MONOLITHIC POWER SYSTEMS INC — Director's Dealing 2014

May 6, 2014

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: MONOLITHIC POWER SYSTEMS INC (MPWR)
CIK: 0001280452
Period of Report: 2014-05-02

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

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2014-05-02	Common Stock	S	2041.0	$36.7695	Disposed	83868	Direct
2014-05-05	Common Stock	S	265.0	$36.2501	Disposed	83603	Direct
2014-05-05	Common Stock	S	13.0	$36.25	Disposed	83590	Direct
2014-05-05	Common Stock	S	820.0	$36.2501	Disposed	82770	Direct
2014-05-06	Common Stock	S	795.0	$36.4108	Disposed	81975	Direct
2014-05-02	Common Stock	S	870.0	$36.7695	Disposed	6428	Indirect
2014-05-05	Common Stock	S	236.0	$36.2501	Disposed	6192	Indirect
2014-05-05	Common Stock	S	12.0	$36.25	Disposed	6180	Indirect

Footnotes

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