George Bickerstaff is Director at CareDx, Inc. (CDNA). They have made 13 open-market trades across 4 companies since 2007, most recently 2026-08-05.
CIK 0001329646
6 open-market purchases totalling $881K since 2007, against 7 sales. Across 5 scored buys the stock is up 11.7% at ninety days, and 10.6 points ahead of the S&P over the same stretch.
5 scored purchases · one row per filing · discretionary only
| 7d | 30d | 90d | |
|---|---|---|---|
| Accuracy | 40% | 60% | 40% |
| Avg Move | -1.2% | +0.8% | +11.7% |
| Alpha | -2.1% | +0.4% | +10.6% |
| Scored | 5 | 5 | 5 |
| Ticker | Type | Traded | Filed | Price | Value | 7d Stock | 30d Stock | 90d Stock |
|---|---|---|---|---|---|---|---|---|
| CDNA | SELL | 2026-08-05 | 2026-08-06 | $46.29 | $926K | +3.0% | +12.1% | — |
| CDNA | SELL | 2025-03-10 | 2025-03-12 | $18.36 | $367K | +4.4% | +0.2% | +5.7% |
| CDNA | SELL | 2022-02-28 | 2022-03-01 | $39.11 | $978K | -19.3% | -3.0% | -34.0% |
| INVA | BUY | 2021-05-21 | 2021-05-25 | $13.22 | $264K | -3.8% | +1.4% | +17.9% |
| CDNA | SELL | 2021-05-21 | 2021-05-21 | $75.34 | $1.5M | +6.2% | +21.9% | -5.7% |
| CDNA | SELL | 2021-05-12 | 2021-05-13 | $63.07 | $631K | +28.3% | +43.9% | +16.5% |
| CDNA | SELL | 2020-12-14 | 2020-12-14 | $71.97 | $1.1M | +10.1% | +21.8% | +6.3% |
| CDNA | SELL | 2020-05-13 | 2020-05-13 | $27.65 | $277K | +13.2% | +18.2% | +15.9% |
| INVA | BUY | 2019-02-27 | 2019-02-28 | $15.90 | $239K | -9.5% | -11.2% | -10.9% |
| INVA | BUY | 2019-02-21 | 2019-02-22 | $14.90 | $149K | -5.6% | -9.9% | -5.5% |
| AXON | BUY | 2018-08-09 | 2018-08-13 | $2.07 | $104K | +4.8% | +15.2% | -18.2% |
| AXON | BUY | 2018-02-27 | 2018-03-01 | $1.50 | $38K | +8.2% | +8.6% | +75.3% |
| VION | BUY | 2007-03-12 | 2007-03-14 | $1.76 | $88K | N/A | N/A | N/A |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.
Counted per filing, not per execution lot — a purchase filled in several tranches is one decision.