John Cox

Insider Reports History

Location
Waltham, MA
Signature
/s/ Ron Caponigro, 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

Holdings reported by John Cox:

Stock Role Class Num Shares Value Price $ Report Date Ownership
Dyne Therapeutics, Inc. CEO & President, Director Common Stock 197K $4.08M $20.72 05 Dec 2025 Direct
Dyne Therapeutics, Inc. CEO & President, Director Common Stock 18K $435K $24.17 05 Dec 2025 By Trust #1
Dyne Therapeutics, Inc. CEO & President, Director Common Stock 18K $435K $24.17 05 Dec 2025 By Trust #2
Dyne Therapeutics, Inc. CEO & President, Director Common Stock 18K $435K $24.17 05 Dec 2025 By Trust #3
Dyne Therapeutics, Inc. CEO & President, Director Common Stock 18K $435K $24.17 05 Dec 2025 By Trust #4
Dyne Therapeutics, Inc. CEO & President, Director Stock option (right to buy) 197K 16 Jul 2025 Direct
Sigilon Therapeutics, Inc. Director Common Stock 0 11 Aug 2023 Direct
Sigilon Therapeutics, Inc. Director Stock Option (Right to Buy) 0 $0.75 11 Aug 2023 Direct

Insider Reports Filed by John Cox

Symbol Company Period Transactions Value $ Form Type Role Filing Time
DYN Dyne Therapeutics, Inc. 05 Dec 2025 1 -$55.2K 4 CEO & President, Director 05 Dec 2025, 16:11
DYN Dyne Therapeutics, Inc. 05 Sep 2025 1 -$35.4K 4 CEO & President, Director 09 Sep 2025, 16:31
DYN Dyne Therapeutics, Inc. 16 Jul 2025 1 $0 4 CEO & President, Director 18 Jul 2025, 17:19
DYN Dyne Therapeutics, Inc. 14 Jul 2025 5 $911K 4 CEO & President, Director 15 Jul 2025, 17:11
DYN Dyne Therapeutics, Inc. 05 Jun 2025 1 -$54.2K 4 CEO & President, Director 06 Jun 2025, 16:07
DYN Dyne Therapeutics, Inc. 05 Mar 2025 1 -$48K 4 CEO & President, Director 07 Mar 2025, 16:07
DYN Dyne Therapeutics, Inc. 04 Dec 2024 2 $0 4 CEO & President, Director 06 Dec 2024, 16:05
DYN Dyne Therapeutics, Inc. 04 Sep 2024 8 $1.06M 4 CEO & President, Director 04 Sep 2024, 17:42
DYN Dyne Therapeutics, Inc. 25 Mar 2024 0 $0 3/A CEO & President, Director 04 Apr 2024, 21:07
DYN Dyne Therapeutics, Inc. 25 Mar 2024 1 $0 4 Chief Executive Officer and President, Director 27 Mar 2024, 16:24
DYN Dyne Therapeutics, Inc. 25 Mar 2024 0 $0 3 Chief Executive Officer and President Exhibit Index: 24.1 Power of Attorney, Director 27 Mar 2024, 16:13
SGTX Sigilon Therapeutics, Inc. 11 Aug 2023 3 -$7.95K 4 Director 11 Aug 2023, 16:10
SGTX Sigilon Therapeutics, Inc. 19 May 2023 1 $0 4 Director 22 May 2023, 16:20
SGTX Sigilon Therapeutics, Inc. 26 May 2022 1 $0 4 Director 27 May 2022, 17:00
SGTX Sigilon Therapeutics, Inc. 24 Jun 2021 1 $88.6K 4 Director 28 Jun 2021, 07:15