Brian S. Posner

Business address
14 Cambridge Center, Cambridge, MA, 02142
Top holdings (ownership)
ACGL, BIIB, and DYN
Get insider transactions for this reporting owner
Brian S. Posner has filed 84 SEC EDGAR filings since 11 Aug 2006

Latest Filings

Form type Document Filing Description Filing date Reporting date File number(s)
4 Open Document Open Filing 4 02 Oct 2025 01 Oct 2025 001-39509
3 Open Document Open Filing 3 02 Oct 2025 01 Oct 2025 001-39509
4 Open Document Open Filing 04 Aug 2025 01 Aug 2025 001-16209
4 Open Document Open Filing 09 May 2025 07 May 2025 001-16209
4 Open Document Open Filing 13 May 2024 09 May 2024 001-16209
4 Open Document Open Filing 08 May 2023 04 May 2023 001-16209
5 Open Document Open Filing PRIMARY DOCUMENT 27 Jan 2023 31 Dec 2022 000-19311
4 Open Document Open Filing 01 Nov 2022 28 Oct 2022 001-16209
4 Open Document Open Filing FORM 4 - 06 May 2022 04 May 2022 001-16209
4 Open Document Open Filing FORM 4 - 02 May 2022 29 Apr 2022 001-16209
4 Open Document Open Filing FORM 4 - 01 Oct 2021 30 Sep 2021 001-16209
4 Open Document Open Filing PRIMARY DOCUMENT 02 Jul 2021 01 Jul 2021 000-19311
4 Open Document Open Filing FORM 4 - 15 Jun 2021 14 Jun 2021 001-16209
4 Open Document Open Filing PRIMARY DOCUMENT 07 Jun 2021 04 Jun 2021 000-19311
4 Open Document Open Filing FORM 4 - 10 May 2021 06 May 2021 001-16209
5 Open Document Open Filing PRIMARY DOCUMENT 09 Feb 2021 31 Dec 2020 000-19311
4 Open Document Open Filing PRIMARY DOCUMENT 05 Jun 2020 03 Jun 2020 000-19311
4 Open Document Open Filing FORM 4 - 15 May 2020 13 May 2020 001-16209
4 Open Document Open Filing FORM 4 - 08 May 2020 06 May 2020 001-16209
4 Open Document Open Filing PRIMARY DOCUMENT 03 Dec 2019 02 Dec 2019 000-19311
4 Open Document Open Filing PRIMARY DOCUMENT 20 Jun 2019 19 Jun 2019 000-19311
4 Open Document Open Filing FORM 4 - 09 May 2019 08 May 2019 001-16209
4 Open Document Open Filing PRIMARY DOCUMENT 15 Feb 2019 14 Feb 2019 000-19311
4 Open Document Open Filing FORM 4 - 29 Nov 2018 28 Nov 2018 001-16209
4 Open Document Open Filing FORM 4 - 06 Nov 2018 05 Nov 2018 001-16209
4 Open Document Open Filing PRIMARY DOCUMENT 14 Jun 2018 12 Jun 2018 000-19311
4 Open Document Open Filing FORM 4 - 10 May 2018 09 May 2018 001-16209
4 Open Document Open Filing FORM 4 - 04 May 2018 03 May 2018 001-16209
4 Open Document Open Filing PRIMARY DOCUMENT 08 Mar 2018 08 Mar 2018 001-37859
4 Open Document Open Filing PRIMARY DOCUMENT 02 Feb 2018 31 Jan 2018 001-37859
4 Open Document Open Filing FORM 4 - 02 Jan 2018 02 Jan 2018 001-16209
4 Open Document Open Filing FORM 4 - 26 Sep 2017 25 Sep 2017 001-16209
4 Open Document Open Filing FORM 4 - 19 Sep 2017 18 Sep 2017 001-16209
4 Open Document Open Filing PRIMARY DOCUMENT 10 Aug 2017 09 Aug 2017 001-37859
4 Open Document Open Filing PRIMARY DOCUMENT 12 Jun 2017 09 Jun 2017 000-19311
4 Open Document Open Filing PRIMARY DOCUMENT 09 Jun 2017 07 Jun 2017 000-19311
4 Open Document Open Filing PRIMARY DOCUMENT 24 May 2017 24 May 2017 001-37859
4 Open Document Open Filing FORM 4 - 05 May 2017 04 May 2017 001-16209
4 Open Document Open Filing PRIMARY DOCUMENT 17 Apr 2017 17 Apr 2017 001-37859
4/A Open Document Open Filing PRIMARY DOCUMENT 27 Mar 2017 14 Feb 2017 001-37859
4 Open Document Open Filing PRIMARY DOCUMENT 16 Feb 2017 14 Feb 2017 001-37859
3 Open Document Open Filing PRIMARY DOCUMENT 19 Jan 2017 10 Jan 2017 001-37859
4 Open Document Open Filing FORM 4 - 21 Nov 2016 18 Nov 2016 001-16209
4 Open Document Open Filing PRIMARY DOCUMENT 09 Jun 2016 08 Jun 2016 000-19311
4 Open Document Open Filing FORM 4 - 09 May 2016 06 May 2016 001-16209
4 Open Document Open Filing PRIMARY DOCUMENT 23 Jun 2015 22 Jun 2015 000-19311
4 Open Document Open Filing PRIMARY DOCUMENT 16 Jun 2015 15 Jun 2015 000-19311
4 Open Document Open Filing PRIMARY DOCUMENT 11 Jun 2015 10 Jun 2015 000-19311
4 Open Document Open Filing FORM 4 - 11 May 2015 07 May 2015 001-16209
4 Open Document Open Filing PRIMARY DOCUMENT 10 Feb 2015 06 Feb 2015 000-19311
4 Open Document Open Filing PRIMARY DOCUMENT 25 Jul 2014 24 Jul 2014 000-19311
4 Open Document Open Filing PRIMARY DOCUMENT 23 Jun 2014 20 Jun 2014 000-19311
4 Open Document Open Filing PRIMARY DOCUMENT 16 Jun 2014 12 Jun 2014 000-19311
4 Open Document Open Filing FORM 4 - BRIAN POSNER 05 Jun 2014 03 Jun 2014 001-33827
4 Open Document Open Filing FORM 4 - 13 May 2014 09 May 2014 001-16209
4 Open Document Open Filing PRIMARY DOCUMENT 01 Apr 2014 31 Mar 2014 000-19311