Arthur J. Gallagher & Co. (AJG) - Market capitalization

Market cap: £45.84 Billion

As of September 2026 Arthur J. Gallagher & Co. has a market cap of £45.84 Billion. This makes Arthur J. Gallagher & Co. the world's 406th 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 Arthur J. Gallagher & Co. from 1996 to 2026

End of year Market Cap

Year	Marketcap	Change
2026	£45.84 B	-8.05%
2025	£49.86 B	-12.58%
2024	£57.03 B	49.66%
2023	£38.11 B	15.99%
2022	£32.85 B	25.4%
2021	£26.20 B	50.11%
2020	£17.45 B	27.78%
2019	£13.66 B	27.87%
2018	£10.68 B	26.2%
2017	£8.46 B	12.87%
2016	£7.50 B	53.47%
2015	£4.88 B	-1.81%
2014	£4.97 B	30.95%
2013	£3.80 B	41.17%
2012	£2.69 B	10.87%
2011	£2.42 B	18.93%
2010	£2.04 B	43.22%
2009	£1.42 B	-16.36%
2008	£1.70 B	52.09%
2007	£1.12 B	-24.46%
2006	£1.48 B	-13.44%
2005	£1.71 B	9.91%
2004	£1.55 B	-4.59%
2003	£1.63 B	0.75%
2002	£1.62 B	-19.86%
2001	£2.02 B	19.48%
2000	£1.69 B	129.56%
1999	£0.73 B	57.64%
1998	£0.46 B	34.62%
1997	£0.34 B	17.92%
1996	£0.29 B

End of Day market cap according to different sources

On Sep 20th, 2026 the market cap of Arthur J. Gallagher & Co. was reported to be:

£45.84 Billion

by Nasdaq

£45.84 Billion

by CompaniesMarketCap

Market capitalization for similar companies or competitors

Name	Marketcap	Market cap differencediff.	Country
Aon AON	£46.83 B	2.16%	🇬🇧 UK
Marsh & McLennan Companies MRSH	£62.37 B	36.05%	🇺🇸 USA
Brown & Brown BRO	£16.24 B	-64.56%	🇺🇸 USA

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.

DISCLAIMER

CompaniesMarketCap is not associated in any way with CoinMarketCap.com
Stock prices are delayed, the delay can range from a few minutes to several hours.
Company logos are from the CompaniesLogo.com logo database and belong to their respective copyright holders. Companies Marketcap displays them for editorial purposes only.

Contact

For inquiries or if you want to report a problem write to hello@8marketcap.com

Links

- Privacy policy

- Terms and conditions

Market capitalization of Arthur J. Gallagher & Co. (AJG)

Market cap: £45.84 Billion