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Cox John

In the past year, 6 open-market sale filings worth $443.7K and no purchases.

Current role at each company

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

Insider trades
Filed (ET)Trade dateFiling delayInsiderTransactionSharesAvg priceValueHolding changeFlags
Sep 8, 2026 (view filing)4:13 PM ETSep 8Same dayCox JohnCEO & PresidentSSale−5.66K$18.88−$106.8K−1.6%357.5K after10b5-1
Aug 17, 2026 (view filing)4:07 PM ETAug 134 daysCox JohnCEO & PresidentSSale−4.99K$26.28−$131.0K−1.4%363.2K after10b5-1
Jun 17, 2026 (view filing)Jun 161 dayCox JohnCEO & PresidentSSale−2.68K$18.33−$49.2K−0.7%368.2K after10b5-1
May 14, 2026 (view filing)May 131 dayCox JohnCEO & PresidentSSale−3.31K$18.36−$60.8K−0.9%370.8K after10b5-1
Mar 6, 2026 (view filing)Mar 51 dayCox JohnCEO & PresidentSSale−2.73K$14.90−$40.7K−0.7%374.1K after10b5-1
Dec 5, 2025 (view filing)Dec 5Same dayCox JohnCEO & PresidentSSale−2.66K$20.72−$55.2K−1.3%196.9K after10b5-1
Sep 9, 2025 (view filing)Sep 54 daysCox JohnCEO & PresidentSSale−2.64K$13.41−$35.4K−1.3%199.5K after10b5-1
Jul 15, 2025 (view filing)Jul 141 dayCox JohnCEO & PresidentPPurchase+100.0K$9.11+$911.0K+70.3%242.2K after
Jun 6, 2025 (view filing)Jun 51 dayCox JohnCEO & PresidentSSale−4.06K$13.35−$54.2K−2.8%142.2K after10b5-1
Mar 7, 2025 (view filing)Mar 52 daysCox JohnCEO & PresidentSSale−4.06K$11.83−$48.0K−2.7%146.2K after10b5-1

See all 11 trades at DYN