Cox John
- SEC CIK
- 0001498428
In the past year, 6 open-market sale filings worth $443.7K and no purchases.
Current role at each company
- DYN Dyne Therapeutics, Inc.CEO & Presidentas of Sep 8, 2026
- SGTX Sigilon Therapeutics, Inc.Directoras of Aug 11, 2023
Open-market trades in the past year
Open-market purchases (P) and sales (S) filed in the last 365 days, not counting derivative securities or duplicate filings. Values leave out price outliers.
- Bought
- –
- 0 filings
- Sold
- $443.7K
- 6 filings
- Net
- −$443.7K
- Bought minus sold
- Companies
- 1
- With open-market trades
Trades
Every Form 4 that lists Cox John as a reporting owner, including filings made jointly with others, grouped by company. Each row adds up one type of transaction in one filing. Only open-market purchases (P) and sales (S) are shown by default.
DYN Dyne Therapeutics, Inc.
CEO & President11 trades
| Filed (ET) | Trade date | Filing delay | Insider | Transaction | Shares | Avg price | Value | Holding change | Flags |
|---|---|---|---|---|---|---|---|---|---|
| Sep 8, 2026 (view filing)4:13 PM ET | Sep 8 | Same day | Cox JohnCEO & President | SSale | −5.66K | $18.88 | −$106.8K | −1.6%357.5K after | 10b5-1 |
| Aug 17, 2026 (view filing)4:07 PM ET | Aug 13 | 4 days | Cox JohnCEO & President | SSale | −4.99K | $26.28 | −$131.0K | −1.4%363.2K after | 10b5-1 |
| Jun 17, 2026 (view filing) | Jun 16 | 1 day | Cox JohnCEO & President | SSale | −2.68K | $18.33 | −$49.2K | −0.7%368.2K after | 10b5-1 |
| May 14, 2026 (view filing) | May 13 | 1 day | Cox JohnCEO & President | SSale | −3.31K | $18.36 | −$60.8K | −0.9%370.8K after | 10b5-1 |
| Mar 6, 2026 (view filing) | Mar 5 | 1 day | Cox JohnCEO & President | SSale | −2.73K | $14.90 | −$40.7K | −0.7%374.1K after | 10b5-1 |
| Dec 5, 2025 (view filing) | Dec 5 | Same day | Cox JohnCEO & President | SSale | −2.66K | $20.72 | −$55.2K | −1.3%196.9K after | 10b5-1 |
| Sep 9, 2025 (view filing) | Sep 5 | 4 days | Cox JohnCEO & President | SSale | −2.64K | $13.41 | −$35.4K | −1.3%199.5K after | 10b5-1 |
| Jul 15, 2025 (view filing) | Jul 14 | 1 day | Cox JohnCEO & President | PPurchase | +100.0K | $9.11 | +$911.0K | +70.3%242.2K after | |
| Jun 6, 2025 (view filing) | Jun 5 | 1 day | Cox JohnCEO & President | SSale | −4.06K | $13.35 | −$54.2K | −2.8%142.2K after | 10b5-1 |
| Mar 7, 2025 (view filing) | Mar 5 | 2 days | Cox JohnCEO & President | SSale | −4.06K | $11.83 | −$48.0K | −2.7%146.2K after | 10b5-1 |