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 6 of 8
72 filingsForm 4 transactions across all companies, newest first.
| Filed | Symbol | Action | Net Shares | Net $ | Link |
|---|---|---|---|---|---|
| 2013-02-26 | BIIB | Mixed | +1,371 | -$201.7K | EDGAR |
| 2013-02-14 | BIIB | Grant (A) | — | $0 | EDGAR |
| 2013-02-12 | BIIB | Mixed | +5,210 | -$488.2K | EDGAR |
| 2012-05-04 | BIIB | Tax (F) | −765 | -$102.7K | EDGAR |
| 2012-02-27 | BIIB | Mixed | −63 | -$310.3K | EDGAR |
| 2012-02-13 | BIIB | Mixed | +3,188 | -$177.1K | EDGAR |
| 2012-02-10 | BIIB | Grant (A) | — | $0 | EDGAR |
| 2011-11-03 | BIIB | Mixed | — | -$90.3K | EDGAR |
| 2011-05-04 | BIIB | Tax (F) | −765 | -$75.0K | EDGAR |
| 2011-04-25 | BIIB | Mixed | — | -$118.0K | 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.