MONOLITHIC POWER SYSTEMS INC — Director's Dealing 2013

Jul 15, 2013

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: MONOLITHIC POWER SYSTEMS INC (MPWR)
CIK: 0001280452
Period of Report: 2013-07-12

Reporting Person: Tseng Saria (VP & General Counsel)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2013-07-12	Common Stock	M	563.0	$7.64	Acquired	75563	Direct
2013-07-12	Common Stock	M	884.0	$15.28	Acquired	76447	Direct
2013-07-12	Common Stock	M	3750.0	$12.42	Acquired	80197	Direct
2013-07-12	Common Stock	M	329.0	$14.93	Acquired	80526	Direct
2013-07-12	Common Stock	M	941.0	$12.42	Acquired	81467	Direct
2013-07-12	Common Stock	S	13467.0	$25.2237	Disposed	68000	Direct
2013-07-12	Common Stock	M	7000.0	$14.93	Acquired	75000	Direct
2013-07-15	Common Stock	S	490.0	$25.8	Disposed	74510	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2013-07-12	Non-Qualified Stock Option (right to buy)	$7.64	M	563.0	Disposed	2014-11-17	Common Stock (563)	Direct
2013-07-12	Non-Qualified Stock Option (right to buy)	$12.42	M	941.0	Disposed	2015-10-22	Common Stock (941)	Direct
2013-07-12	Non-Qualified Stock Option (right to buy)	$13.01	M	3750.0	Disposed	2015-10-22	Common Stock (3750)	Direct
2013-07-12	Non-Qualified Stock Option (right to buy)	$14.93	M	329.0	Disposed	2015-01-31	Common Stock (329)	Direct
2013-07-12	Non-Qualified Stock Option (right to buy)	$15.28	M	884.0	Disposed	2014-07-27	Common Stock (884)	Direct
2013-07-12	Non-Qualified Stock Option (right to buy)	$15.64	M	7000.0	Disposed	2015-01-31	Common Stock (7000)	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	2000	Indirect

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.

F3: The price is the weighted average sale price for the transactions reported on this line. The prices for the transactions reported on this line range from $25.16 to $25.2237. The reporting person undertakes to provide, upon request by the staff of the Securities and Exchange Commission, the issuer, or a security holder of the issuer, full information regarding the number of shares sold at each separate price.