AON vs BRO: Correlation
How closely do Aon plc (AON) and Brown & Brown (BRO) 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 AON and BRO?
Across a 3-year window, the weekly returns of AON and BRO correlate at 0.60, strong. Little has changed lately, as the 1-year reading of 0.63 lands near the 3-year figure. Stretching to 5 years gives 0.66, with an annualized covariance of 318.3 %².
BRO is one of the assets that tracks AON most closely: it ranks #3 out of the 32 assets we track against AON. The last year tells two different stories: AON led by 20.4 percentage points, -4.6% for AON against -25.0% for BRO. The rolling one-year correlation stayed in a tight band between 0.44 and 0.69 over the past three years, which points to a structural rather than episodic relationship.
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.
AON vs BRO: side by side
| AON (Aon plc) | BRO (Brown & Brown) | |
|---|---|---|
| 1-year return | -4.6% | -25.0% |
| 5-year return | +27.0% | +27.5% |
| Volatility (ann.) | 21.7% | 24.4% |
| Beta vs S&P 500 | 0.34 | 0.39 |
| Max drawdown (3Y) | -24.2% | -55.8% |
| Market cap | $74.2B | $23.9B |
| P/E (trailing) | 19.5 | 23.3 |
| Dividend yield | 0.86% | 0.89% |
| Sector / category | Financials | Financials |
Year-by-year returns
| Year | AON | BRO |
|---|---|---|
| 2022 | +0.6% | -18.4% |
| 2023 | -2.3% | +25.7% |
| 2024 | +24.5% | +44.3% |
| 2025 | -1.2% | -21.4% |
| 2026 | -0.5% | -9.7% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are AON and BRO good diversifiers for each other?
Somewhat, no more. With 0.60 correlation, most large moves hit both names, and the diversification benefit stays modest.
FAQ
What is the correlation between AON and BRO?
Using weekly returns as of 2026-08-27: 0.60 over 3 years, with 0.63 over the last year and 0.66 over 5 years.
Is BRO a good diversifier for AON?
Somewhat, no more. With 0.60 correlation, most large moves hit both names, and the diversification benefit stays modest.
What does a correlation of 0.60 mean?
A reading of 0.60 sits on a scale from −1 (opposite moves) through 0 (unrelated) to +1 (identical moves). Correlation captures direction, not magnitude or performance.
Use this data
$ curl https://www.pairbook.io/api/v1/pairs/aon-vs-bro.json
Drop this badge in a README or notebook; it updates with the data:
[](https://www.pairbook.io/pair/aon-vs-bro/)
Free with attribution; caching and terms are described in the API documentation.
Related comparisons
Hubs: AON correlations · BRO correlations
