MPWR insider trades & Congress trades
Monolithic Power Systems, Inc.: public insider filings and Congress disclosures, in one place.
Bourse has recorded 13 open-market insider transactions in Monolithic Power Systems, Inc. (MPWR) (0 purchases with code P and 13 sales with code S), the most recent on September 28, 2026.
In the last 90 days: 0 purchases by 0 insiders ($0) and 12 sales by 3 ($40.5M).
Insider transactions
SEC Form 4, open-market purchases (P) and sales (S) only. Awards, option exercises and tax withholding are excluded. “After” shows the stock’s return over the month following the trade, where available.
| Date | Insider | Role | Type | Shares | Price | Value | After 1M |
|---|---|---|---|---|---|---|---|
| Sep 28, 2026 | Hsing Michael | CEO | Sell | 596 | $1,323.31 | $789K | −0.1% |
| Sep 28, 2026 | Hsing Michael | CEO | Sell | 2,121 | $1,328.54 | $2.82M | −0.1% |
| Sep 28, 2026 | Hsing Michael | CEO | Sell | 1,111 | $1,333.34 | $1.48M | −0.1% |
| Sep 28, 2026 | Hsing Michael | CEO | Sell | 2,949 | $1,338.66 | $3.95M | −0.1% |
| Sep 28, 2026 | Hsing Michael | CEO | Sell | 5,783 | $1,343.76 | $7.77M | −0.1% |
| Sep 28, 2026 | Hsing Michael | CEO | Sell | 6,343 | $1,347.15 | $8.54M | −0.1% |
| Sep 28, 2026 | Hsing Michael | CEO | Sell | 10,967 | $1,351.43 | $14.8M | −0.1% |
| Sep 28, 2026 | Hsing Michael | CEO | Sell | 130 | $1,356.94 | $176K | −0.1% |
| Aug 24, 2026 | Chang Kuo Wei Herbert | – | Sell | 50 | $1,281.57 | $64K | +0.0% |
| Aug 24, 2026 | Dean Robert W Ii | Interim CFO | Sell | 32 | $1,297.72 | $42K | +0.0% |
| Aug 17, 2026 | Dean Robert W Ii | Interim CFO | Sell | 6 | $1,413.64 | $8K | −0.1% |
| Aug 11, 2026 | Chang Kuo Wei Herbert | – | Sell | 50 | $1,420.00 | $71K | −0.2% |
| Aug 5, 2026 | Dean Robert W Ii | Interim CFO | Sell | 105 | $1,344.27 | $141K | −0.1% |
Data as of November 8, 2026. Public filings only. A purchase or sale by a politician or an insider does not by itself imply any wrongdoing.
New to these filings? Read how to read a Form 4, how Congress trades are disclosed and what insider cluster buying means. Sources and limits are on the Methodology page.
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