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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
1415033	Theodore Blegen	5808 Lake Washington Blvd Ne Kirkland WA 98033	Cfo	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	608	$446.87	121,195	No	4	S	Direct
Common Stock	Acquisiton	2023-02-07	22,857	$0.00	144,052	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	5,331	Indirect	Irrevocable Trust FBO Theodore F. Blegen
Common Stock	5,331	Indirect	Irrevocable Trust FBO Sarah N. Blegen

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 7,619 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 15,238 additional shares being earned by the reporting person. Of the 22,857 restricted stock units that were awarded, 11,429 will vest immediately and 11,428 will vest quarterly in the next two years.