Michael Hsing - 06 Feb 2026 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
Issuer symbol: MPWR
Transactions as of: 06 Feb 2026
Net transactions value: -$64,323,824
Form type: 4
Filing time: 10 Feb 2026, 18:56:26 UTC
Previous filing: 05 Feb 2026
Next filing: 12 Feb 2026
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Hsing Michael	CEO, Director	1555 PALM BEACH LAKES BLVD., WEST PALM BEACH	/s/ Saria Tseng, attorney-in-fact for Mr. Michael R. Hsing	10 Feb 2026	0001308676

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	MPWR	Common Stock	Sale	$64,323,824	-54,923	-5.3%	$1171.16	988,234	06 Feb 2026	Direct	F1
holding	MPWR	Common Stock						133,040	06 Feb 2026	by M Hsing 04 Trust
holding	MPWR	Common Stock						12,825	06 Feb 2026	ZH Family 2020 Trust

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

Explanation of Responses:

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