---
schema_version: "secwatch.filing_event.v1"
accession: "0000947484-24-000060"
form_type: "8-K"
ticker: "ACGL"
cik: "0000947484"
company_name: "ARCH CAPITAL GROUP LTD."
filed_at: "2024-04-29T23:59:59+00:00"
generated_at: "2026-06-03T06:07:44.992276+00:00"
event_type: "earnings"
sentiment: "positive"
materiality_score: 0.85
calibrated_materiality_score: 0.85
confidence: "high"
source: SEC EDGAR
---

# Arch Capital Q1 net income $1.1B ($2.92/sh) vs $705M ($1.87) YoY; combined ratio improves to 78.8%

## Summary
- Net income available to common shareholders $1.1B, $2.92 per diluted share vs $705M, $1.87 in Q1 2023.
- After-tax operating income $933M ($2.45/sh) vs $654M ($1.73) YoY; annualized operating ROE 20.7%.
- Gross premiums written $5.93B (+24.1% YoY); net premiums earned $3.42B (+18.7%).
- Combined ratio 78.8% (ex-cat & prior-year dev: 80.8%) vs 80.6% a year ago; underwriting income $736M.
- Book value per share $49.36, up 5.2% from Dec 31, 2023; favorable prior-year reserve development $126M.

## SEC filing metadata
- accession: 0000947484-24-000060
- form_type: 8-K
- ticker: ACGL
- cik: 0000947484
- company_name: ARCH CAPITAL GROUP LTD.
- filed_at: 2024-04-29T23:59:59+00:00
- event_type: earnings
- sentiment: positive
- materiality_score: 0.85
- calibrated_materiality_score: 0.85
- confidence: high
- sec_items: 2.02, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/947484/000094748424000060/0000947484-24-000060-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/947484/000094748424000060/acgl-20240429.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0000947484-24-000060
- JSON: https://secwatch.observer/filing/0000947484-24-000060.json
- Plain text: https://secwatch.observer/filing/0000947484-24-000060.txt

## Key facts
- Earnings Releases
  ARCH CAPITAL GROUP LTD. reported financial results for the quarter ended March 31, 2024.
  - Period: the quarter ended March 31, 2024
  - Result: reported results
  source text: On April 29, 2024, Arch Capital Group Ltd. issued a press release reporting its earnings and the availability of its financial supplement for the quarter ended March 31, 2024.
  evidence_url: https://www.sec.gov/Archives/edgar/data/947484/000094748424000060/0000947484-24-000060-index.htm

This AI-assisted summary is a reading aid. Review the linked SEC EDGAR filing before relying on any specific claim.