Arch Capital Group Ltd.

Arch Capital Group Ltd. is a Bermuda-based specialty insurance and reinsurance holding company that writes property, casualty and mortgage risk worldwide through three underwriting platforms — insurance, reinsurance and mortgage. Founded in September 2000 and capitalised in 2001 with a $763.2 million equity infusion deliberately left free of pre-2002 liabilities, it now writes roughly $16.5 billion of net premiums a year and reported $19,929 million of total revenue and $4,359 million of net income available to common shareholders in fiscal 2025.

This is a story about the turn of an underwriting cycle, and what a self-described disciplined operator does when the easy pricing stops. Arch spent 2021 through 2024 in one of the best hard markets the industry has seen: property-catastrophe rates roughly doubled, net income return on average common equity ran above 20%, and book value per share compounded at more than 20% a year through 2025. That market is now over. At the 1 January 2026 renewals, property catastrophe and short-tail excess-of-loss rates fell 10% to 20%, and management opened the year with what it called "measured optimism" and a warning that competition was increasing across several lines. The stock has responded accordingly: at $99.52 on 4 August 2026 it trades at 1.46 times book value and about 7.2 times trailing earnings, a multiple that embeds a real fear that the earnings base is about to fall.

The question the file turns on is not whether Arch is a good company — a 25-year record of compounding book value per share at more than 15% a year answers that — but whether a playbook built on cycle management can keep returns respectable when the cycle rolls over, and whether three businesses that are all currently working can carry the group through a soft market together.