VOO vs. AON
VOO (Vanguard S&P 500 ETF) is S&P 500 fund tracking the S&P 500 Index, while AON (Aon plc) is a stock. Over the past 10 years, VOO returned 14.95%/yr vs 13.60%/yr for AON. Their 0.53 correlation means they have sometimes moved together and sometimes differently.
Performance
VOO vs. AON - Performance Comparison
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Returns By Period
In the year-to-date period, VOO achieves a 8.95% return, which is significantly higher than AON's 2.99% return. Over the past 10 years, VOO has outperformed AON with an annualized return of 14.95%, while AON has yielded a comparatively lower 13.60% annualized return.
VOO
- 1D
- 0.08%
- 1M
- 0.80%
- 6M
- 7.80%
- YTD
- 8.95%
- 1Y
- 17.35%
- 3Y*
- 19.06%
- 5Y*
- 12.51%
- 10Y*
- 14.95%
- ALL TIME*
- 14.72%
AON
- 1D
- 1.66%
- 1M
- 14.48%
- 6M
- 7.30%
- YTD
- 2.99%
- 1Y
- -2.12%
- 3Y*
- 2.62%
- 5Y*
- 10.12%
- 10Y*
- 13.60%
- ALL TIME*
- 11.72%
Liquidity Comparison
| Position | Avg. Volume Value (2W) | Avg. Volume Value (1M) | Avg. Volume Value (3M) |
|---|---|---|---|
AON Aon plc | $452.89M | $495.88M | $512.07M |
| $3.42B | $4.58B | $5.39B |
VOO vs. AON - Yearly Performance Comparison
| 2026 (YTD) | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | |
|---|---|---|---|---|---|---|---|---|---|---|
VOO Vanguard S&P 500 ETF | 8.95% | 17.82% | 24.98% | 26.32% | -18.17% | 28.79% | 18.32% | 31.37% | -4.50% | 21.77% |
AON Aon plc | 2.99% | -0.94% | 24.45% | -2.31% | 0.61% | 43.39% | 2.37% | 44.68% | 9.94% | 21.49% |
Correlation
The correlation between VOO and AON is -0.14, meaning they have often moved in opposite directions in the past. This relationship can weaken or reverse as market conditions change.
| Correlation | |
|---|---|
Correlation (1Y) Focuses on recent behavior, but can change the most. | -0.14 |
Correlation (3Y) Balances recent behavior with more history. | 0.13 |
Correlation (5Y) Shows whether the relationship held over a longer period. | 0.36 |
Correlation (10Y) Provides a long-term view across more market conditions. | 0.45 |
Correlation (All Time) Calculated using the full available price history since Sep 9, 2010 | 0.53 |
The correlation between VOO and AON shifts across timeframes, from -0.14 (1 year) to 0.53 (all time), reflecting how their relationship changes across market environments.
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Return for Risk
VOO vs. AON — Risk / Return Rank
VOO
AON
VOO vs. AON - Risk-Adjusted Trends Comparison
This table presents a comparison of risk-adjusted performance metrics for Vanguard S&P 500 ETF (VOO) and Aon plc (AON). Risk-adjusted metrics are performance indicators that assess an investment's returns in relation to its risk, enabling a more accurate comparison of different investment options.
Values are calculated on a 1-year rolling basis and updated daily. Risk-adjusted metrics are more stable over longer periods — use the period switch above to explore them.
| VOO | AON | Difference | |
|---|---|---|---|
| Sharpe ratioReturn per unit of total volatility | +1.33 | ||
| Sortino ratioReturn per unit of downside risk | +1.68 | ||
| Omega ratioGain probability vs. loss probability | 1.26 | 1.04 | +0.22 |
| Calmar ratioReturn relative to maximum drawdown | 2.01 | 0.14 | +1.87 |
| Martin ratioReturn relative to average drawdown | 8.67 | 0.24 | +8.43 |
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Drawdowns
VOO vs. AON - Drawdown Comparison
The maximum VOO drawdown since its inception was -33.99%, smaller than the maximum AON drawdown of -69.05%. Use the drawdown chart below to compare losses from any high point for VOO and AON.
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Drawdown Indicators
| VOO | AON | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -33.99% | -69.05% | +35.06% |
Max Drawdown (1Y)Largest decline over 1 year | -8.90% | -17.28% | +8.38% |
Max Drawdown (3Y)Largest decline over 3 years | -18.69% | -23.84% | +5.15% |
Max Drawdown (5Y)Largest decline over 5 years | -24.52% | -25.38% | +0.86% |
Max Drawdown (10Y)Largest decline over 10 years | -33.99% | -38.73% | +4.74% |
Current DrawdownCurrent decline from peak | -2.45% | -10.64% | +8.19% |
Average DrawdownAverage peak-to-trough decline | -3.67% | -13.67% | +10.00% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 2.06% | 9.73% | -7.67% |
Volatility
VOO vs. AON - Volatility Comparison
The current volatility for Vanguard S&P 500 ETF (VOO) is 3.22%, while Aon plc (AON) has a volatility of 9.68%. This indicates that VOO experiences smaller price fluctuations and is considered to be less risky than AON based on this measure. The chart below showcases a comparison of their rolling one-month volatility.
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Volatility by Period
| VOO | AON | Difference | |
|---|---|---|---|
Volatility (1M)Calculated over the trailing 1-month period | 3.22% | 9.68% | -6.46% |
Volatility (6M)Calculated over the trailing 6-month period | 9.84% | 21.54% | -11.70% |
Volatility (1Y)Calculated over the trailing 1-year period | 12.62% | 25.41% | -12.79% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 16.90% | 23.36% | -6.46% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 18.00% | 23.58% | -5.58% |
Dividends
VOO vs. AON - Dividend Comparison
VOO's dividend yield for the trailing twelve months is around 1.08%, more than AON's 0.84% yield.
| Position | TTM | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
AON Aon plc | 0.84% | 0.82% | 0.74% | 0.83% | 0.73% | 0.66% | 0.84% | 0.83% | 1.35% | 1.05% | 1.16% | 1.25% |
VOO Vanguard S&P 500 ETF | 1.08% | 1.13% | 1.24% | 1.46% | 1.69% | 1.25% | 1.54% | 1.88% | 2.06% | 1.78% | 2.02% | 2.10% |
Frequently Asked Questions
VOO and AON have a correlation of -0.14, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.
AON has higher volatility (9.68%) compared to VOO (3.22%). In terms of maximum drawdown, VOO dropped -33.99% vs AON's -69.05%.
VOO currently has the higher Sharpe Ratio (1.42 vs 0.09), meaning it's delivered slightly more return per unit of risk over the trailing 12 months. However, this ranking shifts over time - use the Risk/Return Score above for a more comprehensive view that combines Sharpe, Sortino, and other measures used by quantitative funds.
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