John Cox Dyne Therapeutics, Inc. (DYN) insider trading activity

John Cox is CEO & President of Dyne Therapeutics, Inc.. Currently has a direct ownership of 196,877 shares of DYN, which is worth approximately $3.71 Million. The most recent transaction as insider was on Dec 05, 2025, when has been sold 2,662 shares (Common Stock) at a price of $20.72 per share, resulting in proceeds of $55,156. This information was disclosed in a Form 4 filing with the Securities and Exchange Commission (SEC).

Shares Held (Direct Ownership) 197K

1.33% 3M change

30.99% 12M change

Total Value Held $3.71 Million

John Cox Transaction History

Date	Transaction	Value	Shares Traded	Shares Held
Dec 05 2025	SELL Open market or private sale	$55,156 $20.72 p/Share	2,662 Reduced 1.33%	196,877 Common Stock
Sep 05 2025	SELL Open market or private sale	$35,402 $13.41 p/Share	2,640 Reduced 1.31%	199,539 Common Stock
Jul 15 2025	SELL Bona fide gift	-	40,000 Reduced 16.52%	202,179 Common Stock
Jul 14 2025	BUY Open market or private purchase	$911,000 $9.11 p/Share	100,000 Added 29.22%	242,179 Common Stock
Jun 05 2025	SELL Open market or private sale	$54,201 $13.35 p/Share	4,060 Reduced 2.78%	142,179 Common Stock
Mar 05 2025	SELL Open market or private sale	$48,041 $11.83 p/Share	4,061 Reduced 2.7%	146,239 Common Stock
Dec 04 2024	BUY Grant, award, or other acquisition	-	145,300 Added 49.15%	150,300 Common Stock

Also insider at

SGTX

Sigilon Therapeutics, Inc. Healthcare

John Cox

CEO & President

Cambridge, MA

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