MONOLITHIC POWER SYSTEMS INC — Director's Dealing 2012

Aug 23, 2012

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: MONOLITHIC POWER SYSTEMS INC (MPWR)
CIK: 0001280452
Period of Report: 2012-08-21

Reporting Person: CHANG KUO WEI HERBERT (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2012-08-21	Common Stock	M	11000.0	$7.51	Acquired	102035.0	Direct
2012-08-21	Common Stock	S	11000.0	$22.1551	Disposed	91035.0	Direct
2012-08-22	Common Stock	M	4000.0	$7.51	Acquired	95035.0	Direct
2012-08-22	Common Stock	S	4000.0	$21.9305	Disposed	91035.0	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2012-08-21	Non-Qualified Stock Option (right to buy)	$7.51	M	11000.0	Disposed	2015-06-02	Common Stock (11000.0)	Direct
2012-08-22	Non-Qualified Stock Option (right to buy)	$7.51	M	4000.0	Disposed	2015-06-02	Common Stock (4000.0)	Direct

Footnotes

F1: 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 $22.00025 to $22.25. 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.

F2: 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 $21.86 to $22.00. 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.