MONOLITHIC POWER SYSTEMS INC — Director's Dealing 2011

Feb 23, 2011

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: MONOLITHIC POWER SYSTEMS INC (MPWR)
CIK: 0001280452
Period of Report: 2011-02-22

Reporting Person: Ueunten Paul (Sr. V.P. Design Engineering)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2011-02-22	Common Stock	S	10000	$15.7286	Disposed	113900	Indirect

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	125590	Direct
Common Stock	153556	Indirect
Common Stock	26000	Indirect
Common Stock	26000	Indirect

Footnotes

F1: The price is the weighted average sale price for the transactions reported on this line. The prices for the transactions reported on this line range from $15.715 to $15.76. The reporting person undertakes to provide, upon request by the staff of the Securities and Exchange Commission, the issuer, or a security holder of the issuer, full information regarding the number of shares sold at each separate price.