MONOLITHIC POWER SYSTEMS INC — Director's Dealing 2015

Feb 9, 2015

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: MONOLITHIC POWER SYSTEMS INC (MPWR)
CIK: 0001280452
Period of Report: 2015-02-05

Reporting Person: Sciammas Maurice (Sr. V.P.of Sales and Marketing)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2015-02-05	Common Stock	M	1103.0	$14.89	Acquired	232036	Direct
2015-02-06	Common Stock	S	699.0	$47.39	Disposed	231337	Direct
2015-02-09	Common Stock	S	1466.0	$47.5573	Disposed	229871	Direct
2015-02-09	Common Stock	S	69.0	$47.56	Disposed	229802	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2015-02-05	Non-Qualified Stock Option (right to buy)	$14.89	M	1103.0	Disposed	2015-02-08	Common Stock (1103)	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	2000	Indirect

Footnotes

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

F2: Represents vested shares acquired through the cash exercise of a stock option in compliance with the Company's Insider Trading Compliance Program.