Aon (AON) - Market capitalization

Market cap: £55.87 Billion

As of December 2025 Aon has a market cap of £55.87 Billion. This makes Aon the world's 298th most valuable company by market cap according to our data. The market capitalization, commonly called market cap, is the total market value of a publicly traded company's outstanding shares and is commonly used to measure how much a company is worth.

Market cap history of Aon from 1996 to 2025

End of year Market Cap

Year	Marketcap	Change
2025	£55.87 B	-10.03%
2024	£62.10 B	35.8%
2023	£45.73 B	-10.88%
2022	£51.31 B	4.6%
2021	£49.06 B	38.45%
2020	£35.43 B	-3.89%
2019	£36.86 B	34.09%
2018	£27.49 B	10.97%
2017	£24.77 B	4.19%
2016	£23.78 B	41.65%
2015	£16.78 B	-1.56%
2014	£17.05 B	11.52%
2013	£15.29 B	42.97%
2012	£10.69 B	9.89%
2011	£9.73 B	-1.71%
2010	£9.90 B	56.97%
2009	£6.30 B	-24.96%
2008	£8.40 B	15.11%
2007	£7.30 B	35.14%
2006	£5.40 B	-19.28%
2005	£6.69 B	70.07%
2004	£3.93 B	-6.31%
2003	£4.20 B	30.67%
2002	£3.21 B	-51.24%
2001	£6.59 B	9.97%
2000	£5.99 B	-5.53%
1999	£6.34 B	12.09%
1998	£5.66 B	-6.91%
1997	£6.08 B	51.17%
1996	£4.02 B

End of Day market cap according to different sources

On Dec 5th, 2025 the market cap of Aon was reported to be:

£55.68 Billion

by Nasdaq

£55.87 Billion

by CompaniesMarketCap

Market capitalization for similar companies or competitors

Name	Marketcap	Market cap differencediff.	Country
Marsh & McLennan Companies MMC	£67.09 B	20.09%	🇺🇸 USA
AXIS Capital AXS	£5.74 B	-89.72%	🇧🇲 Bermuda
Arch Capital ACGL	£25.69 B	-54.01%	🇧🇲 Bermuda
Prudential PUK	£27.62 B	-50.56%	🇬🇧 UK

What is the market capitalization of a company?

The market capitalization sometimes referred as Marketcap, is the value of a publicly listed company.
In most cases it can be easily calculated by multiplying the share price with the amount of outstanding shares.

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Market capitalization of Aon (AON)

Market cap: £55.87 Billion