Maurice Sciammas is VP at MONOLITHIC POWER SYSTEMS, INC. (MPWR). They have made 186 open-market trades across 1 company since 2006, most recently 2026-08-04.
CIK 0001360833
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 186 sales. Too few scored purchases to measure a record yet.
| Ticker | Shares | Value |
|---|---|---|
| MPWR | 36,062 | $43.7M |
Shares reported on the most recent Form 4, priced at the 2026-08-06 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 | 2026-08-03 | 2026-08-05 | $1343.94 | $40K | +7.7% | -7.0% | — |
| MPWR | SELL · 10b5-1 | 2026-07-15 | 2026-07-17 | $1349.73 | $20.2M | -6.5% | +5.9% | -6.5% |
| MPWR | SELL · 10b5-1 | 2026-07-01 | 2026-07-06 | $1351.61 | $41K | +2.3% | +5.4% | +16.0% |
| MPWR | SELL · 10b5-1 | 2026-06-01 | 2026-06-03 | $1533.95 | $46K | +1.4% | -17.5% | -24.7% |
| MPWR | SELL · 10b5-1 | 2026-05-15 | 2026-05-19 | $1561.40 | $18.7M | +3.5% | +4.8% | -5.1% |
| MPWR | SELL | 2026-05-05 | 2026-05-06 | $1583.81 | $602K | -7.9% | -8.5% | -17.3% |
| MPWR | SELL · 10b5-1 | 2026-05-04 | 2026-05-06 | $1588.73 | $48K | -7.9% | -8.5% | -17.3% |
| MPWR | SELL · 10b5-1 | 2026-04-01 | 2026-04-03 | $1116.44 | $33K | +19.9% | +39.3% | +14.3% |
| MPWR | SELL · 10b5-1 | 2026-03-20 | 2026-03-24 | $1095.07 | $33K | +5.7% | +42.6% | +37.8% |
| MPWR | SELL | 2026-02-11 | 2026-02-12 | $1179.98 | $236K | +7.2% | -6.2% | +43.7% |
| MPWR | SELL | 2026-02-06 | 2026-02-10 | $1171.16 | $26.8M | +2.2% | -11.3% | +42.6% |
| MPWR | SELL | 2025-11-24 | 2025-11-25 | $895.23 | $7.1M | +6.9% | +2.8% | +29.3% |
| MPWR | SELL | 2025-11-19 | 2025-11-20 | $870.20 | $12.0M | +10.9% | +9.4% | +37.5% |
| MPWR | SELL | 2025-11-19 | 2025-11-20 | $881.66 | $49.3M | +10.9% | +9.4% | +37.5% |
| MPWR | SELL | 2025-11-05 | 2025-11-06 | $986.81 | $197K | -9.2% | +4.2% | +20.4% |
| MPWR | SELL · 10b5-1 | 2025-05-12 | 2025-05-12 | $701.00 | $8.4M | -4.8% | +2.1% | +13.0% |
| MPWR | SELL | 2025-02-10 | 2025-02-12 | $717.10 | $949K | -6.9% | -13.4% | +5.5% |
| MPWR | SELL | 2025-02-07 | 2025-02-11 | $701.87 | $8.6M | -5.3% | -17.2% | +2.9% |
| MPWR | SELL | 2024-11-08 | 2024-11-13 | $765.14 | $1.3M | -0.4% | +0.9% | +15.9% |
| MPWR | SELL | 2024-10-07 | 2024-10-08 | $929.88 | $17.9M | -0.3% | -15.7% | -31.4% |
| MPWR | SELL | 2024-08-08 | 2024-08-12 | $778.39 | $1.3M | +8.1% | +6.6% | -22.9% |
| MPWR | SELL | 2024-07-22 | 2024-07-24 | $831.58 | $5.3M | -2.2% | +18.8% | +11.3% |
| MPWR | SELL | 2024-07-08 | 2024-07-10 | $843.91 | $18.1M | -2.2% | -6.1% | +5.3% |
| MPWR | SELL | 2024-05-08 | 2024-05-09 | $690.00 | $600K | +5.2% | +8.4% | +5.2% |
| MPWR | SELL | 2024-04-08 | 2024-04-09 | $681.80 | $13.0M | -10.8% | +6.8% | +28.5% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.