Michael Hsing is CEO at MONOLITHIC POWER SYSTEMS, INC. (MPWR). They have made 201 open-market trades across 1 company since 2006, most recently 2026-09-28.
CIK 0001308676
Unrated. We grade insiders only on stock they chose to buy on the open market. Grants, option exercises and vesting say nothing about timing, so they don't count — which is why someone can file often and still have no grade. It isn't a bad sign: unrated buys beat every graded tier below A.
0 open-market purchases, against 201 sales. Too few scored purchases to measure a record yet.
| Ticker | Shares | Value |
|---|---|---|
| MPWR | 818,264 | $990.5M |
Shares reported on the most recent Form 4, priced at the 2026-09-30 close.
Counted per filing, not per execution lot — a purchase filled in several tranches is one decision.
| Ticker | Type | Traded | Filed | Price | Value | 7d Stock | 30d Stock | 90d Stock |
|---|---|---|---|---|---|---|---|---|
| MPWR | SELL · 10b5-1 | 2026-09-28 | 2026-09-30 | $1344.97 | $40.3M | -2.1% | — | — |
| MPWR | SELL | 2026-05-18 | 2026-05-20 | $1482.75 | $59.3M | +5.7% | -0.0% | -13.3% |
| MPWR | SELL | 2026-02-12 | 2026-02-17 | $1171.83 | $38.7M | -3.0% | -7.2% | +26.2% |
| MPWR | SELL | 2026-02-11 | 2026-02-13 | $1188.92 | $39.2M | +2.6% | -6.3% | +40.4% |
| MPWR | SELL | 2026-02-10 | 2026-02-12 | $1142.28 | $38.8M | +7.2% | -6.2% | +43.7% |
| MPWR | SELL | 2026-02-06 | 2026-02-10 | $1171.16 | $64.3M | +2.2% | -11.3% | +42.6% |
| MPWR | SELL | 2025-11-12 | 2025-11-13 | $965.52 | $71.4M | +3.4% | +8.0% | +36.1% |
| MPWR | SELL | 2025-11-11 | 2025-11-13 | $958.22 | $70.5M | +3.4% | +8.0% | +36.1% |
| MPWR | SELL | 2025-08-15 | 2025-08-18 | $828.92 | $31.3M | +0.5% | +2.7% | +5.0% |
| MPWR | SELL · 10b5-1 | 2025-02-18 | 2025-02-20 | $700.00 | $3.6M | -14.1% | -8.3% | -0.9% |
| MPWR | SELL | 2025-02-10 | 2025-02-12 | $717.10 | $3.7M | -6.9% | -13.4% | +5.5% |
| MPWR | SELL · 10b5-1 | 2025-02-07 | 2025-02-11 | $700.00 | $8.4M | -5.3% | -17.2% | +2.9% |
| MPWR | SELL · 10b5-1 | 2025-01-24 | 2025-01-28 | $700.00 | $2.5M | +17.0% | -1.0% | -4.9% |
| MPWR | SELL | 2024-11-08 | 2024-11-13 | $765.15 | $4.3M | -0.4% | +0.9% | +15.9% |
| MPWR | SELL | 2024-08-09 | 2024-08-13 | $815.80 | $5.5M | +8.2% | +3.5% | -25.2% |
| MPWR | SELL | 2024-08-08 | 2024-08-12 | $778.39 | $4.3M | +8.1% | +6.6% | -22.9% |
| MPWR | SELL | 2024-07-22 | 2024-07-24 | $831.58 | $16.0M | -2.2% | +18.8% | +11.3% |
| MPWR | SELL | 2024-07-01 | 2024-07-02 | $805.33 | $3.8M | +4.5% | -5.8% | +10.9% |
| MPWR | SELL | 2024-06-03 | 2024-06-05 | $730.80 | $9.7M | +9.3% | +11.2% | +10.8% |
| MPWR | SELL | 2024-05-08 | 2024-05-09 | $690.00 | $1.9M | +5.2% | +8.4% | +5.2% |
| MPWR | SELL | 2024-05-01 | 2024-05-03 | $661.31 | $7.8M | +3.1% | +1.8% | +9.2% |
| MPWR | SELL | 2024-04-01 | 2024-04-03 | $677.21 | $9.1M | -2.0% | +7.2% | +25.6% |
| MPWR | SELL | 2024-03-01 | 2024-03-04 | $726.20 | $10.7M | -4.1% | -10.0% | +1.3% |
| MPWR | SELL | 2024-02-08 | 2024-02-09 | $680.00 | $1.9M | -1.5% | -4.4% | -5.9% |
| MPWR | SELL | 2024-02-05 | 2024-02-07 | $641.00 | $2.4M | +4.8% | +7.7% | +3.3% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.