MONOLITHIC POWER SYSTEMS INC — Director's Dealing 2013

May 30, 2013

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: MONOLITHIC POWER SYSTEMS INC (MPWR)
CIK: 0001280452
Period of Report: 2013-05-28

Reporting Person: Hsing Michael (Director, CEO)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2013-05-28	Common Stock	S	4000.0	$24.5627	Disposed	29000	Indirect

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	585123	Direct
Common Stock	465566	Indirect
Common Stock	133040	Indirect
Common Stock	133040	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 $24.478 to $24.61. 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.