ACGL vs WTM: Correlation
Arch Capital Group (ACGL) and White Mountains Insurance Group, Ltd. (WTM) show a moderate relationship: their 3-year correlation of weekly returns is 0.47.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are ACGL and WTM?
Across a 3-year window, the weekly returns of ACGL and WTM correlate at 0.47, moderate. Lately the two have drifted apart, with the 1-year correlation at 0.35 versus 0.47 over 3 years. Stretching to 5 years gives 0.45, with an annualized covariance of 208.6 %².
By 3-year correlation, WTM places #19 of the 36 assets tracked against ACGL. The trailing year gives WTM the advantage: +7.7% versus +15.3%, a 7.6-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 WTM: side by side
| ACGL (Arch Capital Group) | WTM (White Mountains Insurance Group, Ltd.) | |
|---|---|---|
| 1-year return | +7.7% | +15.3% |
| 5-year return | +151.8% | +90.5% |
| Volatility (ann.) | 21.5% | 20.6% |
| Beta vs S&P 500 | 0.28 | 0.23 |
| Max drawdown (3Y) | -22.4% | -18.0% |
| Market cap | $33.7B | $5.1B |
| P/E (trailing) | 7.9 | 4.9 |
| Dividend yield | 0.00% | 0.05% |
| Sector / category | Financials | US Listed |
Year-by-year returns
| Year | ACGL | WTM |
|---|---|---|
| 2022 | +41.2% | +39.6% |
| 2023 | +18.3% | +6.5% |
| 2024 | +30.8% | +29.3% |
| 2025 | +3.9% | +6.9% |
| 2026 | +3.0% | +2.4% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are ACGL and WTM good diversifiers for each other?
Reasonably. At 0.47, ACGL and WTM keep a meaningful degree of independence, and combining them has historically reduced portfolio volatility.
FAQ
What is the correlation between ACGL and WTM?
The ACGL/WTM correlation stands at 0.47 on a 3-year window (1 year: 0.35, 5 years: 0.45), computed from weekly returns as of 2026-08-27.
Is WTM a good diversifier for ACGL?
Reasonably. At 0.47, ACGL and WTM keep a meaningful degree of independence, and combining them has historically reduced portfolio volatility.
What does a correlation of 0.47 mean?
Correlation ranges from −1 to +1. Values near +1 mean two assets move together, near 0 that they move independently, and negative values that they tend to move in opposite directions. It measures co-movement, not performance.
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Related comparisons
Hubs: ACGL correlations · WTM correlations
