Cox John
Director · Officer · DYN
As of 2026-09-16, Cox John has 19 Form 4 transactions on record across 1 company — 8 in the trailing 12 months.
Everything this person has disclosed to the SEC on Form 4 — across every company they file for — reconstructed from the public record. A filing history, not a tip sheet.
Pattern in the record: open-market sales filed in September in multiple years since 2025 — a recurring calendar cadence, more consistent with scheduled activity than a one-off decision.
Reconstructed holdings
- Direct $6.2M
- Indirect $0
| DYN | direct | 357,507 sh | $6.2M |
Reconstructed from this person's own Form 4 filings — the total each filing reported owning afterward, priced at the close on the as-of date shown. A filed position can lag the real one.
Direct and indirect holdings (e.g. through a trust or fund) are tagged separately, as filed.
Trades by company
Filing ledger
| Date | Company | Action | Shares @ price | Value | Ownership Δ | Owned after | Filing |
|---|---|---|---|---|---|---|---|
| 2026-09-08 | DYN | Sale | 5,658 @ $18.88 | $107K | −1.6% of holding | 357,507 | Form 4 |
| 2026-08-13 | DYN | Sale | 4,986 @ $26.28 | $131K | −1.4% of holding | 363,165 | Form 4 |
| 2026-06-16 | DYN | Sale | 2,683 @ $18.33 | $49K | −0.7% of holding | 368,151 | Form 4 |
| 2026-05-13 | DYN | Sale | 3,311 @ $18.36 | $61K | −0.9% of holding | 370,834 | Form 4 |
| 2026-03-05 | DYN | Sale | 2,732 @ $14.90 | $41K | −0.7% of holding | 374,145 | Form 4 |
| 2025-12-05 | DYN | Sale | 2,662 @ $20.72 | $55K | −1.3% of holding | 196,877 | Form 4 |
| 2025-09-05 | DYN | Sale | 2,640 @ $13.41 | $35K | −1.3% of holding | 199,539 | Form 4 |
| 2025-07-14 | DYN | Purchase | 100,000 @ $9.11 | $911K | +70.3% of holding | 242,179 | Form 4 |
| 2025-06-05 | DYN | Sale | 4,060 @ $13.35 | $54K | −2.8% of holding | 142,179 | Form 4 |
| 2025-03-05 | DYN | Sale | 4,061 @ $11.83 | $48K | −2.7% of holding | 146,239 | Form 4 |
9 award / exercise / gift records — not counted as purchases
| Date | Company | Action | Shares | Owned after | Filing |
|---|---|---|---|---|---|
| 2026-02-12 | DYN | Award / grant | 180,000 | 376,877 | Form 4 |
| 2026-02-12 | DYN | Award / grant | 285,000 | 285,000 | Form 4 |
| 2025-07-16 | DYN | Award / grant | 197,285 | 197,285 | Form 4 |
| 2025-07-15 | DYN | Gift | 10,000 | 222,179 | Form 4 |
| 2025-07-15 | DYN | Gift | 10,000 | 202,179 | Form 4 |
| 2025-07-15 | DYN | Gift | 10,000 | 212,179 | Form 4 |
| 2025-07-15 | DYN | Gift | 10,000 | 232,179 | Form 4 |
| 2024-12-04 | DYN | Award / grant | 145,300 | 150,300 | Form 4 |
| 2024-12-04 | DYN | Award / grant | 232,100 | 232,100 | Form 4 |
Source: SEC Form 4 filings. Each row links to its original filing.
Research tool, not investment advice — historical frequencies, not recommendations. A product of Marovel Technologies LLC. Full terms.