O'Brien Frances D. 4

What Happened
Frances D. O'Brien, Chief Risk Officer of Chubb Ltd (CB), had 52 common shares withheld to satisfy tax withholding related to an equity award or option exercise. The shares were valued at $337.92 each, for a total withholding of approximately $17,572. This is a tax-withholding disposition (routine administrative action), not an open-market sale or purchase.

Key Details

• Transaction date: 2026-02-26; Price per share: $337.92; Shares withheld/disposed: 52; Total value ≈ $17,572.
• Transaction code: F — common shares withheld to pay tax liability (net share settlement).
• Shares owned after the transaction: not included in the provided excerpt of the filing.
• Filing date: 2026-03-02. This appears to be filed within the standard two business-day Form 4 window (timely).
• Footnote: F1 — "Common Shares withheld to pay tax liability."

Context
Withholding shares to cover taxes is a standard administrative step following an award vesting or option exercise and typically does not signal a deliberate sale or market-timing decision by the insider. Because shares were withheld (net settlement), no open-market sale occurred; the transaction reduces the insider's reported share count by the withheld amount.