What if you'd held AON?
A $1,000 investment in Aon plc Class A Ordinary Shares (Ireland) (AON) at the month-end close of 1980-06 would be worth $307,257 at the close of 2026-08 — +30625.7% total return, dividends reinvested. The same $1,000 in the S&P 500 would be worth $67,472.
Your scenario
Result
If you'd bought $1,000 at the start of each year
Value of $1,000 invested on January 1 of each year, held to 2026-08, dividends included. Click any year for the full story.
Every year, $1,000 from 1980
| Year | Value of $1,000 | Year return |
|---|---|---|
| 1980 | $1,000 | — |
| 1981 | $1,362 | +36.2% |
| 1982 | $1,567 | +15.1% |
| 1983 | $2,431 | +55.1% |
| 1984 | $2,419 | -0.5% |
| 1985 | $3,284 | +35.8% |
| 1986 | $3,351 | +2.0% |
| 1987 | $2,903 | -13.4% |
| 1988 | $3,735 | +28.6% |
| 1989 | $5,878 | +57.4% |
| 1990 | $5,059 | -13.9% |
| 1991 | $6,027 | +19.1% |
| 1992 | $8,522 | +41.4% |
| 1993 | $7,895 | -7.4% |
| 1994 | $8,147 | +3.2% |
| 1995 | $13,162 | +61.5% |
| 1996 | $16,841 | +28.0% |
| 1997 | $24,346 | +44.6% |
| 1998 | $23,409 | -3.9% |
| 1999 | $25,915 | +10.7% |
| 2000 | $22,809 | -12.0% |
| 2001 | $24,254 | +6.3% |
| 2002 | $13,307 | -45.1% |
| 2003 | $17,346 | +30.4% |
| 2004 | $17,718 | +2.1% |
| 2005 | $27,346 | +54.3% |
| 2006 | $27,329 | -0.1% |
| 2007 | $37,440 | +37.0% |
| 2008 | $36,365 | -2.9% |
| 2009 | $30,985 | -14.8% |
| 2010 | $37,662 | +21.6% |
| 2011 | $38,774 | +3.0% |
| 2012 | $46,644 | +20.3% |
| 2013 | $71,110 | +52.5% |
| 2014 | $81,281 | +14.3% |
| 2015 | $80,167 | -1.4% |
| 2016 | $98,203 | +22.5% |
| 2017 | $119,303 | +21.5% |
| 2018 | $131,167 | +9.9% |
| 2019 | $189,767 | +44.7% |
| 2020 | $194,256 | +2.4% |
| 2021 | $278,544 | +43.4% |
| 2022 | $280,250 | +0.6% |
| 2023 | $273,789 | -2.3% |
| 2024 | $340,732 | +24.5% |
| 2025 | $336,030 | -1.4% |
| 2026 | $333,426 | -0.8% |
Best and worst month-end to buy
The best single month-end close to have bought AON was 1981-02 ($1.04): $1,000 then is $335,674 today. The worst was 2025-02 ($406): $1,000 then is $857.
FAQ
What would $1,000 in AON be worth today?
A $1,000 investment in Aon plc Class A Ordinary Shares (Ireland) (AON) at the start of 1980 would be worth about $307,257 today, a total return of +30625.7%. Dividends are reinvested in these figures.
What were the best and worst years for AON?
Aon plc Class A Ordinary Shares (Ireland) (AON)'s strongest calendar year since 1980 was 1995, a +61.5% return — $1,000 held through that year became about $1,615 by year-end. Its weakest year was 2002, at -45.1%.
Does the calculator include dividends and splits?
Yes where available. Prices are adjusted for both stock splits and reinvested dividends (total return), the same measure brokerages use.
How much would $100 per month in AON have grown?
Investing $100 at the end of every month since 1980-06 would have grown to about $2.52M on $55,500 invested.
Did AON beat the S&P 500?
Over the same period, $1,000 in the S&P 500 index would be worth $67,472. AON beat the S&P 500 by +355.4% in total return.
Is this investment advice?
No. What If I'd Held is an entertainment and education tool. Every number is a historical calculation, not a prediction, and past performance never guarantees future results.
Methodology
Aon plc Class A Ordinary Shares (Ireland) (AON) historical total-return data from 1980-06 to 2026-08, reduced to month-end closes for the tables above.
Returns use adjusted close prices from Yahoo Finance historical data — adjusted for stock splits and reinvested dividends — the same convention used by major brokerages. A "year" scenario invests $1,000 at the prior December's month-end close and values it at the latest available month-end close.
Month-end resolution means intra-month extremes are not captured in tables; the calculator uses exact trading-day closes where daily data is available. Figures ignore taxes, fees, and the currency effects of non-USD listings. History is not a forecast. What If I'd Held is entertainment, not investment advice.
What if you'd held…
Data: adjusted close prices via Yahoo Finance. As of 2026-08. Not financial advice.