Brian S Posner

Director, Dyne Therapeutics, Inc.; Director, Arch Capital Group

Bought, 12 months

$0.3M

Sold, 12 months

$0.1M

Companies

Latest trade

Oct 2, 2026

Companies

Dyne Therapeutics, Inc.Director +$0.3M Arch Capital GroupDirector −$0.1M

Trades

DYN Bought 2,500 shares at $16.00 $0.0M Oct 2

DYN Bought 2,000 shares at $16.94 $0.0M Jun 8

ACGL Sold 3,000 shares at $19.66 $0.1M Jun 3

DYN Bought 2,500 shares at $17.48 $0.0M Jun 3

DYN Bought 2,000 shares at $18.21 $0.0M May 26

DYN Bought 2,500 shares at $17.12 $0.0M May 20

ACGL Sold 2,000 shares at $17.14 $0.0M May 11

DYN Bought 2,000 shares at $17.08 $0.0M Mar 30

ACGL Sold 3,000 shares at $17.12 $0.1M Mar 11

DYN Bought 2,000 shares at $19.35 $0.0M Mar 11

DYN Bought 3,000 shares at $15.06 $0.0M Mar 6

Open-market trades from SEC Form 4 only: no grants, option exercises or gifts. People are matched by the name on their filings, so two people with the same name share this page. For information only — not investment advice.