Bruce Booth
CIK 1451612 · last filed 2026-07-02
Bruce Booth is a corporate insider who has filed 86 SEC Form 4 insider transactions across 8 companies since 2015. The most recent filing shows the insider sold $8.3M of KYMR on Jul 2, 2026. Across all open-market trades the lifetime net is −$248.0M, making them a net seller over the disclosed history. Current disclosed insider exposure totals $71.9M 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.
$71.89M
8
86
-$248.00M
Holdings By Company
| Symbol | Role | Shares | Price | Disclosed Exposure | Lifetime OM Net | Filings | Latest Filed |
|---|---|---|---|---|---|---|---|
| KYMR | Director | 475,805 | $119.05 | $56.64M | -$263.36M | 27 | 2026-07-02 |
| SION | Director | 2,360,156 | $6.46 | $15.25M | -$21.01M | 8 | 2026-06-18 |
| Vigil Neuroscience, Inc. (VIGL) Delisted | Director | 0 | $8.05 | $0 | $7.49M | 11 | 2025-08-05 |
| Tectonic Therapeutic, Inc. (AVRO) Delisted | Director | 463,941 | $16.80 | $7.79M | $15.00M | 7 | 2023-06-08 |
| Dianthus Therapeutics, Inc. /DE/ (MGTA) Delisted | Director | 257,320 | $11.19 | $2.88M | $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 | 209,505 | — | — | $3.00M | 5 | 2018-06-28 |
| Larimar Therapeutics, Inc. (ZFGN) Delisted | Director | 386,502 | — | — | $0 | 7 | 2018-01-05 |
Recent Filings
86 filings| Filed | Symbol | Action | Net Shares | Net $ | Link |
|---|---|---|---|---|---|
| 2026-07-02 | KYMR | Sell (S) | −76,650 | -$8.28M | EDGAR |
| 2026-06-25 | KYMR | Sell (S) | −285,684 | -$34.81M | EDGAR |
| 2026-06-25 | KYMR | Sell (S) | −398,765 | -$43.99M | EDGAR |
| 2026-06-25 | KYMR | Grant (A) | — | $0 | EDGAR |
| 2026-06-22 | KYMR | Sell (S) | −31,798 | -$3.30M | EDGAR |
| 2026-06-22 | KYMR | Mixed | −466,457 | -$45.06M | EDGAR |
| 2026-06-18 | SION | Grant (A) | — | $0 | EDGAR |
| 2026-06-17 | KYMR | Notice (144) | −11,741 | -$1.03M | EDGAR |
| 2026-04-24 | KYMR | Mixed | −100 | -$454.6K | EDGAR |
| 2026-04-16 | KYMR | Mixed | −3,135 | -$764.4K | EDGAR |
Notice (144 / 144/A): Form 144 is a notice of intent to sell restricted/control stock under Rule 144, filed before the sale; 144/A is an amendment. Many notices are pre-scheduled under Rule 10b5-1 plans. A Form 4 with code S typically follows within a few days when the planned sale executes; missing follow-up Form 4s suggest the notice was cancelled or modified.