Markel Group Executes Major Adverse Development Cover Agreement with Enstar Subsidiary

Executive Summary

On October 27, 2026, Markel Group Inc. subsidiaries entered into an Adverse Development Cover (ADC) Agreement with Cavello Bay Reinsurance Limited, a wholly owned subsidiary of Enstar Group Limited. The agreement transfers reserve risk associated with Markel's run-off Global Reinsurance portfolio and specific exited lines within its insurance segment, encompassing $4.8 billion in net reserves.

Key Terms & Structure

• Retention & Layering: Reinsurance attaches after an aggregate retention of $2.6 billion of covered losses paid on or after April 1, 2026. The contract covers $2.3 billion of the existing reserves and up to $1.2 billion of adverse development above those reserves (for a total capacity of $3.5 billion).
• Premium & Funding: Ceding companies will pay a reinsurance premium of $2.4 billion, satisfied via asset transfers at closing. $500 million will be transferred to the Reinsurer directly, while the remaining balance will be placed into a collateral trust account to secure the Reinsurer's obligations.
• Operational Governance: Markel subsidiaries retain claims handling control subject to agreed claims administration protocols.
• Timing: Closing is anticipated by the end of Q4 2026, subject to customary closing conditions and regulatory approvals.

Strategic and Financial Implications

This transaction materially reduces legacy reserve volatility for Markel Group by capping adverse development exposure on run-off reinsurance and exited lines. While Markel cedes $2.4 billion in assets, it strengthens balance sheet certainty and capital efficiency across its continuing core specialty insurance businesses.