Kuo Wei Herbert Chang is Director at MONOLITHIC POWER SYSTEMS, INC. (MPWR). They have made 98 open-market trades across 2 companies since 2006, most recently 2026-08-24.
CIK 0001192171
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 98 sales. Too few scored purchases to measure a record yet.
| Ticker | Shares | Value |
|---|---|---|
| MRVL | 12,000 | $2.7M |
| MPWR | 515 | $623K |
| Total | $3.4M |
Shares reported on the most recent Form 4, priced at the 2026-08-25 close.
Counted per filing, not per execution lot — a purchase filled in several tranches is one decision.
| 7d | 30d | 90d | |
|---|---|---|---|
| Accuracy | 100% | 100% | 100% |
| Avg Move | -6.8% | -2.4% | -2.4% |
| Scored | 12 | 12 | 12 |
| Ticker | Type | Traded | Filed | Price | Value | 7d Stock | 30d Stock | 90d Stock |
|---|---|---|---|---|---|---|---|---|
| MPWR | SELL | 2026-08-24 | 2026-08-25 | $1281.57 | $64K | -5.9% | +2.9% | — |
| MPWR | SELL | 2026-08-11 | 2026-08-13 | $1420.00 | $71K | -4.3% | -16.1% | — |
| MPWR | SELL | 2025-11-25 | 2025-11-25 | $896.97 | $90K | +6.9% | +2.8% | +29.3% |
| MPWR | SELL | 2025-11-21 | 2025-11-24 | $873.97 | $87K | +9.0% | +7.9% | +34.7% |
| MPWR | SELL | 2025-05-13 | 2025-05-13 | $738.00 | $37K | -10.2% | -2.5% | +8.2% |
| MPWR | SELL | 2025-05-12 | 2025-05-12 | $698.00 | $70K | -4.8% | +2.1% | +13.0% |
| MPWR | SELL | 2025-05-08 | 2025-05-09 | $650.00 | $65K | -2.2% | +1.8% | +15.0% |
| MPWR | SELL | 2024-08-15 | 2024-08-15 | $893.44 | $179K | +4.8% | -1.9% | -33.3% |
| MPWR | SELL | 2024-05-20 | 2024-05-22 | $750.00 | $150K | -6.4% | +6.5% | +16.6% |
| MPWR | SELL | 2024-05-15 | 2024-05-15 | $735.00 | $147K | +2.9% | +9.2% | +17.5% |
| MPWR | SELL | 2024-02-29 | 2024-02-29 | $706.34 | $177K | +1.3% | -8.0% | +2.7% |
| MPWR | SELL | 2024-02-22 | 2024-02-23 | $750.00 | $188K | +0.3% | -8.2% | +2.3% |
| MPWR | SELL | 2023-11-14 | 2023-11-15 | $523.64 | $209K | +0.4% | +17.0% | +31.5% |
| MPWR | SELL | 2023-11-13 | 2023-11-13 | $510.00 | $51K | +4.9% | +16.2% | +39.4% |
| MPWR | SELL | 2023-08-29 | 2023-08-29 | $500.00 | $250K | -4.5% | -11.3% | +7.3% |
| MPWR | SELL | 2021-02-26 | 2021-02-26 | $370.00 | $111K | -15.1% | -10.6% | -10.1% |
| MPWR | SELL | 2020-11-04 | 2020-11-05 | $326.33 | $979K | -15.0% | -9.5% | +2.7% |
| MPWR | SELL | 2020-08-28 | 2020-09-01 | $268.00 | $348K | -10.4% | +1.5% | +15.8% |
| MPWR | SELL | 2020-08-12 | 2020-08-14 | $279.50 | $112K | -3.5% | -11.3% | +11.3% |
| MPWR | SELL | 2020-08-06 | 2020-08-10 | $280.43 | $196K | +0.4% | -8.6% | +17.5% |
| MPWR | SELL | 2020-08-03 | 2020-08-05 | $273.25 | $479K | +1.5% | -7.7% | +13.4% |
| MPWR | SELL | 2020-05-08 | 2020-05-12 | $210.64 | $637K | -3.5% | +0.7% | +29.9% |
| MPWR | SELL | 2020-05-05 | 2020-05-07 | $198.00 | $198K | -1.4% | +12.2% | +35.8% |
| MPWR | SELL | 2020-02-13 | 2020-02-14 | $192.00 | $192K | -16.3% | -27.6% | +7.0% |
| MPWR | SELL | 2020-02-11 | 2020-02-12 | $187.72 | $188K | -12.7% | -9.5% | +11.2% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.