Douglas Kerr is CHIEF MEDICAL OFFICER at Generation Bio Co. (GBIO). They have made 4 open-market trades across 1 company since 2021, most recently 2026-09-08.
CIK 0001814189
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 4 sales. Too few scored purchases to measure a record yet.
| Ticker | Type | Traded | Filed | Price | Value | 7d Stock | 30d Stock | 90d Stock |
|---|---|---|---|---|---|---|---|---|
| DYN | SELL · 10b5-1 | 2026-09-04 | 2026-09-08 | $22.95 | $116K | -11.4% | -15.3% | — |
| DYN | SELL · 10b5-1 | 2026-08-13 | 2026-08-17 | $26.28 | $41K | +0.0% | -33.6% | — |
| DYN | SELL · 10b5-1 | 2026-06-16 | 2026-06-17 | $18.33 | $16K | +9.0% | +16.5% | -12.0% |
| DYN | SELL · 10b5-1 | 2026-05-13 | 2026-05-14 | $18.36 | $29K | +1.7% | +5.2% | +46.7% |
| DYN | SELL · 10b5-1 | 2026-03-05 | 2026-03-06 | $14.90 | $13K | +19.8% | +20.2% | +20.5% |
| DYN | SELL · 10b5-1 | 2025-12-05 | 2025-12-05 | $20.72 | $18K | -12.5% | -15.6% | -29.6% |
| DYN | SELL · 10b5-1 | 2025-09-04 | 2025-09-08 | $13.30 | $59K | +5.0% | +9.8% | +67.4% |
| DYN | SELL · 10b5-1 | 2025-06-05 | 2025-06-06 | $13.35 | $18K | -29.1% | -46.2% | -12.9% |
| DYN | SELL · 10b5-1 | 2025-03-05 | 2025-03-07 | $11.83 | $16K | +2.1% | -38.4% | +15.1% |
| GBIO | SELL · 10b5-1 | 2021-07-08 | 2021-07-12 | $25.20 | $89K | -10.9% | +1.1% | -5.7% |
| GBIO | SELL | 2021-04-05 | 2021-04-07 | $30.09 | $847K | +0.9% | +13.2% | -10.5% |
| GBIO | SELL | 2021-03-05 | 2021-03-09 | $31.29 | $571K | -4.5% | -19.8% | -21.6% |
| GBIO | SELL | 2021-02-08 | 2021-02-10 | $33.37 | $752K | -3.7% | -2.9% | -13.8% |
| GBIO | SELL | 2021-01-11 | 2021-01-13 | $27.57 | $613K | -5.0% | +10.4% | -15.4% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.