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Filing Details

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

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership
Common Stock	Acquisiton	2015-02-03	90,181	$0.00	246,210	No	4	A	Direct
Common Stock	Disposition	2015-02-03	1,242	$47.21	244,968	No	4	S	Direct
Common Stock	Disposition	2015-02-03	64	$47.21	244,904	No	4	S	Direct
Common Stock	Acquisiton	2015-02-03	8,071	$0.00	252,975	No	4	A	Direct
Common Stock	Disposition	2015-02-05	724	$48.02	252,251	No	4	S	Direct
Common Stock	Disposition	2015-02-05	15,222	$47.80	237,029	No	4	S	Direct
Common Stock	Disposition	2015-02-05	6,096	$47.80	230,933	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership
No	4	A	Direct
No	4	S	Direct
No	4	S	Direct
No	4	A	Direct
No	4	S	Direct
No	4	S	Direct
No	4	S	Direct

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Common Stock	2,000	Indirect	by Family Trust

Footnotes

On February 11, 2013, the reporting person was granted a target of 31,930 shares of restricted stock units subject to satisfaction of pre-determined, performance-based vesting criteria. On February 3, 2015, the Company's Board of Directors determined that those performance criteria for the restricted stock units had been satisfied, which resulted in 58,251 additional shares being achieved and granted to the reporting person. Of the restricted stock units that were awarded, 45,090 will vest immediately and 45,091 will vest quarterly in the next two years.
Shares sold to pay tax obligations resulting from the vesting of restricted stock units.
1/12 of the Restricted Stock Units shall vest quarterly following the Vesting Commencement Date, provided that the Grantee continues to be a Service Provider from the Grant Date through each applicable vesting date.