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: Xiao Deming (Pres. of MPS Asia Operations)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2013-08-02	Common Stock	S	2035.0	$26.2097	Disposed	82136	Direct
2013-08-05	Common Stock	S	277.0	$26.0305	Disposed	81859	Direct
2013-08-06	Common Stock	S	794.0	$26.2004	Disposed	81065	Direct
2013-08-06	Common Stock	S	248.0	$26.2006	Disposed	11785	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 $26.2097 to $26.21. 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: 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 $26.0300 to $26.0305. 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.

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 $26.20 to $26.2006. 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.