Aon plc (AON)
 NYSE: AON · Real-Time Price · USD
 328.19
 +2.12 (0.65%)
  At close: Oct 30, 2025, 4:00 PM EDT
330.30
 +2.11 (0.64%)
  After-hours: Oct 30, 2025, 7:52 PM EDT
Aon plc Market Cap
Aon plc has a market cap or net worth of $70.77 billion as of October 30, 2025. Its market cap has decreased by -9.16% in one year.
Market Cap 
 70.77B
Enterprise Value 
 87.72B
1-Year Change 
 -9.16%
Ranking 
 Category 
 Stock Price 
$328.19
Market Cap Chart
Since December 1, 1998, Aon plc's market cap has increased from $9.85B to $70.77B, an increase of 618.12%. That is a compound annual growth rate of 7.60%.
Market Cap History
| Date | Market Cap | % Change | 
|---|---|---|
| Oct 29, 2025 | 70.31B | -9.48% | 
| Dec 31, 2024 | 77.67B | 33.31% | 
| Dec 29, 2023 | 58.27B | -6.15% | 
| Dec 30, 2022 | 62.08B | -6.25% | 
| Dec 31, 2021 | 66.22B | 37.11% | 
| Dec 31, 2020 | 48.30B | -0.96% | 
| Dec 31, 2019 | 48.77B | 39.30% | 
| Dec 31, 2018 | 35.01B | 4.55% | 
| Dec 29, 2017 | 33.49B | 14.12% | 
| Dec 30, 2016 | 29.34B | 16.56% | 
| Dec 31, 2015 | 25.17B | -6.90% | 
| Dec 31, 2014 | 27.04B | 7.07% | 
| Dec 31, 2013 | 25.25B | 42.51% | 
| Dec 31, 2012 | 17.72B | 17.13% | 
| Dec 30, 2011 | 15.13B | 21.40% | 
| Dec 31, 2010 | 12.46B | 18.67% | 
| Dec 31, 2009 | 10.50B | -14.78% | 
| Dec 31, 2008 | 12.32B | -11.43% | 
| Dec 31, 2007 | 13.91B | 27.14% | 
| Dec 29, 2006 | 10.94B | -4.87% | 
| Dec 30, 2005 | 11.50B | 52.37% | 
| Dec 31, 2004 | 7.55B | 0.57% | 
| Dec 31, 2003 | 7.51B | 45.60% | 
| Dec 31, 2002 | 5.16B | -46.08% | 
| Dec 31, 2001 | 9.56B | 9.02% | 
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Market Capitalization
Market capitalization, also called net worth, is the total value of all of a company's outstanding shares. It is calculated by multiplying the stock price by the number of shares outstanding.
Formula: Market Cap = Stock Price * Shares Outstanding
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