David Michael Johnson is Director at Aura Biosciences, Inc. (AURA). They have made 12 open-market trades across 2 companies since 2020, most recently 2026-06-16.
CIK 0001808098
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.
9 open-market purchases totalling $2.4M since 2020, against 3 sales. Across 9 scored buys the stock is down 2.5% at ninety days, and 10.4 points behind the S&P over the same stretch.
9 scored purchases · one row per filing · discretionary only
| 7d | 30d | 90d | |
|---|---|---|---|
| Accuracy | 33% | 67% | 56% |
| Avg Move | -2.2% | +7.8% | -2.5% |
| Alpha | -4.1% | +4.5% | -10.4% |
| Scored | 9 | 9 | 9 |
| Ticker | Type | Traded | Filed | Price | Value | 7d Stock | 30d Stock | 90d Stock |
|---|---|---|---|---|---|---|---|---|
| AURA | BUY | 2025-05-16 | 2025-05-20 | $4.90 | $98K | -0.8% | -2.7% | +7.7% |
| ZNTL | BUY | 2023-11-10 | 2023-11-13 | $9.88 | $168K | -1.0% | +38.4% | +4.9% |
| AURA | BUY | 2023-11-07 | 2023-11-09 | $7.19 | $1.1M | +4.7% | +5.0% | +4.8% |
| AURA | BUY | 2023-10-03 | 2023-10-05 | $8.44 | $225K | -3.2% | +23.9% | +1.4% |
| AURA | BUY | 2023-01-05 | 2023-01-09 | $10.41 | $21K | -0.2% | +8.7% | -18.0% |
| AURA | BUY | 2022-12-28 | 2022-12-30 | $9.75 | $20K | +2.4% | -0.4% | -16.4% |
| AURA | BUY | 2022-12-01 | 2022-12-15 | $12.37 | $124K | -17.1% | -6.0% | -14.5% |
| AURA | BUY | 2022-06-10 | 2022-06-14 | $14.33 | $573K | -6.7% | +1.4% | +23.6% |
| ZNTL | SELL | 2021-10-04 | 2021-10-04 | $66.34 | $1.7M | +16.4% | +26.7% | +20.8% |
| ZNTL | SELL | 2021-04-05 | 2021-04-05 | $43.50 | $1.1M | +15.6% | +31.8% | +7.6% |
| ZNTL | SELL | 2020-12-02 | 2020-12-03 | $51.34 | $1.1M | +2.3% | +1.8% | -15.8% |
| ZNTL | BUY | 2020-04-07 | 2020-12-03 | $18.00 | $72K | +2.3% | +1.8% | -15.8% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.