4Filing Date: Aug 19, 2026
Monolithic Power Systems (MPWR)
Statement of Changes in Beneficial Ownership
View SEC Filing
ACC: 0001214659-26-010630
Total Value$8.5K
Trades2
Insiders1
Transaction Details
DEAN ROBERT W II
Interim CFO·Direct
Sell · Dispose
Common Stock
Shares-6
Price$1413.64
Total Value$8.5K
Shares Owned After7.13K
Transaction DateAug 17, 2026
Footnotes ▸
The reported sale was to cover tax withholding obligations upon the vesting of restricted stock units.
DEAN ROBERT W II
Interim CFO·Indirect · Held by Parent & Daughter
Common Stock
Shares0
Price-
Total Value$0
Shares Owned After65
Post-Transaction Holdings
DEAN ROBERT W II · Interim CFO
| Security | Shares | Change |
|---|---|---|
| Common Stock | 7.19K | -6 (-0.08%) |
auto_awesomeDeep Analysis
Deep Analysis
Interim CFO Robert W. Dean II sold 6 shares of Monolithic Power Systems at $1,413.64 to cover RSU tax withholding in a passive, administrative transaction.
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Original SEC Filing Textexpand_more
=== SEC Form 4 — Statement of Changes in Beneficial Ownership ===
Document Type: 4
Period of Report: 2026-08-17
10b5-1 Pre-arranged Plan: No
--- Issuer ---
Name: MONOLITHIC POWER SYSTEMS, INC. (MPWR)
CIK: 0001280452
--- Reporting Owner ---
Name: DEAN ROBERT W II
CIK: 0001445300
Role: Officer (Interim CFO)
--- Non-Derivative Transactions ---
[Transaction #1]
Security: Common Stock
Date: 2026-08-17 | Code: S (Open market sale)
Shares: -6 | Price: $1,413.64
Total Value: $8,481.84
Shares Owned After: 7,126 | Ownership: D (Direct)
Footnotes:
[F1] The reported sale was to cover tax withholding obligations upon the vesting of restricted stock units.
--- Holdings ---
[Holding #1]
Security: Common Stock
Ownership: I (Indirect)
--- Footnotes (Complete Index) ---
F1: The reported sale was to cover tax withholding obligations upon the vesting of restricted stock units.
--- Signature ---
/s/ /s/ Saria Tseng, attorney-in-fact for Mr. Robert W. Dean II (2026-08-19)