Mr. Victor K. Lee - 02 Jan 2026 Form 4 Insider Report for MONOLITHIC POWER SYSTEMS INC (MPWR)

Role
Director
Signature
/s/ Saria Tseng, attorney-in-fact for Mr. Victor K. Lee
Issuer symbol
MPWR
Transactions as of
02 Jan 2026
Net transactions value
-$558,516
Form type
4
Filing time
06 Jan 2026, 18:25:24 UTC
Previous filing
29 Dec 2025
Next filing
05 Feb 2026

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Lee Victor K Director 1555 PALM BEACH LAKES BLVD., WEST PALM BEACH /s/ Saria Tseng, attorney-in-fact for Mr. Victor K. Lee 02 Jan 2026 0001292133

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction MPWR Common Stock Sale $558,516 -600 -2.1% $930.86 27,967 02 Jan 2026 Direct F1
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Buy Plan / Sale Plan: These are also open market purchases/sales of shares, but in this case the transaction is part of a trading plan. Rule 10b5-1 allows insiders to setup a trading plan to buy/sell stocks over a certain period of time. Since the purchases/sales are predetermined, this protects the insiders from violating insider trading law.

Transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c).

Explanation of Responses:

Id Content
F1 This transaction was made pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on 8/25/2025.