AON vs SPY: Aon plc vs SPDR S&P 500 ETF Trust Historical Returns & Investment Comparison
This AON vs SPY comparison analyzes the historical stock performance of Aon plc and SPDR S&P 500 ETF Trust side-by-side. Using real, adjusted market data, this tool shows how identical investments in both stocks would have performed over time—highlighting differences in returns, volatility, and consistency across market cycles.
Use the interactive calculator below to adjust the investment amount and time period, visualizing how Aon plc and SPDR S&P 500 ETF Trust have historically performed against each other.
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Performance Summary
$10,000 invested from 1986 to 2025 (40 years)
Head-to-Head Record
Over the 33-year comparison period, Aon plc outperformed SPDR S&P 500 ETF Trust in 21 years, while SPDR S&P 500 ETF Trust outperformed Aon plc in 12 years.
AON - Aon plc
SPY - SPDR S&P 500 ETF Trust
Overall Winner: AON with an average annual return of 15.02% (vs 11.71% for SPY)
Understanding AON vs SPY Performance
When comparing Aon plc and SPDR S&P 500 ETF Trust, investors should consider multiple factors beyond just total returns. Volatility, consistency of growth, dividend payments, and sector-specific risks all play crucial roles in determining which stock might be better suited for your investment strategy and risk tolerance.
Historical performance data shows how each stock responded to market downturns, economic expansions, and company-specific events. While past performance doesn't guarantee future results, understanding these patterns can help inform investment decisions and portfolio allocation strategies.
Cumulative Growth Comparison
A $10,000 investment in Aon plc grew to $1,129,296, compared to $250,597 for SPDR S&P 500 ETF Trust over the same period.
Year-by-Year Comparison
| Year | AON Return | AON Cumulative | SPY Return | SPY Cumulative | Difference | Winner |
|---|---|---|---|---|---|---|
| 1986 (Start) | - | $10,000.00 | - | $10,000.00 | - | Initial Investment |
| 1987 | +2.92% | $10,292.32 | - | - | - | Tie |
| 1988 | -17.47% | $8,493.78 | - | - | - | Tie |
| 1989 | +24.57% | $10,580.99 | - | - | - | Tie |
| 1990 | +59.53% | $16,880.37 | - | - | - | Tie |
| 1991 | -14.39% | $14,451.82 | - | - | - | Tie |
| 1992 | +19.54% | $17,275.90 | - | - | - | Tie |
| 1993 | +41.40% | $24,427.45 | - | - | - | Tie |
| 1994 | -6.48% | $22,844.52 | +8.71% | $10,870.91 | -15.19% (SPY) | SPY |
| 1995 | +3.73% | $23,695.78 | +0.67% | $10,943.47 | +3.06% (AON) | AON |
| 1996 | +61.56% | $38,281.88 | +37.39% | $15,035.16 | +24.17% (AON) | AON |
| 1997 | +26.37% | $48,377.91 | +21.20% | $18,223.19 | +5.17% (AON) | AON |
| 1998 | +45.74% | $70,504.22 | +33.14% | $24,261.81 | +12.60% (AON) | AON |
| 1999 | -3.03% | $68,371.15 | +28.03% | $31,063.11 | -31.06% (SPY) | SPY |
| 2000 | +9.84% | $75,097.13 | +20.66% | $37,482.18 | -10.83% (SPY) | SPY |
| 2001 | -9.73% | $67,790.36 | -8.85% | $34,165.23 | -0.88% (SPY) | SPY |
| 2002 | +8.51% | $73,560.67 | -10.13% | $30,703.75 | +18.64% (AON) | AON |
| 2003 | -45.10% | $40,383.77 | -22.42% | $23,820.14 | -22.68% (SPY) | SPY |
| 2004 | +25.83% | $50,813.75 | +24.18% | $29,580.86 | +1.64% (AON) | AON |
| 2005 | +1.63% | $51,640.71 | +10.75% | $32,760.13 | -9.12% (SPY) | SPY |
| 2006 | +56.18% | $80,652.58 | +5.32% | $34,504.59 | +50.86% (AON) | AON |
| 2007 | -3.55% | $77,789.93 | +13.84% | $39,281.03 | -17.39% (SPY) | SPY |
| 2008 | +36.80% | $106,417.14 | +5.33% | $41,375.53 | +31.47% (AON) | AON |
| 2009 | -0.26% | $106,143.47 | -36.24% | $26,382.38 | +35.98% (AON) | AON |
| 2010 | -13.74% | $91,561.63 | +22.65% | $32,359.23 | -36.39% (SPY) | SPY |
| 2011 | +23.11% | $112,723.25 | +13.14% | $36,610.39 | +9.97% (AON) | AON |
| 2012 | +4.06% | $117,301.49 | +0.85% | $36,922.44 | +3.21% (AON) | AON |
| 2013 | +19.71% | $140,420.06 | +14.17% | $42,154.69 | +5.54% (AON) | AON |
| 2014 | +47.62% | $207,291.58 | +29.00% | $54,380.19 | +18.62% (AON) | AON |
| 2015 | +16.43% | $241,341.85 | +14.56% | $62,298.86 | +1.86% (AON) | AON |
| 2016 | -1.07% | $238,749.49 | +1.29% | $63,101.60 | -2.36% (SPY) | SPY |
| 2017 | +24.52% | $297,301.60 | +13.59% | $71,674.43 | +10.94% (AON) | AON |
| 2018 | +20.89% | $359,407.34 | +20.78% | $86,569.38 | +0.11% (AON) | AON |
| 2019 | +12.04% | $402,691.07 | -5.25% | $82,026.91 | +17.29% (AON) | AON |
| 2020 | +46.00% | $587,932.95 | +31.09% | $107,527.02 | +14.91% (AON) | AON |
| 2021 | +2.12% | $600,400.92 | +17.24% | $126,059.55 | -15.11% (SPY) | SPY |
| 2022 | +48.10% | $889,198.65 | +30.51% | $164,514.60 | +17.60% (AON) | AON |
| 2023 | +3.12% | $916,977.84 | -18.65% | $133,838.54 | +21.77% (AON) | AON |
| 2024 | -2.07% | $897,991.62 | +26.71% | $169,585.78 | -28.78% (SPY) | SPY |
| 2025 | +25.75% | $1,129,197.35 | +25.59% | $212,981.61 | +0.16% (AON) | AON |
| 2026 | +0.01% | $1,129,295.68 | +17.66% | $250,597.02 | -17.65% (SPY) | SPY |
Annual returns include dividends and stock splits. Cumulative values show growth of $10,000 invested from the first year. Positive difference means AON outperformed SPY that year.
Company Profiles
Aon plc
AON
Aon plc is a professional services firm providing a broad range of risk, retirement and health solutions. They empower organizations and individuals to secure a better future through innovative and effective solutions.
Key Innovations
- ✓A global leader in risk management and insurance brokerage.
- ✓A focus on data and analytics to provide insights that help clients make better decisions.
Business Segments
- Commercial Risk SolutionsProvides retail and specialty brokerage, global risk consulting and captives management.
- Reinsurance SolutionsProvides treaty and facultative reinsurance brokerage and capital management services.
- Retirement SolutionsProvides a range of retirement, investment and human capital solutions.
SPDR S&P 500 ETF Trust
SPY
SPY is the first exchange-traded fund (ETF) listed in the US. It is designed to track the S&P 500 Index, which measures the performance of the large-cap segment of the US equity market.
Key Innovations
- ✓First US-listed ETF
Business Segments
- ETFPassive investment vehicle tracking the S&P 500.
How This Comparison Works
Our stock comparison tool uses adjusted closing prices to calculate year-by-year returns for both stocks. This ensures an apples-to-apples comparison that accounts for:
- ✓Dividends: All dividend payments are reinvested
- ✓Stock splits: Historical prices are adjusted for all splits
- ✓Head-to-head record: Shows which stock outperformed each year
- ✓Statistical analysis: Average returns, best/worst years, and win rates
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Important Disclaimer
This comparison tool is for educational and informational purposes only and does not constitute financial, investment, or trading advice. Past performance is not indicative of future results. Historical returns include dividends and stock splits but do not account for taxes, fees, inflation, or individual circumstances. Stock market investments carry risk, including the potential loss of principal. Always consult with a qualified financial advisor before making investment decisions. The data presented is based on historical market data and may contain inaccuracies or delays.