Key Takeaways Arch Capital's Q3 operating income rose 39.2% year over year, beating estimates by 26.5%.Underwriting income surged 61.9% with a 680-basis-point improvement in the combined ratio.Higher premiums in Insurance and solid investment income offset weaker Reinsurance and Mortgage results.Arch Capital Group Ltd. (ACGL) reported third-quarter 2025 operating income of $2.77 per share, which beat the Zacks Consensus Estimate by 26.5%. The bottom line increased 39.2% year over year.The quarterly results ...