Mr. Victor K. Lee - 09 Feb 2026 Form 4 Insider Report for MONOLITHIC POWER SYSTEMS INC (MPWR)

Reporting relationship: Director
Issuer ticker: MPWR
Reported as of: 09 Feb 2026
Net transaction value: -$484,864
SEC form: 4
Accepted by SEC: 11 Feb 2026, 18:44:43 UTC
Prior SEC filing: 05 Feb 2026
Source filing: View source filing
Reporting owner signature: /s/ Saria Tseng, attorney-in-fact for Mr. Victor K. Lee

Key filing fact

Mr. Victor K. Lee filed Form 4 for MONOLITHIC POWER SYSTEMS INC (MPWR) on 11 Feb 2026.

Key facts

This page summarizes Mr. Victor K. Lee's Form 4 filing for MONOLITHIC POWER SYSTEMS INC (MPWR).
1 reported transaction and 0 derivative rows are listed below.
Accepted by SEC: 11 Feb 2026, 18:44.

Change

Previous filing in this sequence was filed on 05 Feb 2026.
Current net transaction value: -$484,864.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001292133 Primary reporting owner

Lee Victor K

Relationship: Director
Address: 1555 PALM BEACH LAKES BLVD., WEST PALM BEACH
Signature: /s/ Saria Tseng, attorney-in-fact for Mr. Victor K. Lee
Signature date: 11 Feb 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

MPWR transaction

Common Stock

Sale

Transaction value: $484,864
Shares: -400
Change %: -1.4%
Price: $1212.16
Shares after: 27,756
Date: 09 Feb 2026
Ownership: Direct
Footnotes: F1

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Rule 10b5-1 trading plan

These transactions were reported as open-market trades under a Rule 10b5-1 plan. The plan lets an insider set trading instructions in advance, which can reduce the risk of trading while in possession of material nonpublic information.

Original filing language: transaction made pursuant to a contract, instruction, or written plan intended to satisfy Rule 10b5-1(c).

Explanation of responses 1 footnote

Footnote F1

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