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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
1308647	Deming Xiao	79 Great Oaks Blvd San Jose CA 95119	Pres. Of Mps Asia Operations	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	Disposition	2016-01-05	97	$60.93	608	No	4	S	Indirect	by Spouse

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	S	Indirect	by Spouse

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Performance Shares	Acquisiton	2015-12-31	75,678	$0.00	75,678	$0.00

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
75,678			No	4	A	Direct

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Common Stock	259,324	Direct

Footnotes

Shares sold to pay tax obligations resulting from the vesting of restricted stock units.
On December 31, 2015, the reporting person was granted a target of 75,678 shares of restricted stock units in four tranches over the next four years subject to satisfaction of share price targets. The vesting of restricted stock units in the second, third and fourth tranches is also subject to satisfaction of certain operational goals and market price hurdles as well as time vesting condition, as determined by the Compensation Committee of the Company. One-third of the shares have no sales restrictions and are sellable upon vesting on January 1, 2020, one-third of the shares have no sales restrictions until January 1, 2021 and one-third of the shares have no sales restrictions until January 1, 2022 subsequent to the achievement of those price and operational targets.