Costco (COST) - Market capitalization

Market cap: £331.85 Billion

As of March 2026 Costco has a market cap of £331.85 Billion. This makes Costco the world's 22th 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 Costco from 1996 to 2026

End of year Market Cap

Year	Marketcap	Change
2026	£331.85 B	15.27%
2025	£287.90 B	-13.39%
2024	£332.39 B	44.58%
2023	£229.90 B	37.27%
2022	£167.47 B	-10.2%
2021	£186.49 B	52.31%
2020	£122.44 B	23.66%
2019	£99.01 B	40.07%
2018	£70.69 B	16.9%
2017	£60.47 B	6.1%
2016	£56.99 B	18.92%
2015	£47.92 B	19.5%
2014	£40.10 B	26.41%
2013	£31.72 B	19.23%
2012	£26.61 B	14.13%
2011	£23.31 B	14.18%
2010	£20.41 B	27.11%
2009	£16.06 B	3.51%
2008	£15.51 B	1.66%
2007	£15.26 B	25.05%
2006	£12.20 B	-10.06%
2005	£13.57 B	13.95%
2004	£11.91 B	25.11%
2003	£9.52 B	19.36%
2002	£7.97 B	-42.4%
2001	£13.84 B	15.49%
2000	£11.99 B	-4.43%
1999	£12.54 B	32.44%
1998	£9.47 B	62.74%
1997	£5.82 B	101.72%
1996	£2.88 B

End of Day market cap according to different sources

On Mar 8th, 2026 the market cap of Costco was reported to be:

£331.79 Billion

by Nasdaq

£331.85 Billion

by CompaniesMarketCap

Market capitalization for similar companies or competitors

Name	Marketcap	Market cap differencediff.	Country
Walmart WMT	£739.21 B	122.75%	🇺🇸 USA
Dollar General DG	£24.11 B	-92.73%	🇺🇸 USA
Dollar Tree DLTR	£17.68 B	-94.67%	🇺🇸 USA
Target TGT	£41.10 B	-87.61%	🇺🇸 USA
PriceSmart PSMT	£3.35 B	-98.99%	🇺🇸 USA
Five Below FIVE	£8.89 B	-97.32%	🇺🇸 USA
Big Lots BIG	£11.04 M	-100.00%	🇺🇸 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.

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Market capitalization of Costco (COST)

Market cap: £331.85 Billion