MONOLITHIC POWER SYSTEMS INC — Director's Dealing 2013

Aug 6, 2013

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: MONOLITHIC POWER SYSTEMS INC (MPWR)
CIK: 0001280452
Period of Report: 2013-08-02

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

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2013-08-02	Common Stock	S	1696.0	$26.1009	Disposed	109738	Direct
2013-08-02	Common Stock	S	1511.0	$26.1009	Disposed	108227	Direct
2013-08-05	Common Stock	S	345.0	$26.03	Disposed	107882	Direct
2013-08-05	Common Stock	S	310.0	$26.03	Disposed	107572	Direct
2013-08-06	Common Stock	S	700.0	$26.2388	Disposed	106872	Direct
2013-08-06	Common Stock	S	631.0	$26.2388	Disposed	106241	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	22746	Indirect

Footnotes

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

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 $25.95 to $26.225. 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.

F3: In accordance with the reporting person's 10b5-1 trading plan.

F4: 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 $26.11 to $26.33. 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.