John Cox
CIK 1498428 · CEO & President · last filed 2026-05-14
John Cox is a CEO & President who has filed 72 SEC Form 4 insider transactions across 5 companies since 2010. The most recent filing shows the insider sold $60.8K of DYN on May 14, 2026. Across all open-market trades the lifetime net is −$13.1M, making them a net seller over the disclosed history. Current disclosed insider exposure totals $15.0M 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.
$15.00M
5
72
-$13.06M
Holdings By Company
| Symbol | Role | Shares | Price | Disclosed Exposure | Lifetime OM Net | Filings | Latest Filed |
|---|---|---|---|---|---|---|---|
| DYN | CEO & President | 388,834 | $18.19 | $7.07M | $1.67M | 12 | 2026-05-14 |
| Sigilon Therapeutics, Inc. (SGTX) Delisted | Director | 4,444 | $22.47 | $99.9K | $0 | 5 | 2023-08-11 |
| RGEN | Director | 923 | $130.59 | $120.5K | -$4.07M | 10 | 2020-03-26 |
| Bioverativ Inc. (BIVV) Delisted | Chief Executive Officer | 0 | — | — | $0 | 9 | 2018-03-08 |
| BIIB | EVP Pharmaceutical Oper & Tech | 39,045 | $200.05 | $7.81M | -$10.66M | 36 | 2016-04-05 |
Recent Filings
72 filings| Filed | Symbol | Action | Net Shares | Net $ | Link |
|---|---|---|---|---|---|
| 2026-05-14 | DYN | Sell (S) | −3,311 | -$60.8K | EDGAR |
| 2026-03-06 | DYN | Sell (S) | −2,732 | -$40.7K | EDGAR |
| 2026-02-17 | DYN | Grant (A) | +180,000 | $0 | EDGAR |
| 2025-12-05 | DYN | Sell (S) | −2,662 | -$55.2K | EDGAR |
| 2025-09-09 | DYN | Sell (S) | −2,640 | -$35.4K | EDGAR |
| 2025-07-18 | DYN | Grant (A) | — | $0 | EDGAR |
| 2025-07-15 | DYN | Mixed | +60,000 | $911.0K | EDGAR |
| 2025-06-06 | DYN | Sell (S) | −4,060 | -$54.2K | EDGAR |
| 2025-03-07 | DYN | Sell (S) | −4,061 | -$48.0K | EDGAR |
| 2024-12-06 | DYN | Grant (A) | +145,300 | $0 | EDGAR |