Cox John

Executive buyer

Director, CEO & President · Dyne Therapeutics, Inc.

Every open-market stock purchase Cox John has reported to the SEC on Form 4 that met our signal bar, parsed straight from the filings. This page tracks where how the prices paid compare to where the stock trades now.

Total bought

$1.9M

Open-market buys

Companies

Last buy

Jul 14, 2025

Where the buys stand today

DYN
Dyne Therapeutics, Inc.
5 purchases totalling $1.9M at an average of $14.47 per share. See all insider buying in DYN →
Avg price paid
$14.47
Latest price
—
Market cap
Unknown

All reported buys

Date	Ticker	Shares	Price	Value	Filing
Jul 14, 2025	DYN	100,000	$9.11	$911.0K	SEC ↗
Sep 4, 2024	DYN	7,200	$33.09	$238.2K	SEC ↗
Sep 4, 2024	DYN	7,200	$33.09	$238.2K	SEC ↗
Sep 4, 2024	DYN	7,200	$33.09	$238.2K	SEC ↗
Sep 4, 2024	DYN	7,200	$33.09	$238.2K	SEC ↗

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About this data

Figures are parsed from Cox John's Form 4 filings on SEC EDGAR (CIK 1498428) and cover open-market purchases (transaction code P) — grants, option exercises, and sales are excluded, which is why totals here can differ from raw filing counts. Every row links to its source document.

This page is informational and reflects public filing data. It is not investment advice.