Markel Insurance and Enstar announced on October 28, 2026, that they have entered into an adverse development cover reinsurance agreement covering a portfolio of Markel's run-off global reinsurance business and certain exited insurance lines.

Key Highlights

  • Subject reserves: The ADC reinsurance agreement includes subject reserves of $4.8 billion covering 2025 and prior underwriting years.
  • Retention and retrocession: Markel will retain the first $2.6 billion of subject reserves and retrocede the next $2.3 billion to Enstar.
  • Adverse development coverage: Markel will obtain adverse loss development coverage of $1.2 billion above the $4.8 billion of subject reserves.
  • Risk premium: Markel will pay Enstar a risk premium of $120 million under the transaction terms.
  • Expected net impact: According to the filing, Markel expects the net impacts of the transaction to have an immaterial impact on underwriting results in the fourth quarter.
  • Counterparty: Coverage will be provided by Cavello Bay Reinsurance Limited, Enstar's wholly owned subsidiary, which carries an S&P 'A' financial strength rating.
  • Expected closing: The transaction is expected to close by the end of the fourth quarter of 2026, subject to regulatory approval and other customary conditions.

Markel and Enstar Structure ADC Agreement on Run-Off Reinsurance Portfolio

Markel Insurance, the insurance operations within Markel Group Inc. (NYSE:MKL), disclosed on October 28, 2026, that it has entered into an adverse development cover reinsurance agreement with Enstar. According to the filing, the agreement covers Markel's run-off global reinsurance business and certain exited lines within its insurance operations, specifically the Global Reinsurance division and exited risk-managed professional liability, architects and engineers, and other run-off lines within its global insurance operations.

The filing states that the ADC includes subject reserves of $4.8 billion. Under the terms disclosed, Markel retains the first $2.6 billion of those reserves and retrocedes the next $2.3 billion to Enstar. In addition, Markel obtains $1.2 billion of adverse loss development coverage above the $4.8 billion subject reserve amount. In exchange, Markel will pay Enstar a risk premium of $120 million. The filing notes that Markel will maintain claims control throughout the arrangement.

The coverage will be provided through Cavello Bay Reinsurance Limited, described in the filing as Enstar's wholly owned subsidiary and an S&P 'A' financial strength rated reinsurance platform. The filing includes a statement from Simon Wilson, Chief Executive Officer of Markel Insurance, that "this transaction provides additional certainty as these liabilities continue to run off and allows us to continue our focus on growing our core specialty insurance business." The company disclosed that forward-looking statements in the release, including expectations regarding timing, regulatory approval, and ultimate losses, are subject to risks and uncertainties as described in the filing's cautionary language.

What Was Disclosed

Markel Group Inc. (NYSE:MKL) disclosed an adverse development cover reinsurance agreement with Enstar covering $4.8 billion in subject reserves from run-off reinsurance and exited insurance lines, with a $120 million risk premium and $1.2 billion of adverse development coverage above subject reserves, expected to close by end of fourth quarter 2026.