Michael Hsing sold $59M of MPWR
CEO at MONOLITHIC POWER SYSTEMS INC. 40,000 shares at an average of $1,482.75, traded May 18, 2026, filed May 20, 2026.
Score components
- +25RoleCEO
- +25Trade size$59.3M at market
- 0Share of holdings soldSold 4.5% of holdings
- +15Cluster8 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.
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 0001214659-26-006625, as filed. Open on EDGAR
| Date | Transaction | Shares | Price | Value | Holdings after | Filed |
|---|---|---|---|---|---|---|
| May 18, 2026 | SOpen-market sale Common Stock | -3,424 | $1,462.61 | $5.0M | 884,839 | May 20, 2026 |
| May 18, 2026 | SOpen-market sale Common Stock | -5,819 | $1,467.62 | $8.5M | 879,020 | May 20, 2026 |
| May 18, 2026 | SOpen-market sale Common Stock | -5,049 | $1,472.84 | $7.4M | 873,971 | May 20, 2026 |
| May 18, 2026 | SOpen-market sale Common Stock | -4,082 | $1,476.96 | $6.0M | 869,889 | May 20, 2026 |
| May 18, 2026 | SOpen-market sale Common Stock | -5,737 | $1,482.51 | $8.5M | 864,152 | May 20, 2026 |
| May 18, 2026 | SOpen-market sale Common Stock | -6,688 | $1,486.76 | $9.9M | 857,464 | May 20, 2026 |
| May 18, 2026 | SOpen-market sale Common Stock | -862 | $1,491.48 | $1.3M | 856,602 | May 20, 2026 |
| May 18, 2026 | SOpen-market sale Common Stock | -608 | $1,499.46 | $912k | 855,994 | May 20, 2026 |
| May 18, 2026 | SOpen-market sale Common Stock | -2,929 | $1,503.05 | $4.4M | 853,065 | May 20, 2026 |
| May 18, 2026 | SOpen-market sale Common Stock | -3,769 | $1,507.70 | $5.7M | 849,296 | May 20, 2026 |
| May 18, 2026 | SOpen-market sale Common Stock | -551 | $1,513.11 | $834k | 848,745 | May 20, 2026 |
| May 18, 2026 | SOpen-market sale Common Stock | -352 | $1,518.15 | $534k | 848,393 | May 20, 2026 |
| May 18, 2026 | SOpen-market sale Common Stock | -130 | $1,521.43 | $198k | 848,263 | May 20, 2026 |
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.