White Mountains Insurance Group Sees Major Growth in 2025

White Mountains Insurance Group Ltd., a prominent player in the insurance industry based in Bermuda, experienced significant growth in its property and casualty reinsurance sector, Ark/WM Outrigger. Their gross written premiums soared to $2.5 billion in 2025, reflecting an increase from $2.2 billion in 2024, as reported by Reinsurance News. This impressive growth highlights the company's robust underwriting strategies and effective risk management practices.

The Ark unit also reported a pre-tax net income of $265 million in 2025, marking a rise from $253 million in the previous year. This financial performance underscores White Mountains Insurance Group's strong positioning in meeting regulatory compliance requirements and adapting to evolving market demands. Business Insurance remains an essential resource for professionals focusing on regulatory insights and financial strategies within the industry.