John Cox

DYN

John Cox serves as director, officer: CEO & President at Dyne Therapeutics, Inc. (DYN). This page tracks their complete SEC Form 4 insider trading history including stock purchases and sales.

Total Buys

2 trades

$1.18M

Total Sells

6 trades

$294.3K

Net Position

Net Buyer

$881.0K

Companies Traded

DYN

Active Period

Sep 2024 – May 2026

8 total trades

Most Recent

Sell DYN

May 14, 2026 · $60.8K

John Cox's Insider Trading at Dyne Therapeutics, Inc. (DYN)

Buys

2 · $1.18M

Sells

6 · $294.3K

Total Shares Bought

108,000

Total Shares Sold

19,466

DYN Price Chart

Loading chart...

Date	Type	Shares	Avg Price	Value	Shares After
May 14, 2026	Sell	3,311	$18.36	$60.8K	370,834
Mar 6, 2026	Sell	2,732	$14.90	$40.7K	374,145
Dec 5, 2025	Sell	2,662	$20.72	$55.2K	196,877
Sep 9, 2025	Sell	2,640	$13.41	$35.4K	199,539
Jul 15, 2025	Buy	100,000	$9.11	$911.0K	242,179
Jun 6, 2025	Sell	4,060	$13.35	$54.2K	142,179
Mar 7, 2025	Sell	4,061	$11.83	$48.0K	146,239
Sep 4, 2024	Buy	8,000	$33.04	$264.3K	8,000