---
schema_version: "secwatch.filing_event.v1"
accession: "0000947484-26-000010"
form_type: "8-K"
ticker: "ACGL"
cik: "0000947484"
company_name: "ARCH CAPITAL GROUP LTD."
filed_at: "2026-02-09T23:59:59+00:00"
generated_at: "2026-05-16T04:01:19.063977+00:00"
event_type: "earnings"
sentiment: "positive"
materiality_score: 0.8
calibrated_materiality_score: 0.8
confidence: "high"
source: SEC EDGAR
---

# Arch Capital Q4 net income $1.2B ($3.35 EPS) vs $925M ($2.42) YoY; combined ratio 80.6%

## Summary
- Net income $1.2B ($3.35 diluted EPS) vs $925M ($2.42) in Q4 2024; after-tax operating income $1.1B ($2.98 EPS).
- Combined ratio 80.6% improved from 85.0% YoY; ex-cat and prior year development ratio 79.5% vs 79.0%.
- Book value per share $65.11, up 4.5% from Sept 30; share repurchases of $798M.
- Gross premiums written $4.8B (+1.1% YoY); net premiums earned $4.3B (+2.7%).

## SEC filing metadata
- accession: 0000947484-26-000010
- form_type: 8-K
- ticker: ACGL
- cik: 0000947484
- company_name: ARCH CAPITAL GROUP LTD.
- filed_at: 2026-02-09T23:59:59+00:00
- event_type: earnings
- sentiment: positive
- materiality_score: 0.8
- calibrated_materiality_score: 0.8
- confidence: high
- sec_items: 2.02, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/947484/000094748426000010/0000947484-26-000010-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/947484/000094748426000010/acgl-20260209.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0000947484-26-000010
- JSON: https://secwatch.observer/filing/0000947484-26-000010.json
- Plain text: https://secwatch.observer/filing/0000947484-26-000010.txt

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