Arch Capital Group Ltd. (ACGL) - Stock Report

The key macro issue is not higher yields or insurance cyclicality in isolation, but whether catastrophe pricing, casualty reserves and mortgage credit pass cleanly through Arch’s combined ratio into book-value-per-share compounding; if they do, Arch can keep compounding capital, and if they do not, investment income and buybacks cannot fully protect underwriting value.

The latest quarter used here is fiscal Q4 2025, anchored to Source B's LatestQuarter 2025-12-31 and the 2026-02-09 reported date. Source B shows $2.98 of after-tax operating EPS, matching the company's operating EPS; the company release also shows reported net income available to Arch common shareholders of $1.2 billion, or $3.35 per diluted share. Net premiums written fell 4.5% year over year to $3.649 billion, net premiums earned rose 2.7% to $4.255 billion, single-quarter underwriting income rose 32.3% to $827 million, and the combined ratio improved to 80.6%; the combined ratio excluding catastrophic activity and prior year development was 79.5%.

For full-year 2025, net income available to Arch common shareholders was $4.359 billion, or $11.60 per diluted share, and after-tax operating income available to Arch common shareholders was $3.700 billion, or $9.84 per diluted share. Net cash provided by operating activities was $6.172 billion, purchases of fixed assets were $44 million, and repurchases plus common and preferred dividends were about $1.936 billion, leaving roughly $4.192 billion of cash after fixed assets and distributions.

Arch writes specialty insurance, reinsurance and mortgage insurance where pricing, risk selection, reserving and capital withdrawal matter more than volume. Insurance supplies specialty distribution, Reinsurance is the flexible capital-deployment lever, and Mortgage adds a housing-credit earnings stream with PMIERs as the constraint.

The current reporting taxonomy is Insurance, Reinsurance and Mortgage. Management measures segment performance on underwriting income; investment income, realized gains, equity-method income, corporate items, interest expense and tax are not allocated to underwriting segments. That matters because a quarter can look excellent at the reported EPS line while part of the result comes from investment/accounting gains rather than underwriting cash economics.

Management is prioritizing cycle-managed underwriting, book-value growth and buyback discipline. In Q4 2025, Arch repurchased $798 million of shares at an average price of $90.04; for full-year 2025 it repurchased $1.890 billion at an average $89.26. Repurchases are a value lever only if they are made below intrinsic value and do not weaken capital flexibility before catastrophe, casualty-reserve or mortgage-credit stress.