MONOLITHIC POWER SYSTEMS INC — Director's Dealing 2011

May 4, 2011

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: MONOLITHIC POWER SYSTEMS INC (MPWR)
CIK: 0001280452
Period of Report: 2011-05-03

Reporting Person: Zhou Jeff (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2011-05-03	Common Stock	A	500	—	Acquired	5700	Direct

Footnotes

F1: Restricted Stock Units were awarded in connection with the reporting person's appointment as the chairperson of the Compensation Committee and member of the Audit Committee. 100% of the restricted stock units shall vest on the first anniversary of the Vesting Commencement Date, provided the non-employee director remains a director on such date.