ACGL vs RLI: Correlation
Measured on weekly returns over the past three years, Arch Capital Group (ACGL) and RLI Corp. (RLI) carry a correlation of 0.56, a moderate link.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are ACGL and RLI?
Over the past 3 years, ACGL and RLI moved with a correlation of 0.56, which is moderate. The relationship has been stable: the 1-year correlation (0.57) sits close to the 3-year figure. Over 5 years the correlation is 0.52, and the annualized covariance of weekly returns is 267.0 %².
Within ACGL's tracked universe of 36 assets, RLI comes in at #14 by 3-year correlation. The trailing year gives ACGL the advantage: +7.7% versus +1.9%, a 5.8-point spread.
How is this computed?
Pearson correlation on weekly returns: ρ(A,B) = cov(rA, rB) / (σA · σB), over windows of 52, 156 and 260 weeks. Covariance is annualized (×52) and expressed in %². Full definitions on the methodology page.
ACGL vs RLI: side by side
| ACGL (Arch Capital Group) | RLI (RLI Corp.) | |
|---|---|---|
| 1-year return | +7.7% | +1.9% |
| 5-year return | +151.8% | +46.7% |
| Volatility (ann.) | 21.5% | 22.2% |
| Beta vs S&P 500 | 0.28 | 0.18 |
| Max drawdown (3Y) | -22.4% | -43.5% |
| Market cap | $33.7B | $5.9B |
| P/E (trailing) | 7.9 | 13.5 |
| Dividend yield | 0.00% | 1.02% |
| Sector / category | Financials | US Listed |
Year-by-year returns
| Year | ACGL | RLI |
|---|---|---|
| 2022 | +41.2% | +24.8% |
| 2023 | +18.3% | +3.8% |
| 2024 | +30.8% | +27.6% |
| 2025 | +3.9% | -19.1% |
| 2026 | +3.0% | +5.1% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are ACGL and RLI good diversifiers for each other?
Somewhat, no more. With 0.56 correlation, most large moves hit both names, and the diversification benefit stays modest.
FAQ
What is the correlation between ACGL and RLI?
The ACGL/RLI correlation stands at 0.56 on a 3-year window (1 year: 0.57, 5 years: 0.52), computed from weekly returns as of 2026-08-27.
Is RLI a good diversifier for ACGL?
Somewhat, no more. With 0.56 correlation, most large moves hit both names, and the diversification benefit stays modest.
What does a correlation of 0.56 mean?
On the −1 to +1 scale, 0.56 describes how much the two returns move together: +1 is lockstep, 0 is independence, negative values mean opposite directions. It says nothing about which performed better.
Use this data
$ curl https://www.pairbook.io/api/v1/pairs/acgl-vs-rli.json
Markdown for the live badge, attribution link included:
[](https://www.pairbook.io/pair/acgl-vs-rli/)
No key needed, free to use. Full endpoint list in the API documentation.
Related comparisons
Hubs: ACGL correlations · RLI correlations
