COX JOHN

Director at BENCHMARK ELECTRONICS INC · on record since May 17, 2006
CEO & President at Dyne Therapeutics, Inc. · on record since Mar 27, 2024
EVP Pharmaceutical Oper & Tech at BIOGEN INC. · on record since Aug 10, 2010
Director at REPLIGEN CORP · on record since Nov 19, 2013
Director at Bioverativ Inc. · on record since Dec 22, 2016
Chief Executive Officer at Bioverativ Inc. · on record since Dec 22, 2016
Director at Sigilon Therapeutics, Inc. · on record since Dec 10, 2020
Director at Dyne Therapeutics, Inc. · on record since May 14, 2026

Insider trading activity of COX JOHN

Transactions on record: 214; since May 25, 2004

Open-market buys: 9; $2M

Open-market sells: 29; $15.3M

Companies traded: 6; last filing Sep 8, 2026

Figures computed from official regulatory filings — .

Companies where COX JOHN has traded

Dyne Therapeutics, Inc.28 tx · $2.5M · Sep 8, 2026
Sigilon Therapeutics, Inc.8 tx · $96.6K · Aug 11, 2023
REPLIGEN CORP30 tx · $4.9M · Mar 26, 2020
Bioverativ Inc.31 tx · $6.4M · Mar 8, 2018
BIOGEN INC.114 tx · $20.9M · Apr 5, 2016
BENCHMARK ELECTRONICS INC3 tx · $737.6K · May 17, 2006

Track record of COX JOHN

Open-market buys: 9

Last buy: Jul 14, 2025

Enough buys on record, but none of them has a 63-day return yet — this happens when the shares stopped trading, or when the buys are too recent. Win rates will appear once returns mature.

Transaction history of COX JOHN

Co-insiders of COX JOHN

This page republishes public regulatory disclosures.

Company	Filed	Type	Qty	Price	Value · USD	Src
Dyne Therapeutics, Inc.Listing unverified	Sep 8, 2026	Sell	-5,658	18.88 USD	$106.8K	SEC
Dyne Therapeutics, Inc.Listing unverified	Aug 17, 2026	Sell	-4,986	26.28 USD	$131K	SEC
Dyne Therapeutics, Inc.Listing unverified	Jun 17, 2026	Sell	-2,683	18.33 USD	$49.2K	SEC
Dyne Therapeutics, Inc.Listing unverified	May 14, 2026	Sell	-3,311	18.36 USD	$60.8K	SEC
Dyne Therapeutics, Inc.Listing unverified	Mar 6, 2026	Sell	-2,732	14.90 USD	$40.7K	SEC
Dyne Therapeutics, Inc.Listing unverified	Feb 17, 2026	Award	180,000	0.00 USD	—	SEC
Dyne Therapeutics, Inc.Listing unverified	Feb 17, 2026	AwardD (derivative)	285,000	0.00 USD	—	SEC
Dyne Therapeutics, Inc.Listing unverified	Dec 5, 2025	Sell	-2,662	20.72 USD	$55.2K	SEC
Dyne Therapeutics, Inc.Listing unverified	Sep 9, 2025	Sell	-2,640	13.41 USD	$35.4K	SEC
Dyne Therapeutics, Inc.Listing unverified	Jul 18, 2025	AwardD (derivative)	197,285	0.00 USD	—	SEC
Dyne Therapeutics, Inc.Listing unverified	Jul 15, 2025	Gift	-10,000	0.00 USD	—	SEC
Dyne Therapeutics, Inc.Listing unverified	Jul 15, 2025	Gift	-10,000	0.00 USD	—	SEC
Dyne Therapeutics, Inc.Listing unverified	Jul 15, 2025	Gift	-10,000	0.00 USD	—	SEC
Dyne Therapeutics, Inc.Listing unverified	Jul 15, 2025	Buy	100,000	9.11 USD	$911K	SEC
Dyne Therapeutics, Inc.Listing unverified	Jul 15, 2025	Gift	-10,000	0.00 USD	—	SEC
Dyne Therapeutics, Inc.Listing unverified	Jun 6, 2025	Sell	-4,060	13.35 USD	$54.2K	SEC
Dyne Therapeutics, Inc.Listing unverified	Mar 7, 2025	Sell	-4,061	11.83 USD	$48K	SEC
Dyne Therapeutics, Inc.Listing unverified	Dec 6, 2024	Award	145,300	0.00 USD	—	SEC
Dyne Therapeutics, Inc.Listing unverified	Dec 6, 2024	AwardD (derivative)	232,100	0.00 USD	—	SEC
Dyne Therapeutics, Inc.Listing unverified	Sep 4, 2024	Buy	800	32.57 USD	$26.1K	SEC
Dyne Therapeutics, Inc.Listing unverified	Sep 4, 2024	Buy	7,200	33.09 USD	$238.2K	SEC
Dyne Therapeutics, Inc.Listing unverified	Sep 4, 2024	Buy	7,200	33.09 USD	$238.2K	SEC
Dyne Therapeutics, Inc.Listing unverified	Sep 4, 2024	Buy	800	32.57 USD	$26.1K	SEC
Dyne Therapeutics, Inc.Listing unverified	Sep 4, 2024	Buy	7,200	33.09 USD	$238.2K	SEC
Dyne Therapeutics, Inc.Listing unverified	Sep 4, 2024	Buy	7,200	33.09 USD	$238.2K	SEC

Company	Filed	Type	Qty	Price	Value · USD	Src
Dyne Therapeutics, Inc.Listing unverified	Sep 8, 2026	Sell	-5,658	18.88 USD	$106.8K	SEC
Dyne Therapeutics, Inc.Listing unverified	Aug 17, 2026	Sell	-4,986	26.28 USD	$131K	SEC
Dyne Therapeutics, Inc.Listing unverified	Jun 17, 2026	Sell	-2,683	18.33 USD	$49.2K	SEC
Dyne Therapeutics, Inc.Listing unverified	May 14, 2026	Sell	-3,311	18.36 USD	$60.8K	SEC
Dyne Therapeutics, Inc.Listing unverified	Mar 6, 2026	Sell	-2,732	14.90 USD	$40.7K	SEC
Dyne Therapeutics, Inc.Listing unverified	Feb 17, 2026	Award	180,000	0.00 USD	—	SEC
Dyne Therapeutics, Inc.Listing unverified	Feb 17, 2026	AwardD (derivative)	285,000	0.00 USD	—	SEC
Dyne Therapeutics, Inc.Listing unverified	Dec 5, 2025	Sell	-2,662	20.72 USD	$55.2K	SEC
Dyne Therapeutics, Inc.Listing unverified	Sep 9, 2025	Sell	-2,640	13.41 USD	$35.4K	SEC
Dyne Therapeutics, Inc.Listing unverified	Jul 18, 2025	AwardD (derivative)	197,285	0.00 USD	—	SEC
Dyne Therapeutics, Inc.Listing unverified	Jul 15, 2025	Gift	-10,000	0.00 USD	—	SEC
Dyne Therapeutics, Inc.Listing unverified	Jul 15, 2025	Gift	-10,000	0.00 USD	—	SEC
Dyne Therapeutics, Inc.Listing unverified	Jul 15, 2025	Gift	-10,000	0.00 USD	—	SEC
Dyne Therapeutics, Inc.Listing unverified	Jul 15, 2025	Buy	100,000	9.11 USD	$911K	SEC
Dyne Therapeutics, Inc.Listing unverified	Jul 15, 2025	Gift	-10,000	0.00 USD	—	SEC
Dyne Therapeutics, Inc.Listing unverified	Jun 6, 2025	Sell	-4,060	13.35 USD	$54.2K	SEC
Dyne Therapeutics, Inc.Listing unverified	Mar 7, 2025	Sell	-4,061	11.83 USD	$48K	SEC
Dyne Therapeutics, Inc.Listing unverified	Dec 6, 2024	Award	145,300	0.00 USD	—	SEC
Dyne Therapeutics, Inc.Listing unverified	Dec 6, 2024	AwardD (derivative)	232,100	0.00 USD	—	SEC
Dyne Therapeutics, Inc.Listing unverified	Sep 4, 2024	Buy	800	32.57 USD	$26.1K	SEC
Dyne Therapeutics, Inc.Listing unverified	Sep 4, 2024	Buy	7,200	33.09 USD	$238.2K	SEC
Dyne Therapeutics, Inc.Listing unverified	Sep 4, 2024	Buy	7,200	33.09 USD	$238.2K	SEC
Dyne Therapeutics, Inc.Listing unverified	Sep 4, 2024	Buy	800	32.57 USD	$26.1K	SEC
Dyne Therapeutics, Inc.Listing unverified	Sep 4, 2024	Buy	7,200	33.09 USD	$238.2K	SEC
Dyne Therapeutics, Inc.Listing unverified	Sep 4, 2024	Buy	7,200	33.09 USD	$238.2K	SEC