Jeff Zhou is Director at MONOLITHIC POWER SYSTEMS INC (MPWR). They have made 34 open-market trades across 1 company since 2012, most recently 2026-05-26.
CIK 0001480772
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 34 sales. Too few scored purchases to measure a record yet.
| Ticker | Shares | Value |
|---|---|---|
| MPWR | 3,800 | $4.6M |
Shares reported on the most recent Form 4, priced at the 2026-05-27 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 | 2026-05-26 | 2026-05-27 | $1680.00 | $816K | -3.2% | -18.5% | -18.9% |
| MPWR | SELL | 2026-05-05 | 2026-05-06 | $1607.85 | $2.4M | -7.9% | -8.5% | -17.3% |
| MPWR | SELL | 2025-08-27 | 2025-08-28 | $870.00 | $168K | +0.7% | +4.4% | +8.9% |
| MPWR | SELL | 2025-08-13 | 2025-08-15 | $850.00 | $340K | +5.2% | +3.2% | +12.2% |
| MPWR | SELL | 2025-08-12 | 2025-08-13 | $830.00 | $166K | -0.9% | -1.3% | +12.9% |
| MPWR | SELL | 2024-05-20 | 2024-05-22 | $750.00 | $150K | -6.4% | +6.5% | +16.6% |
| MPWR | SELL | 2024-02-12 | 2024-02-13 | $750.57 | $150K | +0.1% | -4.3% | -2.9% |
| MPWR | SELL | 2022-08-11 | 2022-08-12 | $540.00 | $108K | -5.8% | -15.3% | -26.7% |
| MPWR | SELL | 2022-08-03 | 2022-08-03 | $520.00 | $104K | +2.8% | -18.8% | -33.2% |
| MPWR | SELL | 2021-08-24 | 2021-08-26 | $490.00 | $147K | +1.1% | +4.6% | +13.5% |
| MPWR | SELL | 2021-08-20 | 2021-08-23 | $477.00 | $143K | +2.2% | +4.3% | +14.5% |
| MPWR | SELL | 2021-08-04 | 2021-08-05 | $465.22 | $186K | -1.2% | +8.5% | +17.6% |
| MPWR | SELL | 2021-07-23 | 2021-07-26 | $410.00 | $205K | +12.7% | +17.5% | +27.1% |
| MPWR | SELL | 2021-07-21 | 2021-07-21 | $402.51 | $403K | +12.5% | +17.9% | +22.8% |
| MPWR | SELL | 2021-07-14 | 2021-07-16 | $392.66 | $393K | +15.2% | +22.5% | +28.3% |
| MPWR | SELL | 2021-07-07 | 2021-07-08 | $387.27 | $194K | +4.9% | +22.9% | +24.8% |
| MPWR | SELL | 2021-07-06 | 2021-07-06 | $380.00 | $190K | -2.0% | +19.7% | +19.8% |
| MPWR | SELL | 2021-06-28 | 2021-06-28 | $369.27 | $554K | +2.3% | +15.3% | +36.2% |
| MPWR | SELL | 2021-02-12 | 2021-02-16 | $388.00 | $78K | -2.7% | -12.8% | -18.9% |
| MPWR | SELL | 2020-08-28 | 2020-09-01 | $266.89 | $158K | -10.4% | +1.5% | +15.8% |
| MPWR | SELL | 2020-08-05 | 2020-08-07 | $279.33 | $168K | -1.3% | -12.8% | +28.2% |
| MPWR | SELL | 2020-07-31 | 2020-08-04 | $272.17 | $136K | -0.5% | -5.1% | +13.8% |
| MPWR | SELL | 2020-05-12 | 2020-05-14 | $217.00 | $434K | +7.0% | +12.2% | +42.9% |
| MPWR | SELL | 2020-05-07 | 2020-05-11 | $205.00 | $121K | -4.1% | +8.9% | +28.9% |
| MPWR | SELL | 2020-05-05 | 2020-05-07 | $198.00 | $99K | -1.4% | +12.2% | +35.8% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.