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:

Company Role Class Num Shares Value Price $ Report Date Ownership
Dyne Therapeutics, Inc. CEO & President, Director Common Stock 196,877 $4,079,291 $20.72 05 Dec 2025 Direct
Dyne Therapeutics, Inc. CEO & President, Director Common Stock 18,000 $435,060 $24.17 05 Dec 2025 By Trust #1
Dyne Therapeutics, Inc. CEO & President, Director Common Stock 18,000 $435,060 $24.17 05 Dec 2025 By Trust #2
Dyne Therapeutics, Inc. CEO & President, Director Common Stock 18,000 $435,060 $24.17 05 Dec 2025 By Trust #3
Dyne Therapeutics, Inc. CEO & President, Director Common Stock 18,000 $435,060 $24.17 05 Dec 2025 By Trust #4
Dyne Therapeutics, Inc. CEO & President, Director Stock option (right to buy) 197,285 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 $0.7500 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 -$55,157 4 CEO & President, Director 05 Dec 2025, 16:11
DYN Dyne Therapeutics, Inc. 05 Sep 2025 1 -$35,402 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 +$911,000 4 CEO & President, Director 15 Jul 2025, 17:11
DYN Dyne Therapeutics, Inc. 05 Jun 2025 1 -$54,201 4 CEO & President, Director 06 Jun 2025, 16:07
DYN Dyne Therapeutics, Inc. 05 Mar 2025 1 -$48,042 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 +$1,057,216 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
/report/000141588923012134-cox-john-2023-08-11 Sigilon Therapeutics, Inc. 11 Aug 2023 3 -$7,952 4 Director 11 Aug 2023, 16:10
/report/000141588923008494-cox-john-2023-05-19 Sigilon Therapeutics, Inc. 19 May 2023 1 $0 4 Director 22 May 2023, 16:20
/report/000141588922005827-cox-john-2022-05-26 Sigilon Therapeutics, Inc. 26 May 2022 1 $0 4 Director 27 May 2022, 17:00
/report/000141588921003238-cox-john-2021-06-24 Sigilon Therapeutics, Inc. 24 Jun 2021 1 +$88,613 4 Director 28 Jun 2021, 07:15