Yun-Lung Chen is VP at AMBARELLA INC (AMBA). They have made 23 open-market trades across 1 company since 2015, most recently 2026-07-09.
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 23 sales. Too few scored purchases to measure a record yet.
| Ticker | Shares | Value |
|---|---|---|
| AMBA | 60,557 | $3.7M |
Shares reported on the most recent Form 4, priced at the 2026-07-10 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 | 2026-07-09 | 2026-07-10 | $78.66 | $469K | -5.2% | +12.7% | -13.6% |
| AMBA | SELL | 2026-06-12 | 2026-06-16 | $67.06 | $661K | -1.4% | -7.0% | -5.9% |
| AMBA | SELL | 2025-09-10 | 2025-09-12 | $84.42 | $1.4M | +5.1% | +0.5% | -1.8% |
| AMBA | SELL | 2024-09-03 | 2024-09-05 | $57.56 | $686K | +1.5% | +4.2% | +32.8% |
| AMBA | SELL | 2023-06-05 | 2023-06-06 | $76.80 | $1.4M | +7.4% | +0.5% | -19.9% |
| AMBA | SELL | 2022-03-29 | 2022-03-31 | $104.22 | $834K | -15.9% | -19.5% | -35.3% |
| AMBA | SELL | 2022-03-03 | 2022-03-04 | $96.78 | $2.4M | +7.2% | +19.0% | +0.0% |
| AMBA | SELL | 2021-12-03 | 2021-12-07 | $198.32 | $2.4M | -16.5% | -22.0% | -60.8% |
| AMBA | SELL | 2021-06-28 | 2021-06-30 | $104.09 | $1.2M | -6.1% | -7.6% | +45.6% |
| AMBA | SELL | 2021-03-12 | 2021-03-16 | $112.12 | $1.9M | -9.2% | -3.8% | -2.6% |
| AMBA | SELL | 2020-12-09 | 2020-12-11 | $89.16 | $1.1M | +4.0% | +18.0% | +31.8% |
| AMBA | SELL | 2020-06-05 | 2020-06-08 | $55.82 | $620K | -5.7% | -10.0% | -10.8% |
| AMBA | SELL | 2019-09-09 | 2019-09-11 | $64.80 | $743K | -1.7% | -18.5% | -20.1% |
| AMBA | SELL | 2019-03-08 | 2019-03-11 | $41.28 | $522K | +1.5% | +4.9% | -5.2% |
| AMBA | SELL | 2017-12-29 | 2018-01-03 | $59.80 | $265K | -17.4% | -25.9% | -27.7% |
| AMBA | SELL | 2017-12-11 | 2017-12-13 | $59.80 | $678K | +2.0% | -6.4% | -9.5% |
| AMBA | SELL | 2017-03-13 | 2017-03-14 | $55.16 | $871K | -3.1% | -10.2% | -10.0% |
| AMBA | SELL | 2016-09-30 | 2016-10-03 | $74.19 | $623K | -14.7% | -23.3% | -29.1% |
| AMBA | SELL | 2015-09-17 | 2015-09-21 | $73.93 | $424K | -18.1% | -0.6% | -0.6% |
| AMBA | SELL | 2015-09-14 | 2015-09-16 | $68.80 | $572K | -18.1% | -0.6% | -0.6% |
| AMBA | SELL | 2015-09-04 | 2015-09-09 | $70.25 | $458K | -18.1% | -0.6% | -0.6% |
| AMBA | SELL | 2015-06-18 | 2015-06-18 | $125.04 | $206K | -18.1% | -0.6% | -0.6% |
| AMBA | SELL | 2015-03-06 | 2015-03-10 | $63.43 | $744K | -18.1% | -0.6% | -0.6% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.