MONOLITHIC POWER SYSTEMS INC — Director's Dealing 2014

Nov 6, 2014

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: MONOLITHIC POWER SYSTEMS INC (MPWR)
CIK: 0001280452
Period of Report: 2014-08-22

Reporting Person: Hsing Michael (Director, CEO)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2014-08-22	Common Stock	S	40000.0	$46.3724	Disposed	267860	Direct
2014-08-25	Common Stock	S	55326.0	$45.9589	Disposed	212534	Direct
2014-08-26	Common Stock	S	54540.0	$46.4187	Disposed	157994	Direct
2014-11-05	Common Stock	S	2679.0	$43.81	Disposed	155315	Direct
2014-11-06	Common Stock	S	2060.0	$44.26	Disposed	153255	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	465566	Indirect
Common Stock	133040	Indirect
Common Stock	29000	Indirect
Common Stock	133040	Indirect

Footnotes

F1: Transaction was executed during an authorized trading window in compliance with the Company's Insider Trading Compliance Program.

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 $46.32 to $46.545. 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 reported transaction is being amended to correct the beneficial ownership from Indirect to Direct.

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 $45.705819 to $46.15. 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.

F5: 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 $46.25 to $46.6. 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.

F6: Shares sold to pay tax obligations resulting from the vesting of restricted stock units.