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Insiders · Profile

Posner Brian S

Director at Dyne Therapeutics · Director at Arch Capital · Director at Biogen · and 1 more. Filing since 11 Oct 2006. CIK 0001372455

DYN Dyne Therapeutics, Inc. Director · 8 trades ACGL Arch Capital Group Director · 16 trades BIIB Biogen Director · 14 trades SCD LMP CAPITAL & INCOME FUND INC. Officer of the Adviser · 1 trade
Company
Date
Role
Action
Shares
Amount
Of holding
DYN Dyne Therapeutics, Inc.
2 Oct 2026
Director
Bought
2,500
$40.00K
10.2%
DYN Dyne Therapeutics, Inc.
8 Jun 2026
Director
Bought
2,000
$33.88K
8.9%
ACGL Arch Capital Group
3 Jun 2026
Director
Sold at will
3,000
$58.98K
100%
DYN Dyne Therapeutics, Inc.
3 Jun 2026
Director
Bought
2,500
$43.70K
12.5%
DYN Dyne Therapeutics, Inc.
26 May 2026
Director
Bought
2,000
$36.42K
11.1%
DYN Dyne Therapeutics, Inc.
20 May 2026
Director
Bought
2,500
$42.80K
16.1%
ACGL Arch Capital Group
11 May 2026
Director
Sold at will
2,000
$34.28K
100%
DYN Dyne Therapeutics, Inc.
30 Mar 2026
Director
Bought
2,000
$34.16K
14.8%
ACGL Arch Capital Group
11 Mar 2026
Director
Sold at will
3,000
$51.35K
60.0%
DYN Dyne Therapeutics, Inc.
11 Mar 2026
Director
Bought
2,000
$38.70K
17.4%
DYN Dyne Therapeutics, Inc.
6 Mar 2026
Director
Bought
3,000
$45.18K
35.3%
ACGL Arch Capital Group
1 Aug 2025
Director
Bought
1,000
$17.34K
25.0%
ACGL Arch Capital Group
28 Oct 2022
Director
Bought
2,000
$35.20K
100%
ACGL Arch Capital Group
29 Apr 2022
Director
Bought
2,000
$38.45K
opened
ACGL Arch Capital Group
14 Jun 2021
Director
Sold, plan not stated
4,000
$100.97K
66.7%
BIIB Biogen
4 Jun 2021
Director
Sold, plan not stated
360
$98.70K
4.6%
ACGL Arch Capital Group
13 May 2020
Director
Bought
1,000
$22.16K
1.0%
ACGL Arch Capital Group
6 May 2020
Director
Bought
1,000
$23.72K
1.1%
BIIB Biogen
2 Dec 2019
Director
Sold, plan not stated
1,055
$308.43K
13.1%
ACGL Arch Capital Group
28 Nov 2018
Director
Bought
500
$14.12K
0.6%
ACGL Arch Capital Group
28 Nov 2018
Director
Bought
500
$10.93K
20.0%
ACGL Arch Capital Group
5 Nov 2018
Director
Bought
2,500
$56.12K
opened
ACGL Arch Capital Group
3 May 2018
Director
Bought
3,000
$235.88K
13.4%
BIIB Biogen
9 Jun 2017
Director
Sold, plan not stated
1,084
$277.84K
14.6%
ACGL Arch Capital Group
18 Nov 2016
Director
Bought
6,000
$131.27K
opened
BIIB Biogen
22 Jun 2015
Director
Sold, plan not stated
470
$195.05K
8.2%
BIIB Biogen
15 Jun 2015
Director
Sold, plan not stated
400
$154.66K
6.5%
BIIB Biogen
20 Jun 2014
Director
Sold, plan not stated
605
$190.58K
9.2%
BIIB Biogen
13 Jun 2014
Director
Sold, plan not stated
700
$217.35K
9.6%
BIIB Biogen
31 Mar 2014
Director
Sold, plan not stated
3,000
$890.28K
31.8%
ACGL Arch Capital Group
19 Aug 2013
Director
Bought
2,500
$58.95K
50.0%
ACGL Arch Capital Group
2 Aug 2013
Director
Bought
5,000
$126.23K
opened
BIIB Biogen
11 Jun 2013
Director
Sold, plan not stated
2,020
$443.63K
19.9%
BIIB Biogen
18 Mar 2013
Director
Sold, plan not stated
4,500
$786.65K
30.7%
BIIB Biogen
7 Jun 2012
Director
Sold, plan not stated
2,500
$337.50K
16.5%
BIIB Biogen
4 Jun 2012
Director
Sold, plan not stated
2,400
$303.48K
16.0%
BIIB Biogen
29 Aug 2011
Director
Sold, plan not stated
15,000
$1.39M
54.3%
BIIB Biogen
25 May 2011
Director
Sold, plan not stated
25,975
$2.44M
72.7%
SCD LMP CAPITAL & INCOME FUND INC.
11 Oct 2006
Officer of the Adviser
Bought
5,000
$89.75K
opened
39 decisions on file.