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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
1312593	Saria Tseng	79 Great Oaks Blvd San Jose CA 95119	Vp & General Counsel	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	Explanation
Common Stock	Acquisiton	2016-02-02	90,284	$0.00	348,079	No	4	A	Direct
Common Stock	Disposition	2016-02-04	22,057	$57.93	326,022	No	4	S	Direct

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

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Common Stock	2,000	Indirect	S. Tseng Charity Fund

Footnotes

On February 4, 2014, the reporting person was granted a target of 32,831 shares of restricted stock units subject to satisfaction of pre-determined, performance-based vesting criteria. On February 2, 2016, the Company's Board of Directors determined that those performance criteria for the restricted stock units had been satisfied, which resulted in 57,453 additional shares being achieved and granted to the reporting person. Of the restricted stock units that were awarded, 45,143 will vest immediately and 45,141 will vest quarterly in the next two years.
The reported sales were to cover taxes upon the vesting of restricted stock units, as required by the Company's equity incentive plans.