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Filing Details

Accession Number:: 0001280452-13-000048
Form Type:: 4
Zero Holdings:: No
Publication Time:: 2013-02-08 20:45:55
Reporting Period:: 2013-02-06

Filing Date:: 2013-02-08
Accepted Time:: 2013-02-08 20:45:55
SEC Url:: Form 4 Filing

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1280452	Monolithic Power Systems Inc	MPWR	Semiconductors & Related Devices (3674)	770466789

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1360833	Maurice Sciammas	79 Great Oaks Blvd San Jose CA 95119	Sr. V.p.of Sales And Marketing	No	Yes	No	No

Reported Non-Derivative Transactions

Show Other Fields >>

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock	Disposition	2013-02-06	3,534	$22.89	105,476	No	4	S	Direct
Common Stock	Acquisiton	2013-02-06	615	$0.00	106,091	No	4	A	Direct
Common Stock	Disposition	2013-02-07	241	$22.70	105,850	No	4	S	Direct
Common Stock	Disposition	2013-02-07	12,240	$25.00	51,764	No	4	S	Indirect	by Family Trust
Common Stock	Disposition	2013-02-08	7,760	$25.00	44,004	No	4	S	Indirect	by Family Trust

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	S	Direct
No	4	A	Direct
No	4	S	Direct
No	4	S	Indirect	by Family Trust
No	4	S	Indirect	by Family Trust

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Common Stock	14,371	Indirect	byC Sciammas 04 TRST
Common Stock	14,371	Indirect	byM Sciammas 04 Trst

Footnotes

50% of the Performance Units are subject to vest on the first anniversay of the Grant Date and 50% of the Performance Units are subject to vest on the second anniversary of the Grant Date, provided that the Grantee continues to be a service provider on such dates.
Shares sold to pay tax obligations resulting from the vesting of performance units (restricted stock units) originally granted on February 25, 2010. The Performance was met and the shares were released per board approval on February 5, 2013.
Equitable stock dividend adjustment approved by the Board of Director as a result of dividend Payment to shareholders on December 28, 2012. Stock dividends will release according to the same vesting schedule as the original grants.
Shares sold to pay tax obligations resulting from the release of restricted stock units.
In accordance with the reporting person's 10b5-1 trading plan.
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 $25.00 to $25.06. 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.
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 $25.00 to $25.01. 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.