Chi-Hong Ju is President & VP at AMBARELLA INC (AMBA). They have made 39 open-market trades across 1 company since 2021, most recently 2026-09-17.
CIK 0001882831
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 39 sales. Too few scored purchases to measure a record yet.
| Ticker | Shares | Value |
|---|---|---|
| AMBA | 154,153 | $9.5M |
Shares reported on the most recent Form 4, priced at the 2026-09-18 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 |
|---|---|---|---|---|---|---|---|---|
| AMBA | SELL | 2026-09-17 | 2026-09-18 | $64.83 | $130K | +3.6% | — | — |
| AMBA | SELL | 2026-07-01 | 2026-07-02 | $88.84 | $888K | -17.2% | -0.6% | -16.2% |
| AMBA | SELL | 2026-06-17 | 2026-06-18 | $67.87 | $137K | +23.7% | -7.9% | -12.1% |
| AMBA | SELL | 2026-03-17 | 2026-03-19 | $53.20 | $366K | -7.8% | +6.1% | +18.0% |
| AMBA | SELL | 2026-01-05 | 2026-01-07 | $75.58 | $584K | -6.1% | -9.1% | -27.2% |
| AMBA | SELL | 2025-12-30 | 2025-12-31 | $70.32 | $530K | -9.9% | -12.1% | -29.3% |
| AMBA | SELL | 2025-12-30 | 2026-01-23 | $70.25 | $558K | -9.0% | +0.5% | -8.1% |
| AMBA | SELL | 2025-12-17 | 2025-12-19 | $71.82 | $193K | +2.3% | -10.6% | -24.0% |
| AMBA | SELL | 2025-10-13 | 2025-10-15 | $81.11 | $1.8M | +1.4% | +3.0% | -23.1% |
| AMBA | SELL | 2025-09-17 | 2025-09-19 | $79.43 | $186K | +2.1% | +1.4% | -15.5% |
| AMBA | SELL | 2025-06-17 | 2025-06-20 | $52.26 | $116K | +28.9% | +35.9% | +61.0% |
| AMBA | SELL | 2025-03-18 | 2025-03-20 | $55.02 | $114K | -5.3% | -22.2% | -0.8% |
| AMBA | SELL | 2025-03-06 | 2025-03-07 | $55.11 | $205K | +6.6% | -19.4% | -0.0% |
| AMBA | SELL | 2024-12-16 | 2024-12-18 | $75.41 | $158K | +4.1% | +15.7% | -23.0% |
| AMBA | SELL | 2024-12-09 | 2024-12-10 | $75.70 | $548K | -3.5% | +3.0% | -33.4% |
| AMBA | SELL | 2024-09-17 | 2024-09-19 | $53.54 | $56K | -1.3% | +4.3% | +27.0% |
| AMBA | SELL | 2024-06-26 | 2024-06-27 | $52.90 | $317K | +12.0% | -2.2% | -0.1% |
| AMBA | SELL | 2024-06-21 | 2024-06-24 | $55.53 | $494K | +7.1% | +0.7% | -0.2% |
| AMBA | SELL | 2024-06-18 | 2024-06-20 | $55.48 | $118K | +0.5% | +4.2% | -3.4% |
| AMBA | SELL | 2024-06-07 | 2024-06-11 | $57.11 | $479K | -6.2% | +5.9% | -11.1% |
| AMBA | SELL | 2024-03-18 | 2024-03-20 | $49.27 | $38K | -5.5% | -20.9% | +6.4% |
| AMBA | SELL | 2024-03-08 | 2024-03-11 | $57.16 | $29K | -9.0% | -14.1% | +3.7% |
| AMBA | SELL | 2023-12-19 | 2023-12-21 | $63.04 | $135K | -13.6% | -9.7% | -19.6% |
| AMBA | SELL | 2023-09-18 | 2023-09-20 | $57.30 | $120K | -2.1% | -7.2% | +17.4% |
| AMBA | SELL | 2023-07-07 | 2023-07-10 | $81.81 | $696K | -2.7% | -9.8% | -34.7% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.