Posner Brian S

Posner Brian S is listed in filings as Director at Arch Capital Group Ltd. This profile follows SEC Form 4 activity through Jun 5, 2026, including sale activity and purchase activity. Recent filings connect the profile to Arch Capital Group Ltd (ACGL) and Dyne Therapeutics, Inc. (DYN). The current snapshot covers public activity from May 9, 2025 to Jun 5, 2026. Reported amounts are shown as $59.0K to $36.4K. The page organizes purchases, sales, issuer links, reported share activity, and filing evidence for review as public disclosure data.