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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
1308676	Michael Hsing	79 Great Oaks Blvd San Jose CA 95119	Ceo	Yes	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	337,002	$0.00	1,477,032	No	4	A	Direct
Common Stock	Disposition	2016-02-04	88,849	$57.93	1,388,183	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	29,000	Indirect	Hsing Fam Foundation
Common Stock	133,040	Indirect	by M Hsing 04 Trust

Footnotes

On February 4, 2014, the reporting person was granted a target of 122,546 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 214,456 additional shares being achieved and granted to the reporting person. Of the restricted stock units that were awarded, 168,501 will vest immediately and 168,501 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.