Michael Hsing - 09 Dec 2025 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
09 Dec 2025
Transactions value $
$0
Form type
4
Filing time
11 Dec 2025, 16:03:37 UTC
Previous filing
13 Nov 2025
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 09 Dec 2025 0001308676

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction MPWR Common Stock Gift $0 -12.3K -1.34% $0.00 906K 09 Dec 2025 Direct F1
holding MPWR Common Stock 133K 09 Dec 2025 by M Hsing 04 Trust
holding MPWR Common Stock 12.8K 09 Dec 2025 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 transaction involved a transfer of securities by gift from the reporting person's direct holdings to a 501(c)(3) foundation. The Company has determined that the reporting person does not have any management or investment control or any other pecuniary interest in the shares after the transfer. No funds were exchanged and no sale of shares occurred in the transfer.