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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	5808 Lake Washington Blvd Ne Kirkland WA 98033	Sr. V.p.of Sales And Marketing	No	No	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	2023-02-06	723	$446.87	192,133	No	4	S	Direct
Common Stock	Acquisiton	2023-02-07	34,740	$0.00	226,873	No	4	A	Direct

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

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Common Stock	13,502	Indirect	by Family Trust
Common Stock	19,458	Indirect	Christina Sciammas Trust FBO Oski Crew
Common Stock	19,458	Indirect	Maurice Sciammas Trust FBO Oski Crew
Common Stock	2,000	Indirect	Rosalind Sciammas Family 2021 Trust
Common Stock	23,015	Indirect	By Sciammas Trust 2020
Common Stock	26,700	Indirect	By GRAT
Common Stock	1,699	Indirect	The Chloe Liliane Sciammas 2020 Irrevocable Trust
Common Stock	1,699	Indirect	The Joseph Roger Sciammas 2020 Irrevocable Trust
Common Stock	5,000	Indirect	Clement Sciammas Family 2021 Trust
Common Stock	2,000	Indirect	Peter Rafferty and Eric Toothill 2021Trust
Common Stock	1,699	Indirect	The Patrick Francis Sciammas 2020 Irrevocable Trust

Footnotes

The reported sales were to cover taxes upon the vesting of restricted stock units, as required by the Company's equity incentive plan.
On February 2, 2021, the reporting person was granted a target of 11,580 shares of restricted stock units, with the right to earn up to 300% of the target shares, subject to satisfaction of pre-determined, performance-based vesting criteria. On February 7, 2023, the Company's Compensation Committee of the Board of Directors determined and approved the achievement of the performance criteria for the restricted stock units, which resulted in 23,160 additional shares being earned by the reporting person. Of the 34,740 restricted stock units that were awarded, 17,370 will vest immediately and 17,370 will vest quarterly in the next two years.