Carsten Brunn is CEO & President at SELECTA BIOSCIENCES INC (SELB). They have made 19 open-market trades across 2 companies since 2019, most recently 2026-01-06.
CIK 0001760229
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 19 sales. Too few scored purchases to measure a record yet.
| Ticker | Shares | Value |
|---|---|---|
| RNAC | 323,530 | $2.0M |
| SELB | 783,081 | $690K |
| Total | $2.7M |
Shares reported on the most recent Form 4, priced at the 2026-01-08 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 |
|---|---|---|---|---|---|---|---|---|
| RNAC | SELL | 2026-01-06 | 2026-01-08 | $6.82 | $162K | -5.3% | -19.5% | -23.8% |
| RNAC | SELL | 2025-01-03 | 2025-01-07 | $16.78 | $579K | +17.5% | +11.4% | -40.1% |
| SELB | SELL | 2023-09-25 | 2023-09-26 | $1.06 | $3K | -9.7% | +5.3% | N/A |
| SELB | SELL | 2023-01-04 | 2023-01-06 | $1.13 | $46K | +20.7% | +35.6% | -3.0% |
| SELB | SELL | 2022-12-05 | 2022-12-07 | $1.33 | $6K | -14.1% | -3.9% | +18.8% |
| SELB | SELL | 2022-09-28 | 2022-09-30 | $1.66 | $4K | -2.4% | -5.4% | -32.3% |
| SELB | SELL | 2022-09-02 | 2022-09-06 | $1.85 | $9K | +6.4% | +1.2% | -24.3% |
| SELB | SELL | 2022-03-02 | 2022-03-03 | $1.81 | $10K | -14.1% | -19.4% | -50.5% |
| SELB | SELL | 2022-01-05 | 2022-01-07 | $3.09 | $42K | -14.4% | -21.9% | -54.1% |
| SELB | SELL | 2021-12-02 | 2021-12-03 | $2.96 | $14K | +13.2% | +17.8% | -38.4% |
| SELB | SELL | 2021-10-13 | 2021-10-15 | $4.39 | $134K | -13.8% | -14.0% | -33.7% |
| SELB | SELL | 2021-09-02 | 2021-09-03 | $4.51 | $20K | -7.5% | -6.2% | -32.6% |
| SELB | SELL | 2021-06-02 | 2021-06-03 | $4.38 | $21K | +11.9% | -6.3% | -2.5% |
| SELB | SELL | 2021-03-02 | 2021-03-03 | $4.26 | $23K | +13.5% | +10.7% | +12.0% |
| SELB | SELL | 2020-12-02 | 2020-12-03 | $3.35 | $11K | -6.3% | -7.5% | +25.0% |
| SELB | SELL | 2020-09-02 | 2020-09-03 | $2.39 | $8K | +15.4% | -27.3% | +50.0% |
| SELB | SELL | 2020-06-02 | 2020-06-03 | $3.86 | $13K | -37.4% | -31.7% | -38.9% |
| SELB | SELL | 2020-03-03 | 2020-03-03 | $3.86 | $13K | -33.1% | -53.1% | -4.7% |
| SELB | SELL | 2019-12-02 | 2019-12-03 | $1.53 | $22K | -0.6% | +48.4% | +151.0% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.