Insider tradingForm 4
MONOLITHIC POWER SYSTEMS, INC. (MPWR) Insider Trading
5 open-market trades reported since Aug 13, 2026: 0 purchases worth $0 and 5 sales worth $40.5M.
By insider
| Insider | Role | Buys | Bought | Sells | Sold |
|---|---|---|---|---|---|
| Michael Hsing | CEO | 0 | $0 | 1 | $40.3M |
| Robert W. Dean II | CFO | 0 | $0 | 2 | $50K |
| Kuo Wei Herbert Chang | Director | 0 | $0 | 2 | $135K |
All trades
| Filed | Insider | Type | Value | 3 mo. after |
|---|---|---|---|---|
| Sep 30 | Michael HsingCEO | ▼ SELL10b5-1 | $40.3M | |
| Aug 26 | Robert W. Dean IICFO | ▼ SELL | $42K | |
| Aug 25 | Kuo Wei Herbert ChangDirector | ▼ SELL | $64K | |
| Aug 19 | Robert W. Dean IICFO | ▼ SELL | $8K | |
| Aug 13 | Kuo Wei Herbert ChangDirector | ▼ SELL | $71K |
Source: SEC Form 4 filings, retrieved Oct 28, 2026. How we read filings