ACGL vs MRSH: Correlation
How closely do Arch Capital Group (ACGL) and Marsh McLennan (MRSH) trade together? Their weekly returns over three years give a correlation of 0.60, which is strong.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are ACGL and MRSH?
On 3 years of weekly data the ACGL/MRSH correlation comes out at 0.60, strong. The relationship has been stable: the 1-year correlation (0.61) sits close to the 3-year figure. The 5-year figure is 0.53, and annualized covariance runs at 232.0 %².
Within ACGL's tracked universe of 36 assets, MRSH comes in at #9 by 3-year correlation. The trailing year gives ACGL the advantage: +7.7% versus -6.0%, a 13.7-point spread. The rolling one-year correlation moved between 0.47 and 0.72 over the past three years, a moderate range.
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 MRSH: side by side
| ACGL (Arch Capital Group) | MRSH (Marsh McLennan) | |
|---|---|---|
| 1-year return | +7.7% | -6.0% |
| 5-year return | +151.8% | +31.3% |
| Volatility (ann.) | 21.5% | 18.1% |
| Beta vs S&P 500 | 0.28 | 0.33 |
| Max drawdown (3Y) | -22.4% | -34.4% |
| Market cap | $33.7B | $90.7B |
| P/E (trailing) | 7.9 | 23.6 |
| Dividend yield | 0.00% | 1.91% |
| Sector / category | Financials | Financials |
Year-by-year returns
| Year | ACGL | MRSH |
|---|---|---|
| 2022 | +41.2% | -3.5% |
| 2023 | +18.3% | +16.1% |
| 2024 | +30.8% | +13.7% |
| 2025 | +3.9% | -11.3% |
| 2026 | +3.0% | +4.0% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are ACGL and MRSH good diversifiers for each other?
Only partially. A correlation of 0.60 means ACGL and MRSH share most of their swings. Pairing them dampens volatility somewhat, but it will not protect against a common drawdown.
FAQ
What is the correlation between ACGL and MRSH?
The ACGL/MRSH correlation stands at 0.60 on a 3-year window (1 year: 0.61, 5 years: 0.53), computed from weekly returns as of 2026-08-27.
Is MRSH a good diversifier for ACGL?
Only partially. A correlation of 0.60 means ACGL and MRSH share most of their swings. Pairing them dampens volatility somewhat, but it will not protect against a common drawdown.
What does a correlation of 0.60 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 · MRSH correlations
