Info
Insider Ownership

Insider Trading & Ownership of John Cox

Location: Waltham, MA
Summary: The estimated net worth of John Cox is at least $5.82M dollars as of 05 Dec 2025. John Cox is the CEO & President, Director of Dyne Therapeutics, Inc. and owns shares of Dyne Therapeutics, Inc. (DYN) stock worth about $5.82M.
Signature: /s/ Ron Caponigro, Attorney-in-Fact
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Ownership of John Cox

Symbol	Company	Relationship	Holdings Value	Past Year Net Change	Change %	Report Period
DYN	Dyne Therapeutics, Inc.	CEO & President, Director	$5.82M	+$718K	+14.1%	05 Dec 2025
SGTX	Sigilon Therapeutics, Inc.	Director				11 Aug 2023

Insider Transactions Reported by John Cox:

Sym	Company	Class	Transaction	%	Value $	* Price $	Shares	Shares After	Date	Ownership

* An asterisk sign (*) next to the price indicates that the price is likely invalid.