Hamilton Insurance Group, Ltd. is a global specialty insurance and reinsurance provider that underwrites a diverse portfolio of property, casualty, and specialty risks. The company operates through two primary business segments: International and Bermuda. The International segment includes the Hamilton Global Specialty and Hamilton Select platforms, which write business out of Lloyd's Syndicate 4000 and subsidiaries in the UK, Ireland, and the US, focusing on specialty and excess and surplus (E&S) lines. The Bermuda segment operates primarily through Hamilton Re, providing treaty reinsurance and facultative placements.
Hamilton's business model is balanced between primary insurance and reinsurance, with its 2025 gross premiums written (GPW) of approximately $2.9 billion split evenly at 50% insurance and 50% reinsurance. By class of business, the 2025 GPW mix consisted of casualty (48%), specialty (28%), and property (24%). The company generates revenue through two main pillars: underwriting premiums from its specialty and reinsurance lines, and investment income. A distinctive element of Hamilton's strategy is its long-standing relationship with Two Sigma Investments, which manages the Two Sigma Hamilton Fund. This provides the company with a quantitative, data-driven investment strategy that complements its algorithmic underwriting approach. This dual focus on underwriting discipline and high-yield investment allocation allows Hamilton to navigate market cycles effectively and maintain strong capital efficiency.
