Posner Brian S

CIK 00013724556 companiesWALTHAM, MA

SEC Profile

Transactions

Companies

Filings

CIK

0001372455

Recent Transactions

50 trades

Purchase
Dyne Therapeutics, Inc.$DYN
Common Stock
2026-03-11$19.35/sh+2,000→ 13,500 total
Sale
ARCH CAPITAL GROUP LTD.$ACGL
Depositary Shares, Series G
2026-03-11$17.11/sh−3,000→ 2,000 total
Purchase
Dyne Therapeutics, Inc.$DYN
Common Stock
2026-03-06$15.06/sh+3,000→ 11,500 total
Award
Dyne Therapeutics, Inc.$DYN
Stock option (right to buy)
2025-10-01+70,000→ 70,000 total
Purchase
ARCH CAPITAL GROUP LTD.$ACGL
Depositary Shares, Series G
2025-08-01$17.34/sh+1,000→ 5,000 total
Award
ARCH CAPITAL GROUP LTD.$ACGL
Common Shares, $.0011 par value per share
2025-05-07+1,564→ 120,104 total
Award
ARCH CAPITAL GROUP LTD.$ACGL
Common Shares, $.0011 par value per share
2024-05-09+1,455→ 118,540 total
Award
ARCH CAPITAL GROUP LTD.$ACGL
Common Shares, $.0011 par value per share
2023-05-04+1,714→ 117,085 total
Purchase
ARCH CAPITAL GROUP LTD.$ACGL
Depositary Shares, Series G
2022-10-28$17.60/sh+2,000→ 4,000 total
Gift
BIOGEN INC.$BIIB
Common Stock
2022-06-07−150→ 8,025 total
Award
ARCH CAPITAL GROUP LTD.$ACGL
Common Shares, $.0011 par value per share
2022-05-04+2,642→ 115,371 total
Award
ARCH CAPITAL GROUP LTD.$ACGL
Common Shares, $.0011 par value per share
2022-05-04+2,642→ 112,729 total
Purchase
ARCH CAPITAL GROUP LTD.$ACGL
Depositary Shares, Series G
2022-04-29$19.23/sh+2,000→ 2,000 total
Disposition to Issuer
ARCH CAPITAL GROUP LTD.$ACGL
Depositary Shares, Series E
2021-09-30$25.00/sh−2,000→ 0 total
Award
BIOGEN INC.$BIIB
Common Stock
2021-07-01+775→ 8,175 total
Sale
ARCH CAPITAL GROUP LTD.$ACGL
Depositary Shares, Series E
2021-06-14$25.24/sh−4,000→ 2,000 total
Sale
BIOGEN INC.$BIIB
Common Stock
2021-06-04$274.17/sh−360→ 7,400 total
Award
ARCH CAPITAL GROUP LTD.$ACGL
Common Shares, $.0011 par value per share
2021-05-06+3,143→ 106,944 total
Award
ARCH CAPITAL GROUP LTD.$ACGL
Common Shares, $.0011 par value per share
2021-05-06+3,143→ 110,087 total
Gift
BIOGEN INC.$BIIB
Common Stock
2020-08-03−125→ 7,760 total
Award
BIOGEN INC.$BIIB
Common Stock
2020-06-03+890→ 7,885 total
Purchase
ARCH CAPITAL GROUP LTD.$ACGL
Common Shares, $.0011 par value per share
2020-05-13$22.16/sh+1,000→ 103,801 total
Award
ARCH CAPITAL GROUP LTD.$ACGL
Common Shares, $.0011 par value per share
2020-05-07+5,058→ 102,801 total
Award
ARCH CAPITAL GROUP LTD.$ACGL
Common Shares, $.0011 par value per share
2020-05-07+5,058→ 97,743 total
Purchase
ARCH CAPITAL GROUP LTD.$ACGL
Common Shares, $.0011 par value per share
2020-05-06$23.72/sh+1,000→ 92,685 total
Sale
BIOGEN INC.$BIIB
Common Stock
2019-12-02$292.35/sh−1,055→ 6,995 total
Award
BIOGEN INC.$BIIB
Common Stock
2019-06-19+1,155→ 8,050 total
Award
ARCH CAPITAL GROUP LTD.$ACGL
Common Shares, $.0011 par value per share
2019-05-08+3,726→ 88,853 total
Award
ARCH CAPITAL GROUP LTD.$ACGL
Common Shares, $.0011 par value per share
2019-05-08+2,832→ 91,685 total
Gift
BIOGEN INC.$BIIB
Common Stock
2019-02-14−315→ 6,895 total
Purchase
ARCH CAPITAL GROUP LTD.$ACGL
Depositary Shares, Series F
2018-11-28$21.86/sh+500→ 3,000 total
Purchase
ARCH CAPITAL GROUP LTD.$ACGL
Common Shares, $.0011 par value per share
2018-11-28$28.24/sh+500→ 85,127 total
Purchase
ARCH CAPITAL GROUP LTD.$ACGL
Depositary Shares, Series F
2018-11-05$22.45/sh+2,500→ 2,500 total
Award
BIOGEN INC.$BIIB
Common Stock
2018-06-12+880→ 7,210 total
Award
ARCH CAPITAL GROUP LTD.$ACGL
Common Shares, $.0033 par value per share
2018-05-09+1,574→ 27,013 total
Award
ARCH CAPITAL GROUP LTD.$ACGL
Common Shares, $.0033 par value per share
2018-05-09+1,196→ 28,209 total
Purchase
ARCH CAPITAL GROUP LTD.$ACGL
Common Shares, $.0033 par value per share
2018-05-03$77.38/sh+1,000→ 25,439 total
Purchase
ARCH CAPITAL GROUP LTD.$ACGL
Common Shares, $.0033 par value per share
2018-05-03$79.25/sh+2,000→ 24,439 total
Disposition to Issuer
Bioverativ Inc.
Common Stock
2018-03-08−6,693→ 0 total
Disposition to Issuer
Bioverativ Inc.
Non-Qualified Stock Option
2018-03-08−26,818→ 0 total
Disposition to Issuer
Bioverativ Inc.
Restricted Stock Units
2018-03-08−6,364→ 0 total
Disposition to Issuer
Bioverativ Inc.
Non-Qualified Stock Option
2018-03-08−2,980→ 0 total
Award
Bioverativ Inc.
Restricted Stock Units
2018-01-31+6,364→ 6,364 total
Disposition to Issuer
ARCH CAPITAL GROUP LTD.$ACGL
Series C Non-Cumulative Preferred Shares (non-convertible)
2018-01-02$25.00/sh−2,146→ 0 total
Disposition to Issuer
ARCH CAPITAL GROUP LTD.$ACGL
Series C Non-Cumulative Preferred Shares (non-convertible)
2017-09-25$25.00/sh−695→ 2,146 total
Disposition to Issuer
ARCH CAPITAL GROUP LTD.$ACGL
Series C Non-Cumulative Preferred Shares (non-convertible)
2017-09-18$25.00/sh−4,659→ 2,841 total
Purchase
Bioverativ Inc.
Common Stock
2017-08-09$59.19/sh+1,000→ 6,693 total
Sale
BIOGEN INC.$BIIB
Common Stock
2017-06-09$256.31/sh−1,084→ 6,330 total
Award
BIOGEN INC.$BIIB
Common Stock
2017-06-07+1,055→ 7,414 total
Purchase
Bioverativ Inc.
Common Stock
2017-05-24$53.90/sh+1,300→ 4,993 total

Posner Brian S

Recent Transactions

Companies

Recent Filings

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