MONOLITHIC POWER SYSTEMS INC — Director's Dealing 2012

Aug 10, 2012

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: MONOLITHIC POWER SYSTEMS INC (MPWR)
CIK: 0001280452
Period of Report: 2012-08-09

Reporting Person: Moyer James C (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2012-08-10	Common Stock	S	161.0	$20.7356	Disposed	1006990.0	Direct
2012-08-09	Common Stock	S	600.0	$20.5583	Disposed	473683.0	Indirect
2012-08-10	Common Stock	S	600.0	$20.7477	Disposed	473083.0	Indirect

Footnotes

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

F2: In accordance with the reporting person's 10b5-1 trading plan.

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 $20.50 to $20.64. 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 $20.72 to $20.773. 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.