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Transactions with Related Parties
 12 Months Ended
Dec. 31, 2025
Related Party Transactions [Abstract]  
Transactions with Related Parties
In 2017, the Company acquired approximately 25% of Premia. Premia is the parent of Premia Reinsurance Ltd., a multi-line Bermuda reinsurance company. Premia’s strategy is to reinsure or acquire companies or reserve portfolios in the non-life property and casualty insurance and reinsurance run-off market. Arch Re Bermuda and certain Arch co-investors invested $100 million and acquired approximately 25% of Premia as well as warrants to purchase additional common equity. Arch has appointed two directors to serve on the seven person board of directors of Premia. Arch Re Bermuda is providing a quota share reinsurance treaty on certain business written by Premia, and subsidiaries of Arch Capital are providing certain administrative and support services to Premia, in each case pursuant to separate multi-year agreements. During the 2025 and 2024 periods, the Company did not enter into any new reinsurance transactions with Premia. At December 31, 2025, the Company recorded a funds held asset from Premia of $124 million, compared to $137 million at December 31, 2024.
Somers is wholly owned by Greysbridge, and Greysbridge is owned 30% by the Company with the remaining interests held by third party investors. The Company entered into certain reinsurance transactions with Somers. During 2025, 2024 and 2023 periods, the Company’s net premiums written was reduced by $705 million, $738 million and $574 million, respectively. In addition, Somers paid certain acquisition costs and administrative fees to the Company. At December 31, 2025, the Company recorded a reinsurance recoverable on unpaid and paid losses from Somers of $2.0 billion and a reinsurance balance payable to Somers of $550 million. At December 31, 2024, reinsurance recoverable on unpaid and paid losses from Somers was $1.6 billion, with a reinsurance balance payable to Somers of $489 million.
Pursuant to the terms of the Greysbridge shareholder agreement, as amended, following the expiration of a specified period, Arch Capital has a call right (but not the obligation) and certain third party investors have put rights (but not the obligation) to purchase or sell, as applicable, a specified amount of each such investor’s initial common shares on an annual basis at Greysbridge’s year-end book value per share. Obligations under put/call option notices are recognized on the Company’s balance sheet in both other assets and other liabilities. At December 31, 2025, the Company’s balance sheet included $162 million in both other assets and other liabilities for such put notices. Transactions related to the put shares are expected to close in the 2026 calendar year, subject to any regulatory approval.
During the 2024 period, the Company completed the acquisition of Watford Insurance Company from Somers for a total consideration paid of $35 million.
As of December 31, 2025, the Company owned $35 million in aggregate principal amount of Somers 6.5% senior notes, due July 2, 2029.