Michael Hsing sold $40M of MPWR
CEO at MONOLITHIC POWER SYSTEMS INC. 30,000 shares at an average of $1,344.97, traded Sep 28, 2026, filed Sep 30, 2026.
Score components
- +25RoleCEO
- +25Trade size$40.3M at market
- 0Share of holdings soldSold 3.5% of holdings
- 0ClusterNo other insider selling within 14 days
- -2010b5-1 planPre-scheduled under a 10b5-1 plan
What happened after comparable sells
Same side and tier, against the S&P 500, at 1, 3 and 6 months. Shown to Pro users; the whole table is on the backtest page.
Price around the trade, and since
From a quarter before the trade to today. The arrow is the trade, the circle the day the filing reached EDGAR, which is the first day anyone outside could act; the dotted line is the S&P 500 rebased to that day's close.
Daily candles, adjusted for splits and dividends. Green arrows are insider buys, red are sells, sized by value; the dashed line is the close on the filing day, the dotted line SPY rebased to it.Charts by TradingView Lightweight Charts™
Rows in this filing
Every transaction in Form 4 0001214659-26-012375, as filed. Open on EDGAR
| Date | Transaction | Shares | Price | Value | Holdings after | Filed |
|---|---|---|---|---|---|---|
| Sep 28, 2026 | SOpen-market sale Common Stock10b5-1 | -596 | $1,323.31 | $789k | 847,668 | 12 d ago |
| Sep 28, 2026 | SOpen-market sale Common Stock10b5-1 | -2,121 | $1,328.54 | $2.8M | 845,547 | 12 d ago |
| Sep 28, 2026 | SOpen-market sale Common Stock10b5-1 | -1,111 | $1,333.34 | $1.5M | 844,436 | 12 d ago |
| Sep 28, 2026 | SOpen-market sale Common Stock10b5-1 | -2,949 | $1,338.66 | $3.9M | 841,487 | 12 d ago |
| Sep 28, 2026 | SOpen-market sale Common Stock10b5-1 | -5,783 | $1,343.76 | $7.8M | 835,704 | 12 d ago |
| Sep 28, 2026 | SOpen-market sale Common Stock10b5-1 | -6,343 | $1,347.15 | $8.5M | 829,361 | 12 d ago |
| Sep 28, 2026 | SOpen-market sale Common Stock10b5-1 | -10,967 | $1,351.43 | $15M | 818,394 | 12 d ago |
| Sep 28, 2026 | SOpen-market sale Common Stock10b5-1 | -130 | $1,356.94 | $176k | 818,264 | 12 d ago |
Related signals
Other insiders at MONOLITHIC POWER SYSTEMS INC and this insider’s other filings.
| Score | Company | Insider | Value | Holdings | Filed |
|---|---|---|---|---|---|
| 21Weak | MPWRsell MONOLITHIC POWER SYSTEMS INC | Kuo Wei Herbert Chang director | $37k 50 shares | -7% | |
| 28Weak | MPWRsell MONOLITHIC POWER SYSTEMS INC | Kuo Wei Herbert Chang director | $70k 100 shares | -13% | |
| 28Weak | MPWRsell MONOLITHIC POWER SYSTEMS INC | Kuo Wei Herbert Chang director | $65k 100 shares | -11% | |
| 38Weak | MONOLITHIC POWER SYSTEMS INC | Michael Hsing CEO | $3.6M 5,200 shares | -1% | |
| 46Moderate | MONOLITHIC POWER SYSTEMS INC | Theodore Blegen EVP and CFO | $381k 532 shares | -1% | |
| 58Moderate | MONOLITHIC POWER SYSTEMS INC | Michael Hsing CEO | $1.9M 2,594 shares | -0% | |
| 38Weak | MONOLITHIC POWER SYSTEMS INC | Michael Hsing CEO | $8.4M 11,964 shares | -1% | |
| 30Weak | MONOLITHIC POWER SYSTEMS INC | Michael Hsing CEO | $2.5M 3,636 shares | -0% | |
| 27Weak | MONOLITHIC POWER SYSTEMS INC | Theodore Blegen EVP and CFO | $1.5M 2,500 shares | -4% | |
| 56Moderate | MONOLITHIC POWER SYSTEMS INC | Theodore Blegen EVP and CFO | $562k 734 shares | -1% |
Not investment advice. Scores and forward returns are decision support built from public SEC filings and past prices; they describe what happened after comparable filings, not what will happen after this one. Do your own research and size your risk.