Michael Hsing sold $17M of MPWR
CEO at MONOLITHIC POWER SYSTEMS INC. 20,231 shares at an average of $829.10, traded Aug 15, 2025, filed Aug 18, 2025.
Score components
- +25RoleCEO
- +25Trade size$16.8M at market
- 0Share of holdings soldSold 2.4% of holdings
- +15Cluster5 insiders selling within 14 days
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.
This signal so far: 1m +3.2%, 3m +5.7%, 6m +38.2%.
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 0001214659-25-012411, as filed. Open on EDGAR
| Date | Transaction | Shares | Price | Value | Holdings after | Filed |
|---|---|---|---|---|---|---|
| Aug 15, 2025 | SOpen-market sale Common Stock | -2,603 | $825.69 | $2.1M | 832,295 | Aug 18, 2025 |
| Aug 15, 2025 | SOpen-market sale Common Stock | -2,555 | $826.64 | $2.1M | 829,740 | Aug 18, 2025 |
| Aug 15, 2025 | SOpen-market sale Common Stock | -3,878 | $827.72 | $3.2M | 825,862 | Aug 18, 2025 |
| Aug 15, 2025 | SOpen-market sale Common Stock | -396 | $828.64 | $328k | 825,466 | Aug 18, 2025 |
| Aug 15, 2025 | SOpen-market sale Common Stock | -4,101 | $829.45 | $3.4M | 821,365 | Aug 18, 2025 |
| Aug 15, 2025 | SOpen-market sale Common Stock | -2,100 | $830.46 | $1.7M | 819,265 | Aug 18, 2025 |
| Aug 15, 2025 | SOpen-market sale Common Stock | -1,953 | $831.57 | $1.6M | 817,312 | Aug 18, 2025 |
| Aug 15, 2025 | SOpen-market sale Common Stock | -1,510 | $832.57 | $1.3M | 815,802 | Aug 18, 2025 |
| Aug 15, 2025 | SOpen-market sale Common Stock | -535 | $833.37 | $446k | 815,267 | Aug 18, 2025 |
| Aug 15, 2025 | SOpen-market sale Common Stock | -200 | $834.92 | $167k | 815,067 | Aug 18, 2025 |
| Aug 15, 2025 | SOpen-market sale Common Stock | -400 | $836.40 | $335k | 814,667 | Aug 18, 2025 |
Related signals
Other insiders at MONOLITHIC POWER SYSTEMS INC and this insider’s other filings.
| Score | Company | Insider | Value | Holdings | Filed |
|---|---|---|---|---|---|
| 30Weak | MONOLITHIC POWER SYSTEMS INC | Michael Hsing CEO | $40M 30,000 shares | -4% | |
| 36Weak | MONOLITHIC POWER SYSTEMS INC | Robert W Dean II Interim CFO | $42k 32 shares | -0% | |
| 31Weak | MONOLITHIC POWER SYSTEMS INC | Kuo Wei Herbert Chang director | $64k 50 shares | -9% | |
| 37Weak | MONOLITHIC POWER SYSTEMS INC | Robert W Dean II Interim CFO | $8,482 6 shares | -0% | |
| 38Weak | MONOLITHIC POWER SYSTEMS INC | Kuo Wei Herbert Chang director | $71k 50 shares | -8% | |
| 48Moderate | MONOLITHIC POWER SYSTEMS INC | Robert W Dean II Interim CFO | $141k 105 shares | -1% | |
| 16Weak | MONOLITHIC POWER SYSTEMS INC | Maurice Sciammas EVP, WW Sales & Marketing | $40k 30 shares | -3% | |
| 20Weak | MONOLITHIC POWER SYSTEMS INC | Maurice Sciammas EVP, WW Sales & Marketing | $20M 15,000 shares | -9% | |
| 1Weak | MONOLITHIC POWER SYSTEMS INC | Maurice Sciammas EVP, WW Sales & Marketing | $41k 30 shares | -3% | |
| 16Weak | MONOLITHIC POWER SYSTEMS INC | Maurice Sciammas EVP, WW Sales & Marketing | $46k 30 shares | -2% |
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.