of the date of the meeting of the Board or Compensation Committee, as applicable, if the Company's trading window is open on such date), the Company grants each non-employee director who has been on the Board for at least six months, an option to purchase 25,000 shares of Common Stock.

F2: Option is 100% exercisable on the first anniversary of the Vesting Commencement Date, provided the non-employee director remains a director on such date.