Brian S. Posner

Insider Reports History

Location
Cambridge, 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 Brian S. Posner:

Stock Role Class Num Shares Value Price $ Report Date Ownership
ARCH CAPITAL GROUP LTD. Director Common Shares, $.0011 par value per share 120K $10.5M $87.84 01 Aug 2025 Direct
BIOGEN INC. Director Common Stock 8.03K $1.99M $248.00 07 Jun 2022 Direct
Dyne Therapeutics, Inc. Director Common Stock 8.5K $107K $12.58 01 Oct 2025 Direct
ARCH CAPITAL GROUP LTD. Director Depositary Shares, Series G 5K $86.7K $17.34 01 Aug 2025 Direct
Dyne Therapeutics, Inc. Director Stock option (right to buy) 70K 01 Oct 2025 Direct
ARCH CAPITAL GROUP LTD. Director Depositary Shares, Series F 3K 01 Aug 2025 Direct

Insider Reports Filed by Brian S. Posner

Symbol Company Period Transactions Value $ Form Type Role Filing Time
DYN Dyne Therapeutics, Inc. 01 Oct 2025 1 $0 4 Director 02 Oct 2025, 16:18
DYN Dyne Therapeutics, Inc. 01 Oct 2025 0 $0 3 Director 02 Oct 2025, 16:13
ACGL ARCH CAPITAL GROUP LTD. 01 Aug 2025 1 $17.3K 4 Director 04 Aug 2025, 16:23
ACGL ARCH CAPITAL GROUP LTD. 07 May 2025 1 $0 4 Director 09 May 2025, 17:15
ACGL ARCH CAPITAL GROUP LTD. 09 May 2024 1 $0 4 Director 13 May 2024, 18:51
ACGL ARCH CAPITAL GROUP LTD. 04 May 2023 1 $0 4 Director 08 May 2023, 18:21
BIIB BIOGEN INC. 31 Dec 2022 1 $0 5 Director 27 Jan 2023, 17:31
ACGL ARCH CAPITAL GROUP LTD. 28 Oct 2022 1 $35.2K 4 Director 01 Nov 2022, 18:39
ACGL ARCH CAPITAL GROUP LTD. 04 May 2022 2 $0 4 Director 06 May 2022, 16:04
ACGL ARCH CAPITAL GROUP LTD. 29 Apr 2022 1 $38.5K 4 Director 02 May 2022, 17:35
ACGL ARCH CAPITAL GROUP LTD. 30 Sep 2021 1 -$50K 4 Director 01 Oct 2021, 15:24
BIIB BIOGEN INC. 01 Jul 2021 1 $0 4 Director 02 Jul 2021, 17:31
ACGL ARCH CAPITAL GROUP LTD. 14 Jun 2021 1 -$101K 4 Director 15 Jun 2021, 18:14
BIIB BIOGEN INC. 04 Jun 2021 1 -$98.7K 4 Director 07 Jun 2021, 19:02
ACGL ARCH CAPITAL GROUP LTD. 06 May 2021 2 $0 4 Director 10 May 2021, 19:28