Key Highlights

  • Arch Capital Group reported after-tax operating income of USD 910 million, or USD 2.67 per share, ahead of consensus estimates.
  • Net premiums written declined 3.0% year over year to USD 3.85 billion across the company's three segments.
  • The combined ratio widened to 82.5% from 79.8% a year earlier, reflecting a different mix of catastrophe related costs.
  • Arch Capital repurchased USD 1.4 billion of shares during the quarter while book value per share held near USD 67.90.

Operating Earnings Beat Estimates as Premium Growth Slows

Arch Capital Group (NASDAQ:ACGL) reported third quarter net income available to common shareholders of USD 1.0 billion, or USD 3.00 per diluted share, compared with USD 1.3 billion, or USD 3.56 per share, in the same period of 2025. After tax operating income available to common shareholders was USD 910 million, or USD 2.67 per diluted share, representing a 16.0% annualized operating return on average common equity.

Net premiums written across the company's insurance, reinsurance and mortgage segments declined 3.0% year over year to USD 3.85 billion. The insurance segment posted net premiums written of USD 2.0 billion, up 2.7% from the prior year period, while overall premium volume softened across the broader portfolio.

Underwriting Margins Narrow Amid Catastrophe Activity

The combined ratio widened to 82.5% in the third quarter from 79.8% a year earlier, while the combined ratio excluding catastrophic activity and prior year development was 81.2%, compared with 80.5% in the prior year period. The company recorded USD 179 million of favorable development in prior year loss reserves, net of related adjustments, during the quarter.

The insurance segment's combined ratio rose to 94.4%, reflecting a different mix of underwriting results across the company's three reportable segments. Book value per common share stood at USD 67.90 at the end of the quarter, down 0.2% from the prior quarter end, as share repurchases of USD 1.4 billion offset underwriting and investment income contributions to equity.

Capital Returns and Segment Considerations

Arch Capital's pace of share repurchases, at USD 1.4 billion for the quarter, continued alongside the modest sequential decline in book value per share. Insurance segment premium growth of 2.7% contrasted with declines in net premiums written at the consolidated level, suggesting uneven conditions across lines of business as the broader market transitions.

A continuation of softer reinsurance and mortgage premium volume could further pressure top line growth, while additional favorable reserve development or a moderation in catastrophe losses could support combined ratio stability in coming quarters. The company's three segment structure means results in one line of business can offset or amplify trends elsewhere in a given period.

Figures to Watch Next Quarter

Net premiums written trends across the insurance, reinsurance and mortgage segments, the pace of share repurchases relative to book value per share, and the combined ratio excluding catastrophic activity are among the metrics that may inform how the fourth quarter is assessed against this quarter's 81.2% underlying result. Arch marked its 25th year of operations during the quarter, a milestone the company referenced alongside its underwriting results.