MONOLITHIC POWER SYSTEMS INC — Director's Dealing 2012

Aug 10, 2012

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: MONOLITHIC POWER SYSTEMS INC (MPWR)
CIK: 0001280452
Period of Report: 2012-08-09

Reporting Person: Rao Meera (CFO)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2012-08-09	Common Stock	S	1024.0	$20.46	Disposed	96867.0	Direct
2012-08-09	Common Stock	M	1500.0	$13.53	Acquired	98367.0	Direct
2012-08-09	Common Stock	S	1500.0	$21.0	Disposed	96867.0	Direct
2012-08-10	Common Stock	S	702.0	$20.7343	Disposed	96165.0	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2012-08-09	Non-Qualified Stock Option (right to buy)	$13.53	M	1500.0	Disposed	2016-01-05	Common Stock (1500.0)	Direct

Footnotes

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

F2: In accordance with the reporting person's 10b5-1 trading plan.