MONOLITHIC POWER SYSTEMS INC — Director's Dealing 2013

Mar 18, 2013

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: MONOLITHIC POWER SYSTEMS INC (MPWR)
CIK: 0001280452
Period of Report: 2013-03-14

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

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2013-03-14	Common Stock	S	143.0	$24.56	Disposed	12679	Indirect
2013-03-14	Common Stock	A	17.0	$0.0	Acquired	12696	Indirect
2013-03-14	Common Stock	S	8.0	$24.56	Disposed	12688	Indirect

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	155392	Direct

Footnotes

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

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.