Bruce Booth
CIK 1451612 · last filed 2026-04-24
Bruce Booth is a corporate insider who has filed 77 SEC Form 4 insider transactions across 8 companies since 2015. The most recent filing, for KYMR, was dated Apr 24, 2026. Across all open-market trades the lifetime net is −$112.3M, making them a net seller over the disclosed history. Current disclosed insider exposure totals $143.5M across reported positions.
"Disclosed insider exposure" sums this person's most-recently-reported share counts across each company they're an insider in, multiplied by the current underlying price. It is not net worth — it misses retail holdings, private investments, real estate, index funds, and any company where the person isn't an SEC-reporting insider. For informational purposes only.
$143.47M
8
77
-$112.33M
Holdings By Company
| Symbol | Role | Shares | Price | Disclosed Exposure | Lifetime OM Net | Filings | Latest Filed |
|---|---|---|---|---|---|---|---|
| KYMR | Director | 680,844 | $86.20 | $58.69M | -$127.69M | 21 | 2026-04-24 |
| SION | Director | 2,360,156 | $35.92 | $84.78M | -$21.01M | 7 | 2025-10-21 |
| Vigil Neuroscience, Inc. (VIGL) Delisted | Director | 0 | $8.05 | $0 | $7.49M | 11 | 2025-08-05 |
| Tectonic Therapeutic, Inc. (AVRO) Delisted | Director | 5,567,289 | $16.80 | $93.53M | $15.00M | 7 | 2023-06-08 |
| Dianthus Therapeutics, Inc. /DE/ (MGTA) Delisted | Director | 4,117,125 | $11.19 | $46.09M | $9.75M | 7 | 2022-06-30 |
| Cogent Biosciences, Inc. (UMRX) Delisted | Director | 3,184,446 | — | — | $1.13M | 12 | 2020-07-06 |
| Viridian Therapeutics, Inc.\DE (MGEN) Delisted | Director | 3,142,580 | — | — | $3.00M | 5 | 2018-06-28 |
| Larimar Therapeutics, Inc. (ZFGN) Delisted | Director | 4,638,028 | — | — | $0 | 7 | 2018-01-05 |
Recent Filings
77 filings| Filed | Symbol | Action | Net Shares | Net $ | Link |
|---|---|---|---|---|---|
| 2026-04-24 | KYMR | Mixed | −100 | -$454.6K | EDGAR |
| 2026-04-16 | KYMR | Mixed | −3,135 | -$764.4K | EDGAR |
| 2026-03-04 | KYMR | Sell (S) | −81,866 | -$7.38M | EDGAR |
| 2025-12-12 | KYMR | Sell (S) | −236,588 | -$21.70M | EDGAR |
| 2025-10-21 | SION | Sell (S) | −88,878 | -$3.04M | EDGAR |
| 2025-10-20 | SION | Sell (S) | −286,369 | -$9.25M | EDGAR |
| 2025-10-15 | SION | Sell (S) | −194,932 | -$5.94M | EDGAR |
| 2025-10-07 | SION | Sell (S) | −49,546 | -$1.49M | EDGAR |
| 2025-10-01 | SION | Sell (S) | −78,693 | -$2.37M | EDGAR |
| 2025-08-05 | Vigil Neuroscience, Inc. (VIGL) Delisted | Disp (D) | −5,841,874 | $0 | EDGAR |