MONOLITHIC POWER SYSTEMS INC — Director's Dealing 2013

Oct 29, 2013

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: MONOLITHIC POWER SYSTEMS INC (MPWR)
CIK: 0001280452
Period of Report: 2013-10-25

Reporting Person: SMITH- PILKINGTON KAREN A (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2013-10-25	Common Stock	M	25000.0	$19.29	Acquired	39789	Direct
2013-10-25	Common Stock	S	25000.0	$31.75	Disposed	14789	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2013-10-25	Non-Qualified Stock Option (right to buy)	$20.2	M	25000.0	Disposed	2017-02-09	Common Stock (25000)	Direct

Footnotes

F1: In accordance with the reporting person's 10b5-1 trading plan.

F2: On December 11, 2012, the Company's Board declared a special cash dividend of $1.00 per common share, which was paid on December 28, 2012 to all shareholders of record as of the close of business on December 21, 2012. The Board approved a modification whereby each outstanding option as of December 28, 2012 was increased by a ratio of 1.0471 with a corresponding reduction in the exercise price.