Posner Brian S
Insider CIK 1372455 · BGMD Director · BIVV Director · DYN Director · BIIB Director · ACGL Director
Trades across companies
| Ticker | Code | Trade | Filed | Shares | Price | Value | Owned after | |
|---|---|---|---|---|---|---|---|---|
| DYN Dyne Therapeutics, Inc. | P Buy | 2026-10-02 | 2026-10-06 | 2,500 | $16.00 | $40.0K | 27,000 | SEC↗ |
| DYN Dyne Therapeutics, Inc. | P Buy | 2026-06-08 | 2026-06-09 | 2,000 | $16.94 | $33.9K | 24,500 | SEC↗ |
| DYN Dyne Therapeutics, Inc. | A Award deriv | 2026-06-05 | 2026-06-09 | 35,152 | — | $0 | 35,152 | SEC↗ |
| ACGL ARCH CAPITAL GROUP LTD. | S Sale | 2026-06-03 | 2026-06-04 | 3,000 | $19.66 | $59.0K | 0 | SEC↗ |
| DYN Dyne Therapeutics, Inc. | P Buy | 2026-06-03 | 2026-06-05 | 2,500 | $17.48 | $43.7K | 22,500 | SEC↗ |
| DYN Dyne Therapeutics, Inc. | P Buy | 2026-05-26 | 2026-05-28 | 2,000 | $18.21 | $36.4K | 20,000 | SEC↗ |
| DYN Dyne Therapeutics, Inc. | P Buy | 2026-05-20 | 2026-05-22 | 2,500 | $17.12 | $42.8K | 18,000 | SEC↗ |
| ACGL ARCH CAPITAL GROUP LTD. | S Sale | 2026-05-11 | 2026-05-12 | 2,000 | $17.14 | $34.3K | 0 | SEC↗ |
| ACGL ARCH CAPITAL GROUP LTD. | A Award | 2026-05-05 | 2026-05-07 | 2,071 | — | $0 | 122,175 | SEC↗ |
| DYN Dyne Therapeutics, Inc. | P Buy | 2026-03-30 | 2026-04-01 | 2,000 | $17.08 | $34.2K | 15,500 | SEC↗ |
| ACGL ARCH CAPITAL GROUP LTD. | S Sale | 2026-03-11 | 2026-03-12 | 3,000 | $17.12 | $51.4K | 2,000 | SEC↗ |
| DYN Dyne Therapeutics, Inc. | P Buy | 2026-03-11 | 2026-03-13 | 2,000 | $19.35 | $38.7K | 13,500 | SEC↗ |
| DYN Dyne Therapeutics, Inc. | P Buy | 2026-03-06 | 2026-03-10 | 3,000 | $15.06 | $45.2K | 11,500 | SEC↗ |
| DYN Dyne Therapeutics, Inc. | A Award deriv | 2025-10-01 | 2025-10-02 | 70,000 | — | $0 | 70,000 | SEC↗ |
| ACGL ARCH CAPITAL GROUP LTD. | P Buy | 2025-08-01 | 2025-08-04 | 1,000 | $17.34 | $17.3K | 5,000 | SEC↗ |
| ACGL ARCH CAPITAL GROUP LTD. | A Award | 2025-05-07 | 2025-05-09 | 1,564 | — | $0 | 120,104 | SEC↗ |
| ACGL ARCH CAPITAL GROUP LTD. | A Award | 2024-05-09 | 2024-05-13 | 1,455 | — | $0 | 118,540 | SEC↗ |
| ACGL ARCH CAPITAL GROUP LTD. | A Award | 2023-05-04 | 2023-05-08 | 1,714 | — | $0 | 117,085 | SEC↗ |
| ACGL ARCH CAPITAL GROUP LTD. | P Buy | 2022-10-28 | 2022-11-01 | 2,000 | $17.60 | $35.2K | 4,000 | SEC↗ |
| ACGL ARCH CAPITAL GROUP LTD. | A Award | 2022-05-04 | 2022-05-06 | 2,642 | — | $0 | 115,371 | SEC↗ |
| ACGL ARCH CAPITAL GROUP LTD. | A Award | 2022-05-04 | 2022-05-06 | 2,642 | — | $0 | 112,729 | SEC↗ |
| ACGL ARCH CAPITAL GROUP LTD. | P Buy | 2022-04-29 | 2022-05-02 | 2,000 | $19.23 | $38.5K | 2,000 | SEC↗ |
| ACGL ARCH CAPITAL GROUP LTD. | D To issuer | 2021-09-30 | 2021-10-01 | 2,000 | $25.00 | $50.0K | 0 | SEC↗ |
| BIIB BIOGEN INC. | A Award | 2021-07-01 | 2021-07-02 | 775 | — | $0 | 8,175 | SEC↗ |
| ACGL ARCH CAPITAL GROUP LTD. | S Sale | 2021-06-14 | 2021-06-15 | 4,000 | $25.24 | $101.0K | 2,000 | SEC↗ |
| BIIB BIOGEN INC. | S Sale | 2021-06-04 | 2021-06-07 | 360 | $274.17 | $98.7K | 7,400 | SEC↗ |
| ACGL ARCH CAPITAL GROUP LTD. | A Award | 2021-05-06 | 2021-05-10 | 3,143 | — | $0 | 110,087 | SEC↗ |
| ACGL ARCH CAPITAL GROUP LTD. | A Award | 2021-05-06 | 2021-05-10 | 3,143 | — | $0 | 106,944 | SEC↗ |
| BIIB BIOGEN INC. | A Award | 2020-06-03 | 2020-06-05 | 890 | — | $0 | 7,885 | SEC↗ |
| ACGL ARCH CAPITAL GROUP LTD. | P Buy | 2020-05-13 | 2020-05-15 | 1,000 | $22.16 | $22.2K | 103,801 | SEC↗ |
| ACGL ARCH CAPITAL GROUP LTD. | A Award | 2020-05-07 | 2020-05-08 | 5,058 | — | $0 | 97,743 | SEC↗ |
| ACGL ARCH CAPITAL GROUP LTD. | A Award | 2020-05-07 | 2020-05-08 | 5,058 | — | $0 | 102,801 | SEC↗ |
| ACGL ARCH CAPITAL GROUP LTD. | P Buy | 2020-05-06 | 2020-05-08 | 1,000 | $23.72 | $23.7K | 92,685 | SEC↗ |
| BIIB BIOGEN INC. | S Sale | 2019-12-02 | 2019-12-03 | 1,055 | $292.35 | $308.4K | 6,995 | SEC↗ |
| BIIB BIOGEN INC. | A Award | 2019-06-19 | 2019-06-20 | 1,155 | — | $0 | 8,050 | SEC↗ |
| ACGL ARCH CAPITAL GROUP LTD. | A Award | 2019-05-08 | 2019-05-09 | 3,726 | — | $0 | 88,853 | SEC↗ |
| ACGL ARCH CAPITAL GROUP LTD. | A Award | 2019-05-08 | 2019-05-09 | 2,832 | — | $0 | 91,685 | SEC↗ |
| BIIB BIOGEN INC. | G Gift | 2019-02-14 | 2019-02-15 | 315 | — | $0 | 6,895 | SEC↗ |
| ACGL ARCH CAPITAL GROUP LTD. | P Buy | 2018-11-28 | 2018-11-29 | 500 | $28.24 | $14.1K | 85,127 | SEC↗ |
| ACGL ARCH CAPITAL GROUP LTD. | P Buy | 2018-11-28 | 2018-11-29 | 500 | $21.86 | $10.9K | 3,000 | SEC↗ |
| ACGL ARCH CAPITAL GROUP LTD. | P Buy | 2018-11-05 | 2018-11-06 | 2,500 | $22.45 | $56.1K | 2,500 | SEC↗ |
| BIIB BIOGEN INC. | A Award | 2018-06-12 | 2018-06-14 | 880 | — | $0 | 7,210 | SEC↗ |
| ACGL ARCH CAPITAL GROUP LTD. | A Award | 2018-05-09 | 2018-05-10 | 1,196 | — | $0 | 28,209 | SEC↗ |
| ACGL ARCH CAPITAL GROUP LTD. | A Award | 2018-05-09 | 2018-05-10 | 1,574 | — | $0 | 27,013 | SEC↗ |
| ACGL ARCH CAPITAL GROUP LTD. | P Buy | 2018-05-03 | 2018-05-04 | 2,000 | $79.25 | $158.5K | 24,439 | SEC↗ |
| ACGL ARCH CAPITAL GROUP LTD. | P Buy | 2018-05-03 | 2018-05-04 | 1,000 | $77.38 | $77.4K | 25,439 | SEC↗ |
| BIVV Bioverativ Inc. | D To issuer deriv | 2018-03-08 | 2018-03-08 | 2,980 | — | $0 | 0 | SEC↗ |
| BIVV Bioverativ Inc. | D To issuer deriv | 2018-03-08 | 2018-03-08 | 6,364 | — | $0 | 0 | SEC↗ |
| BIVV Bioverativ Inc. | D To issuer deriv | 2018-03-08 | 2018-03-08 | 26,818 | — | $0 | 0 | SEC↗ |
| BIVV Bioverativ Inc. | D To issuer | 2018-03-08 | 2018-03-08 | 6,693 | — | $0 | 0 | SEC↗ |
| BIVV Bioverativ Inc. | A Award deriv | 2018-01-31 | 2018-02-02 | 6,364 | — | $0 | 6,364 | SEC↗ |
| ACGL ARCH CAPITAL GROUP LTD. | D To issuer | 2018-01-02 | 2018-01-02 | 2,146 | $25.00 | $53.6K | 0 | SEC↗ |
| ACGL ARCH CAPITAL GROUP LTD. | D To issuer | 2017-09-25 | 2017-09-26 | 695 | $25.00 | $17.4K | 2,146 | SEC↗ |
| ACGL ARCH CAPITAL GROUP LTD. | D To issuer | 2017-09-18 | 2017-09-19 | 4,659 | $25.00 | $116.5K | 2,841 | SEC↗ |
| BIVV Bioverativ Inc. | P Buy | 2017-08-09 | 2017-08-10 | 1,000 | $59.19 | $59.2K | 6,693 | SEC↗ |
| BIIB BIOGEN INC. | S Sale | 2017-06-09 | 2017-06-12 | 1,084 | $256.31 | $277.8K | 6,330 | SEC↗ |
| BIIB BIOGEN INC. | A Award | 2017-06-07 | 2017-06-09 | 1,055 | — | $0 | 7,414 | SEC↗ |
| BIVV Bioverativ Inc. | P Buy | 2017-05-24 | 2017-05-24 | 700 | $53.79 | $37.7K | 5,693 | SEC↗ |
| BIVV Bioverativ Inc. | P Buy | 2017-05-24 | 2017-05-24 | 1,300 | $53.90 | $70.1K | 4,993 | SEC↗ |
| ACGL ARCH CAPITAL GROUP LTD. | A Award | 2017-05-04 | 2017-05-05 | 771 | — | $0 | 22,439 | SEC↗ |
| ACGL ARCH CAPITAL GROUP LTD. | A Award | 2017-05-04 | 2017-05-05 | 1,286 | — | $0 | 21,668 | SEC↗ |
| BIVV Bioverativ Inc. | A Award | 2017-04-17 | 2017-04-17 | 1,056 | $56.83 | $60.0K | 3,693 | SEC↗ |
| BIVV Bioverativ Inc. | A Award deriv | 2017-02-14 | 2017-02-16 | 26,770 | — | $0 | 26,770 | SEC↗ |
| BIVV Bioverativ Inc. | A Award deriv | 2017-02-14 | 2017-02-16 | 2,974 | — | $0 | 2,974 | SEC↗ |
| BIVV Bioverativ Inc. | A Award deriv | 2017-02-14 | 2017-03-27 | 2,980 | — | $0 | 2,980 | SEC↗ |
| BIVV Bioverativ Inc. | A Award deriv | 2017-02-14 | 2017-03-27 | 26,818 | — | $0 | 26,818 | SEC↗ |
| ACGL ARCH CAPITAL GROUP LTD. | P Buy | 2016-11-18 | 2016-11-21 | 6,000 | $21.88 | $131.3K | 6,000 | SEC↗ |
| BIIB BIOGEN INC. | A Award | 2016-06-08 | 2016-06-09 | 1,060 | — | $0 | 6,335 | SEC↗ |
| ACGL ARCH CAPITAL GROUP LTD. | A Award | 2016-05-06 | 2016-05-09 | 1,777 | — | $0 | 19,316 | SEC↗ |
| ACGL ARCH CAPITAL GROUP LTD. | A Award | 2016-05-06 | 2016-05-09 | 1,066 | — | $0 | 20,382 | SEC↗ |
| BIIB BIOGEN INC. | S Sale | 2015-06-22 | 2015-06-23 | 470 | $415.00 | $195.1K | 5,275 | SEC↗ |
| BIIB BIOGEN INC. | S Sale | 2015-06-15 | 2015-06-16 | 400 | $386.64 | $154.7K | 5,745 | SEC↗ |
| BIIB BIOGEN INC. | A Award | 2015-06-10 | 2015-06-11 | 695 | — | $0 | 6,145 | SEC↗ |
| ACGL ARCH CAPITAL GROUP LTD. | A Award | 2015-05-07 | 2015-05-11 | 1,201 | — | $0 | 17,539 | SEC↗ |
| ACGL ARCH CAPITAL GROUP LTD. | A Award | 2015-05-07 | 2015-05-11 | 1,601 | — | $0 | 16,338 | SEC↗ |
| BIIB BIOGEN IDEC INC. | G Gift | 2015-02-06 | 2015-02-10 | 250 | — | $0 | 5,450 | SEC↗ |
| BIIB BIOGEN IDEC INC. | G Gift | 2014-07-24 | 2014-07-25 | 300 | — | $0 | 5,700 | SEC↗ |
| BIIB BIOGEN IDEC INC. | S Sale | 2014-06-20 | 2014-06-23 | 605 | $315.00 | $190.6K | 6,000 | SEC↗ |
| BIIB BIOGEN IDEC INC. | S Sale | 2014-06-13 | 2014-06-16 | 700 | $310.50 | $217.3K | 6,605 | SEC↗ |
| BIIB BIOGEN IDEC INC. | A Award | 2014-06-12 | 2014-06-16 | 870 | — | $0 | 7,305 | SEC↗ |
| BGMD BG Medicine, Inc. | A Award deriv | 2014-06-03 | 2014-06-05 | 4,205 | — | $0 | 4,205 | SEC↗ |
| ACGL ARCH CAPITAL GROUP LTD. | A Award | 2014-05-09 | 2014-05-13 | 1,317 | — | $0 | 14,737 | SEC↗ |
| ACGL ARCH CAPITAL GROUP LTD. | A Award | 2014-05-09 | 2014-05-13 | 1,756 | — | $0 | 13,420 | SEC↗ |
| BIIB BIOGEN IDEC INC. | S Sale | 2014-03-31 | 2014-04-01 | 500 | $300.00 | $150.0K | 8,935 | SEC↗ |
| BIIB BIOGEN IDEC INC. | S Sale | 2014-03-31 | 2014-04-01 | 2,500 | $296.11 | $740.3K | 6,435 | SEC↗ |
| ACGL ARCH CAPITAL GROUP LTD. | P Buy | 2013-08-19 | 2013-08-20 | 2,500 | $23.58 | $58.9K | 7,500 | SEC↗ |
| ACGL ARCH CAPITAL GROUP LTD. | P Buy | 2013-08-02 | 2013-08-05 | 5,000 | $25.25 | $126.3K | 5,000 | SEC↗ |
| BGMD BG Medicine, Inc. | A Award deriv | 2013-06-12 | 2013-06-14 | 4,205 | — | $0 | 4,205 | SEC↗ |
| BIIB BIOGEN IDEC INC. | A Award | 2013-06-12 | 2013-06-13 | 1,305 | — | $0 | 9,435 | SEC↗ |
| BIIB BIOGEN IDEC INC. | S Sale | 2013-06-11 | 2013-06-13 | 2,020 | $219.62 | $443.6K | 8,130 | SEC↗ |
| ACGL ARCH CAPITAL GROUP LTD. | A Award | 2013-05-09 | 2013-05-13 | 1,401 | — | $0 | 10,263 | SEC↗ |
| ACGL ARCH CAPITAL GROUP LTD. | A Award | 2013-05-09 | 2013-05-13 | 1,401 | — | $0 | 11,664 | SEC↗ |
| BIIB BIOGEN IDEC INC. | S Sale | 2013-03-18 | 2013-03-19 | 4,500 | $174.81 | $786.6K | 10,150 | SEC↗ |
| BGMD BG Medicine, Inc. | P Buy | 2012-11-19 | 2012-11-20 | 10,000 | $1.17 | $11.7K | 20,000 | SEC↗ |
| BIIB BIOGEN IDEC INC. | A Award | 2012-06-08 | 2012-06-11 | 2,020 | — | $0 | 14,650 | SEC↗ |
| BIIB BIOGEN IDEC INC. | M Exercise deriv | 2012-06-07 | 2012-06-11 | 2,500 | — | $0 | 0 | SEC↗ |
| BIIB BIOGEN IDEC INC. | M Exercise | 2012-06-07 | 2012-06-11 | 2,500 | $71.38 | $178.4K | 15,130 | SEC↗ |
| BIIB BIOGEN IDEC INC. | S Sale | 2012-06-07 | 2012-06-11 | 2,500 | $135.00 | $337.5K | 12,630 | SEC↗ |
| BIIB BIOGEN IDEC INC. | M Exercise deriv | 2012-06-04 | 2012-06-05 | 2,400 | — | $0 | 2,500 | SEC↗ |
| BIIB BIOGEN IDEC INC. | S Sale | 2012-06-04 | 2012-06-05 | 2,400 | $126.45 | $303.5K | 12,630 | SEC↗ |
| BIIB BIOGEN IDEC INC. | M Exercise | 2012-06-04 | 2012-06-05 | 2,400 | $71.38 | $171.3K | 15,030 | SEC↗ |
| BGMD BG Medicine, Inc. | P Buy | 2012-05-22 | 2012-05-23 | 10,000 | $4.04 | $40.4K | 10,000 | SEC↗ |
| ACGL ARCH CAPITAL GROUP LTD. | A Award | 2012-05-09 | 2012-05-11 | 1,944 | — | $0 | 8,862 | SEC↗ |
| ACGL ARCH CAPITAL GROUP LTD. | A Award | 2012-05-09 | 2012-05-11 | 1,944 | — | $0 | 6,918 | SEC↗ |
| BGMD BG Medicine, Inc. | A Award deriv | 2012-02-13 | 2012-02-15 | 8,410 | — | $0 | 8,410 | SEC↗ |