Arch Capital Subsidiary Amends $700M Letter of Credit Facility Agreement

Summary of Material Event

On October 28, 2026, Arch Reinsurance Ltd. ("ArchRe"), a wholly owned subsidiary of Arch Capital Group Ltd. (NASDAQ: ACGL), entered into Amendment No. 6 to Letter of Credit Facility Agreement with Lloyds Bank Corporate Markets plc acting as Administrative Agent and L/C Agent.

Key Terms & Modifications

• Facility Size: Maintains the base letter of credit facility size at $700,000,000.
• Availability Period Extension: Extends the final day of the Availability Period from May 31, 2026 to May 31, 2027.
• Underwriting Support: Formally extends the Letters of Credit to support Funds at Lloyd's for the 2027 underwriting year of account.
• Accordion Feature Expansion: Increases the maximum available Incremental Commitment capacity from $50,000,000 to $200,000,000 (an increase of $150,000,000).

Strategic & Financial Impact

This amendment represents a routine annual maintenance and extension of Arch Capital's syndicated letter of credit infrastructure supporting its Lloyd's syndicates (Managed Syndicate No. 2012 and Managed Syndicate No. 1955). The expanded accordion capacity offers Arch added capital flexibility to scale its Lloyd's underwriting operations if market conditions warrant.