Products & Services · Year One
Casualty — Year One
Arch Capital Group Casualty — Year One increased by 3.6% to 2.9% in Q4 2025 compared to the prior quarter. Year-over-year, this metric grew by 3.6%, from 2.8% to 2.9%.
Analysis
StatementSegment
CategoryEfficiency
SignalContext dependent
VolatilityModerate
First reportedQ4 2018
Last reportedQ4 2025
How to read this metric
Used to calibrate actuarial models; deviations from expected patterns indicate changes in claim frequency or severity.
Detailed definition
The loss development experience for the casualty segment during the first year following the initial underwriting year....
Peer comparison
Standard component of actuarial loss development triangles.
Metric ID:
acgl_segment_casualty_year_oneHistorical Data
5 periods
| Q4 '21 | Q4 '22 | Q4 '23 | Q4 '24 | Q4 '25 | |
|---|---|---|---|---|---|
| Value | 2.5% | 2.8% | 2.8% | 2.8% | 2.9% |
| QoQ Change | — | +12.0% | +0.0% | +0.0% | +3.6% |
| YoY Change | — | +12.0% | +0.0% | +0.0% | +3.6% |
Range2.5% – 2.9%
CAGR+16.0%
Avg YoY Growth+3.9%
Median YoY Growth+1.8%
Current Streak4+ quarters growth
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Frequently Asked Questions
- What is Arch Capital Group's casualty — year one?
- Arch Capital Group (ACGL) reported casualty — year one of 2.9% in Q4 2025.
- How has Arch Capital Group's casualty — year one changed year-over-year?
- Arch Capital Group's casualty — year one increased by 3.6% year-over-year, from 2.8% to 2.9%.
- What does casualty — year one mean?
- The claims experience for casualty policies in their first year of development.