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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	5808 Lake Washington Blvd Ne Kirkland WA 98033	Ceo	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	Acquisiton	2023-05-02	28,210	$0.00	1,078,259	No	4	A	Direct
Common Stock	Disposition	2023-05-03	11,242	$463.55	1,067,017	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	133,040	Indirect	by M Hsing 04 Trust
Common Stock	12,825	Indirect	ZH Family 2020 Trust

Footnotes

On February 2, 2021, the reporting person was granted a target number of 28,210 performance units that can be earned subject to the achievement of two performance goals related to certain environmental objectives, with a performance period through December 31, 2023. The performance units vest upon achievement of the goals, but no earlier than December 31, 2022. Once vested, the performance units have a post-vesting sales restriction period of one year. On May 2, 2023, the Compensation Committee of the Board of Directors determined that the environmental goals had been satisfied, which resulted in 28,210 units being credited with the vesting terms described above.
The reported sales were to cover taxes upon the vesting of restricted stock units, as required by the Company's equity incentive plan.