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Brian S. Posner Insider Profile
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Brian S. Posner, Director at Arch Capital Group, holds 128.10K shares in Arch Capital Group (Ticker: ACGL), holds 8.18K shares in Biogen (Ticker: BIIB), holds 0.00 shares in Bioverativ Inc (Ticker: BIVV). Most recently, Brian S. Posner Bought ― shares of Arch Capital Group on Aug 04, 2025 for an estimated value of $17.33K.
Profitable Transactions
9 out of 10 Profitable Transactions
Average Return
+39.00%
Average return per transaction
Time Frame
Compare to
Insider Holdings
Insider Roles
Roles that Brian S. Posner holds in companies
Most Profitable Insider Trade
The most profitable trade made by Brian S. Posner
Brian S. Posner's Trading History
Arch Capital Group
Aug 04, 2025
Director
Informative Buy
17.33K
$11.52M
Bioverativ Inc
Mar 08, 2018
―
Uninformative Sell
―
$0.00
Biogen
Jul 02, 2021
Director
Uninformative Buy
―
$1.11M
LMP Capital and Income Fund Inc
―
Officer of the Adviser
―
$76.40K
BG Medicine
Nov 20, 2012
Director
Informative Buy
11.60K
―
List of latest transactions for each holding click on a transaction to see Brian S. Posner's performance on stock
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Brian S. Posner insider profile FAQ
What is the percentage of profitable transactions made by Brian S. Posner?
The percentage of profitable transactions made by Brian S. Posner is 90%.
What is the average return per transaction made by Brian S. Posner?
The average return per transaction made by Brian S. Posner is 39.00%.
What stocks does Brian S. Posner hold?
Brian S. Posner holds: ACGL, BIVV, BIIB, SCD, BGMD stocks.
What was Brian S. Posner’s latest transaction?
Brian S. Posner latest transaction was an Informative Buy of $17.33K.
What was Brian S. Posner's most profitable transaction?
Brian S. Posner’s most profitable transaction was an Informative Buy of ACGL stock on May 15, 2020. The return on the trade was 74.80%.
What is Brian S. Posner's role in Arch Capital Group?
Brian S. Posner's role in Arch Capital Group is Director.
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