John Cox

Insider Reports History

Entity: Individual
Location: C/O Bioverativ Inc., 225 Second Avenue, Waltham, MA
Signature: /s/ Richard Scalzo, Attorney-in-Fact
All insider transactions: Transactions in reports broken out by “transaction date” reported in original SEC filing, see here for transactions aggregated across transaction date

Stock	Role	Class	Num Shares	Value	Price $	Report Date	Ownership
Dyne Therapeutics, Inc.	CEO & President, Director	Common Stock	8K	$265K	$33.09	Sep 4, 2024	By Trust #1
Dyne Therapeutics, Inc.	CEO & President, Director	Common Stock	8K	$265K	$33.09	Sep 4, 2024	By Trust #2
Dyne Therapeutics, Inc.	CEO & President, Director	Common Stock	8K	$265K	$33.09	Sep 4, 2024	By Trust #3
Dyne Therapeutics, Inc.	CEO & President, Director	Common Stock	8K	$265K	$33.09	Sep 4, 2024	By Trust #4
Dyne Therapeutics, Inc.	CEO & President, Director	Common Stock	5K	$165K	$33.09	Sep 4, 2024	Direct
Dyne Therapeutics, Inc.	CEO & President, Director	Stock Option (Right to Buy)	680K			Mar 25, 2024	Direct
Sigilon Therapeutics, Inc.	Director	Common Stock	0		$14.92	Aug 11, 2023	Direct
Sigilon Therapeutics, Inc.	Director	Stock Option (Right to Buy)	0		$6.64	Aug 11, 2023	Direct

Symbol	Company	Period	Transactions	Value $	Form Type	Date Filed	Role
DYN	Dyne Therapeutics, Inc.	Sep 4, 2024	8	$1.06M	4	Sep 4, 2024	CEO & President, Director
DYN	Dyne Therapeutics, Inc.	Mar 25, 2024	0	$0	3/A	Apr 4, 2024	CEO & President, Director
DYN	Dyne Therapeutics, Inc.	Mar 25, 2024	1	$0	4	Mar 27, 2024	Chief Executive Officer and President, Director
DYN	Dyne Therapeutics, Inc.	Mar 25, 2024	0	$0	3	Mar 27, 2024	Chief Executive Officer and President Exhibit Index: 24.1 Power of Attorney, Director
SGTX	Sigilon Therapeutics, Inc.	Aug 11, 2023	3	-$7.95K	4	Aug 11, 2023	Director
SGTX	Sigilon Therapeutics, Inc.	May 19, 2023	1	$0	4	May 22, 2023	Director
SGTX	Sigilon Therapeutics, Inc.	May 26, 2022	1	$0	4	May 27, 2022	Director
SGTX	Sigilon Therapeutics, Inc.	Jun 24, 2021	1	$88.6K	4	Jun 28, 2021	Director