MONOLITHIC POWER SYSTEMS INC — Director's Dealing 2013

Feb 8, 2013

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: MONOLITHIC POWER SYSTEMS INC (MPWR)
CIK: 0001280452
Period of Report: 2013-02-06

Reporting Person: Tseng Saria (VP & General Counsel)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2013-02-06	Common Stock	S	3530.0	$22.8888	Disposed	73906.0	Direct
2013-02-06	Common Stock	A	597.0	$0.0	Acquired	74503.0	Direct
2013-02-07	Common Stock	S	239.0	$23.7	Disposed	74264.0	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	3000.0	Indirect

Footnotes

F1: Shares sold to pay tax obligations resulting from the vesting of performance units (restricted stock units) originally granted on February 25, 2010. The Performance was met and the shares were released per board approval on February 5, 2013.

F2: Equitable stock dividend adjustment approved by the Board of Director as a result of dividend Payment to shareholders on December 28, 2012. Stock dividends will release according to the same vesting schedule as the original grants.

F3: Shares sold to pay tax obligations resulting from the release of restricted stock units.