MONOLITHIC POWER SYSTEMS INC — Director's Dealing 2011

Nov 2, 2011

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: MONOLITHIC POWER SYSTEMS INC (MPWR)
CIK: 0001280452
Period of Report: 2011-11-02

Reporting Person: Xiao Deming (Pres. of MPS Asia Operations)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2011-11-02	Common Stock	S	1364	$11.9499	Disposed	144183	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	22140	Indirect

Footnotes

F1: Shares sold to pay tax obligations resulting from the vesting of restricted stock units.

F2: Represent shares owned by the reporting person's spouse.