Michael Hsing - May 2, 2023 Form 4 Insider Report for MONOLITHIC POWER SYSTEMS INC (MPWR)

Role: CEO, Director
Signature: /s/ Saria Tseng, attorney-in-fact for Mr. Michael R. Hsing
Stock symbol: MPWR
Transactions as of: May 2, 2023
Transactions value $: -$5,211,229
Form type: 4
Date filed: 5/4/2023, 04:41 PM
Previous filing: Apr 6, 2023
Next filing: May 5, 2023

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	MPWR	Common Stock	Award	$0	+28.2K	+2.69%	$0.00	1.08M	May 2, 2023	Direct	F1
transaction	MPWR	Common Stock	Sale	-$5.21M	-11.2K	-1.04%	$463.55	1.07M	May 3, 2023	Direct	F2
holding	MPWR	Common Stock						133K	May 2, 2023	by M Hsing 04 Trust
holding	MPWR	Common Stock						12.8K	May 2, 2023	ZH Family 2020 Trust

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	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.
F2	The reported sales were to cover taxes upon the vesting of restricted stock units, as required by the Company's equity incentive plan.

Content

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.