Arch Capital Group Ltd.

Arch Capital Group Ltd. is a Bermuda-domiciled specialty insurer and reinsurer that also operates one of the largest private mortgage insurance franchises in the United States, generating $19.9 billion in total revenue in fiscal 2025. Founded in the aftermath of the 2001 insurance capacity crunch and built through a combination of organic underwriting expansion and opportunistic acquisitions — most recently the Allianz U.S. mid-market and entertainment business in August 2024 — Arch now writes roughly $16.5 billion in net premiums annually across three segments: Insurance, Reinsurance, and Mortgage.

This is a story about a company that has earned the right to be analysed differently from most P&C insurers. In an industry where the cycle usually dictates the narrative, Arch's consistent mid-80s combined ratios, a mortgage insurance subsidiary that has produced over $1 billion in underwriting income for four consecutive years, and a demonstrated willingness to return excess capital aggressively — $1.9 billion in share repurchases in FY2025, a further $1.95 billion in the first half of 2026 — have created a compounding machine that the market continues to price like a cyclical. The central question is whether the emerging soft market in property and short-tail lines will disrupt that machine, or whether Arch's three-legged structure and cycle-management discipline allow it to compound through the downturn as it has through the upturn.

The file turns on a narrower question than "is Arch a good company" — it manifestly is. The real debate is whether the current multiple, roughly 7.7 times trailing net income and 1.6 times book value, adequately discounts the risk that net income has peaked for the cycle, or whether the buyback math at these levels overwhelms whatever cyclical compression lies ahead.