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: 2014-05-05

Reporting Person: Hsing Michael (Director, CEO)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2014-05-05	Common Stock	S	826.0	$36.2502	Disposed	327384	Direct
2014-05-05	Common Stock	S	40.0	$36.25	Disposed	327344	Direct
2014-05-05	Common Stock	S	2699.0	$36.2501	Disposed	324645	Direct
2014-05-06	Common Stock	S	2067.0	$36.4107	Disposed	322578	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	465566	Indirect
Common Stock	133040	Indirect
Common Stock	29000	Indirect
Common Stock	133040	Indirect

Footnotes

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