John Cox
CIK 1498428 · CEO & President · last filed 2026-05-14
"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.
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Disclosed Exposure
$15.00M
Companies
5
Total Filings
72
Lifetime Open-Market Net
-$13.06M
Holdings By Company
Latest on-record share count from this person's most recent non-derivative Form 4 transaction in each company. Disclosed exposure = shares × current underlying price.
| 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 · Page 4 of 8
72 filingsForm 4 transactions across all companies, newest first.
| Filed | Symbol | Action | Net Shares | Net $ | Link |
|---|---|---|---|---|---|
| 2017-03-27 | Bioverativ Inc. (BIVV) Delisted | Grant (A) | — | $0 | EDGAR |
| 2017-03-02 | Bioverativ Inc. (BIVV) Delisted | Mixed | +173,748 | -$1.75M | EDGAR |
| 2017-02-16 | Bioverativ Inc. (BIVV) Delisted | Grant (A) | — | $0 | EDGAR |
| 2016-05-13 | RGEN | Grant (A) | +1,763 | $0 | EDGAR |
| 2016-04-05 | BIIB | Grant (A) | +8,444 | $0 | EDGAR |
| 2016-02-25 | BIIB | Mixed | +428 | -$98.9K | EDGAR |
| 2016-02-24 | BIIB | Grant (A) | — | $0 | EDGAR |
| 2016-02-17 | BIIB | Mixed | +1,746 | -$383.7K | EDGAR |
| 2016-02-09 | BIIB | Mixed | +2,702 | -$332.0K | EDGAR |
| 2015-05-26 | RGEN | Grant (A) | +1,858 | $0 | EDGAR |
Codes: P = open-market purchase · S = open-market sale · A = grant/award · M = option exercise · F = tax withholding at vest · G = bona-fide gift · D = disposition to issuer · J = other (see filing footnote). Only P / S codes carry directional signal.