Chenming Hu is Director at AMBARELLA INC (AMBA). They have made 18 open-market trades across 4 companies since 2011, most recently 2026-09-08.
CIK 0001316320
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.
2 open-market purchases totalling $298K since 2011, against 16 sales. Too few scored purchases to measure a record yet.
| Ticker | Type | Traded | Filed | Price | Value | 7d Stock | 30d Stock | 90d Stock |
|---|---|---|---|---|---|---|---|---|
| ACMR | SELL · 10b5-1 | 2025-03-17 | 2025-03-19 | $30.00 | $4.9M | -17.9% | -35.3% | -11.4% |
| AMBA | SELL | 2021-09-22 | 2021-09-24 | $160.00 | $587K | -6.6% | +11.9% | +24.8% |
| AMBA | SELL | 2021-09-09 | 2021-09-10 | $140.00 | $560K | +10.2% | +1.0% | +39.4% |
| AMBA | SELL | 2021-09-01 | 2021-09-02 | $120.00 | $480K | +15.3% | +12.4% | +54.7% |
| ACMR | SELL | 2021-02-12 | 2021-02-16 | $120.00 | $1.2M | -28.5% | -34.1% | -52.7% |
| AMBA | SELL | 2020-12-03 | 2020-12-04 | $88.00 | $512K | -4.8% | -3.3% | +18.1% |
| AMBA | SELL | 2020-11-27 | 2020-12-02 | $78.00 | $390K | +7.3% | +7.9% | +34.4% |
| AMBA | SELL | 2020-11-24 | 2020-11-25 | $70.67 | $353K | +17.7% | +25.5% | +54.2% |
| ACMR | SELL | 2020-08-03 | 2020-08-05 | $100.00 | $781K | +1.8% | -21.7% | -23.7% |
| ACMR | SELL | 2020-07-13 | 2020-07-15 | $84.15 | $1.2M | +12.1% | +39.1% | +3.7% |
| ACMR | SELL | 2020-06-03 | 2020-06-05 | $65.12 | $1.1M | -1.0% | +30.4% | +35.5% |
| IPHI | SELL | 2019-11-25 | 2019-11-26 | $71.00 | $497K | -2.9% | +7.1% | +9.9% |
| AMBA | SELL | 2019-09-30 | 2019-10-01 | $63.00 | $630K | -7.6% | -9.2% | +4.4% |
| AMBA | SELL | 2015-06-09 | 2015-06-10 | $110.44 | $1.7M | -18.1% | -0.6% | -0.6% |
| SNDK | SELL | 2013-11-18 | 2013-11-19 | $69.44 | $1.6M | +37.4% | +2.7% | +2.7% |
| SNDK | SELL | 2013-08-13 | 2013-08-15 | $58.00 | $696K | +37.4% | +2.7% | +2.7% |
| SNDK | SELL | 2013-02-05 | 2013-02-05 | $49.72 | $597K | +37.4% | +2.7% | +2.7% |
| IPHI | BUY | 2011-08-10 | 2011-08-15 | $8.50 | $99K | -5.1% | -0.5% | -0.5% |
| IPHI | BUY | 2011-08-09 | 2011-08-11 | $8.65 | $198K | -5.1% | -0.5% | -0.5% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.