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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	Acquisiton	2015-02-03	43,200	$0.00	285,512	No	4	M	Direct
Common Stock	Acquisiton	2015-02-17	474	$37.45	258,375	No	4	J	Direct
Common Stock	Acquisiton	2015-02-03	569	$0.00	2,148	No	4	A	Indirect	by Spouse
Common Stock	Disposition	2015-03-16	9	$53.16	2,139	No	4	S	Indirect	by Spouse
Common Stock	Disposition	2015-03-16	166	$53.16	1,973	No	4	S	Indirect	by Spouse
Common Stock	Disposition	2015-03-16	84	$53.16	1,889	No	4	S	Indirect	by Spouse

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	M	Direct
No	4	J	Direct
No	4	A	Indirect	by Spouse
No	4	S	Indirect	by Spouse
No	4	S	Indirect	by Spouse
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	Disposition	2015-02-03	43,200	$0.00	43,200	$0.00

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
86,400			No	4	M	Direct

Footnotes

Each performance share represents a contingent right to receive a restricted stock unit upon MPWR's common stock achieving a 20-day average closing price of $47.00 per share from January 1, 2014 through December 31, 2018 (the "Performance Period"). Credited performance units are still subject to an additional, quarterly, five-year time-based vesting schedule beginning January 1, 2019, subject to acceleration under certain circumstances.
Acquired through the Company's qualified ESPP program.
1/16 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.
Shares sold to pay tax obligations resulting from the vesting of restricted stock units.
Each performance unit will vest as follows: one share of MPWR common stock will be credited for each performance unit if the price of MPWR common stock achieves a 20-day average closing price of $40.00 per share from January 1, 2014 through December 31, 2018 (the "Performance Period"), and up to four additional shares will be credited for each performance unit if the 20-day average closing price reaches $43.00, $47.00, $52.00 and $56.00 (that is, one share per price level) during the Performance Period. Credited performance units are then subject to an additional, quarterly, five-year time-based vesting schedule beginning January 1, 2019, subject to acceleration under certain circumstances.