PETRILLO LOUIS T 4

What Happened Louis T. Petrillo, an officer of an Arch Capital Group Ltd. subsidiary, received a grant/award of 17,136 common shares on February 24, 2026 (transaction code A). As part of the same transaction, 412 shares were disposed of (transaction code F) to cover tax withholding at $99.18 per share, generating proceeds of $40,862. The award shares were acquired at no cash cost to the reporting person (price shown $0.00).

Key Details

• Transaction date: 2026-02-24; Filing date (Form 4): 2026-02-26 (filed timely).
• Award: 17,136 shares (code A) acquired at $0.00.
• Tax withholding: 412 shares disposed (code F) at $99.18 each, totaling $40,862.
• Footnote F1: Amount includes 248 common shares acquired May 30, 2025 under Arch’s Employee Share Purchase Plan.
• Footnote F2: Some shares are owned by the reporting person’s step-sons who share his household (beneficial ownership note).
• Shares owned after the transaction: not specified in the summary data from the filing.

Context This filing reflects a compensation-related award (an acquisition) with a routine tax-withholding disposition of shares — not an open-market sale. Tax withholding dispositions (code F) are common when equity awards vest and do not necessarily signal an intent to sell for investment reasons.