Brian Posner

Track

Insider profile

Currently holds positions in Biogen Inc and Arch Capital Group Ltd

Performance

Overall performance
3.8
Performance over holding periods
3.8
30 days 90 days 120 days
Average return 23% 8.2% 15.1%
Success rate 89% 68% 82%
Transactions
10 100% Buy
34 71% Buy
47 69% Buy
Ranking by holding-period performance

Positions

Position Company Period
Independent Director Biogen Inc July 23, 2008 -
Independent Director Arch Capital Group Ltd Nov. 4, 2010 -
Independent Chairman of the Board Bioverativ Inc Jan. 1, 2017 - March 8, 2018
Brian Posner's trades of Dyne Therapeutics Inc's stock


• Purchase • Sale • Planned purchase • Planned sale Net purchase Net sale Buy signal Sell signal Earnings
Abbreviations B: Buy, S: Sell, PP: Planned purchase, PlS: Planned sale, PrS: Proposed sale, O: Option / Other
Transaction date
Purchase
Price
106.75
Quantity 27,396 +2.3%
Value US$3,221,147
Transaction date
Purchase
Price
202.57
Quantity 56,531 +31.2%
Value US$4,422,775
Transaction date
Purchase
Price
203.88
Quantity 43,679 -23.1%
Value US$1,594,837
Transaction date
Purchase
Price
17.48
Quantity 2,500 +12.5%
Value US$43,700
Transaction date
Purchase
Price
18.21
Quantity 2,000 +11.1%
Value US$36,420
Transaction date
Purchase
Price
17.12
Quantity 2,500 +16.1%
Value US$42,800
Transaction date
Purchase
Price
19.35
Quantity 2,000 +17.4%
Value US$38,700
US Biogen Inc (BIIB)
Transaction date
Planned sale
Price
274.17
Quantity 360 -4.6%
Value US$98,701
Transaction date
Purchase
Price
22.16
Quantity 1,000 +1.0%
Value US$22,159
Notification date Transaction date Company B/S Transaction type Nb. shares
Price
Value 		Number of shares Price Value Details
2026-10-06 2026-10-02
B Purchase
27,396 +2.3%
106.75
US$3,221,147 		27,396 +2.3% 106.75 US$3,221,147
2026-06-09 2026-06-08
B Purchase
56,531 +31.2%
202.57
US$4,422,775 		56,531 +31.2% 202.57 US$4,422,775
2026-06-05 2026-06-03
B Purchase
43,679 -23.1%
203.88
US$1,594,837 		43,679 -23.1% 203.88 US$1,594,837
2026-06-05 2026-06-03
B Purchase
2,500 +12.5%
17.48
US$43,700 		2,500 +12.5% 17.48 US$43,700
2026-06-04 2026-06-03
S Sale
3,000 -100.0%
19.66
US$58,980 		3,000 -100.0% 19.66 US$58,980
2026-05-28 2026-05-26
B Purchase
2,000 +11.1%
18.21
US$36,420 		2,000 +11.1% 18.21 US$36,420
2026-05-22 2026-05-20
B Purchase
2,500 +16.1%
17.12
US$42,800 		2,500 +16.1% 17.12 US$42,800
2026-05-12 2026-05-11
S Sale
2,000 -100.0%
17.14
US$34,283 		2,000 -100.0% 17.14 US$34,283
2026-04-01 2026-03-30
B Purchase
2,000 +14.8%
17.08
US$34,160 		2,000 +14.8% 17.08 US$34,160
2026-03-13 2026-03-11
B Purchase
2,000 +17.4%
19.35
US$38,700 		2,000 +17.4% 19.35 US$38,700
2026-03-12 2026-03-11
S Sale
3,000 -60.0%
17.12
US$51,345 		3,000 -60.0% 17.12 US$51,345
2026-03-10 2026-03-06
B Purchase
3,000 +35.3%
15.06
US$45,180 		3,000 +35.3% 15.06 US$45,180
2025-08-04 2025-08-01
B Purchase
1,000 +25.0%
17.34
US$17,338 		1,000 +25.0% 17.34 US$17,338
2022-11-01 2022-10-28
B Purchase
2,000 +100.0%
17.60
US$35,200 		2,000 +100.0% 17.60 US$35,200
2022-05-02 2022-04-29
B Purchase
2,000 +inf%
19.23
US$38,450 		2,000 +inf% 19.23 US$38,450
2021-06-15 2021-06-14
S Sale
4,000 -66.7%
25.24
US$100,971 		4,000 -66.7% 25.24 US$100,971
2021-06-07 2021-06-04
US Biogen Inc (BIIB)
PlS Planned sale
360 -4.6%
274.17
US$98,701 		360 -4.6% 274.17 US$98,701
2020-05-15 2020-05-13
B Purchase
1,000 +1.0%
22.16
US$22,159 		1,000 +1.0% 22.16 US$22,159
2020-05-08 2020-05-06
B Purchase
1,000 +1.1%
23.72
US$23,718 		1,000 +1.1% 23.72 US$23,718