Saria Tseng - 24 Dec 2025 Form 4 Insider Report for MONOLITHIC POWER SYSTEMS INC (MPWR)

Role: EVP & General Counsel
Signature: /s/ Saria Tseng
Issuer symbol: MPWR
Transactions as of: 24 Dec 2025
Net transactions value: $0
Form type: 4
Filing time: 30 Dec 2025, 18:08:47 UTC
Previous filing: 28 Nov 2025
Next filing: 05 Feb 2026
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Tseng Saria	EVP & General Counsel	1555 PALM BEACH LAKES BLVD., WEST PALM BEACH	/s/ Saria Tseng	24 Dec 2025	0001312593

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	MPWR	Common Stock	Gift	$0	-1,000	-0.6%	$0.000000	166,331	24 Dec 2025	Direct	F1
transaction	MPWR	Common Stock	Gift	$0	+1,000		$0.000000	1,000	24 Dec 2025	C&T Discovery Foundation	F2

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

Explanation of Responses:

Id	Content
F1	The reported transaction involved a transfer of securities by gift from the reporting person's direct holdings to a 501(c)(3) foundation. No funds were exchanged and no sale of shares occurred in the transfer of the shares.
F2	The reported transaction involved a transfer of securities by gift from the reporting person's direct holdings to a 501(c)(3) foundation. The reporting person is the president of the foundation and maintains management and investment control over the shares. No funds were exchanged and no sale of shares occurred in the transfer of the shares.