Michael Hsing, CEO at MONOLITHIC POWER SYSTEMS INC (MPWR), sold 40,000 shares at $1462.61 ($59.3M) on 2026-05-18, disclosed to the SEC on 2026-05-20.
Seasonal sale ($59.3M) by CEO — this insider has traded MPWR in May in at least three consecutive prior years. Pattern-driven, low signal.
Negative factors outweigh the positive ones.
| # | Price | Shares | Value | % of Total |
|---|---|---|---|---|
| 1 | $1462.61 | 3,424 | $5.0M | 8.4% |
| 2 | $1467.62 | 5,819 | $8.5M | 14.4% |
| 3 | $1472.84 | 5,049 | $7.4M | 12.5% |
| 4 | $1476.96 | 4,082 | $6.0M | 10.2% |
| 5 | $1482.51 | 5,737 | $8.5M | 14.3% |
| 6 | $1486.76 | 6,688 |
| $9.9M |
| 16.8% |
| 7 | $1491.48 | 862 | $1.3M | 2.2% |
| 8 | $1499.46 | 608 | $912K | 1.5% |
| 9 | $1503.05 | 2,929 | $4.4M | 7.4% |
| 10 | $1507.70 | 3,769 | $5.7M | 9.6% |
| 11 | $1513.11 | 551 | $834K | 1.4% |
| 12 | $1518.15 | 352 | $534K | 0.9% |
| 13 | $1521.43 | 130 | $198K | 0.3% |
| Total | $1482.75 avg | 40,000 | $59.3M | 100% |
| Filing → |
| MPWR | SELL | 2026-02-13 | $39.2M | — | Filing → |
| MPWR | SELL | 2026-02-12 | $38.8M | — | Filing → |
| MPWR | SELL | 2026-02-10 | $64.3M | — | Filing → |