Costco (COST) - Market capitalization

Market cap: $422.83 Billion USD

As of May 2026 Costco has a market cap of $422.83 Billion USD. This makes Costco the world's 28th 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	$422.83 B	9.05%
2025	$387.73 B	-7.05%
2024	$417.13 B	42.42%
2023	$292.89 B	44.56%
2022	$202.61 B	-19.51%
2021	$251.73 B	50.83%
2020	$166.89 B	28.54%
2019	$129.84 B	44.7%
2018	$89.73 B	9.8%
2017	$81.72 B	16.21%
2016	$70.32 B	-0.98%
2015	$71.02 B	13.74%
2014	$62.44 B	19.31%
2013	$52.33 B	21.68%
2012	$43.01 B	18.69%
2011	$36.23 B	14.96%
2010	$31.52 B	21.26%
2009	$25.99 B	14.29%
2008	$22.74 B	-25%
2007	$30.32 B	26.82%
2006	$23.91 B	2.16%
2005	$23.40 B	2.36%
2004	$22.86 B	34.27%
2003	$17.03 B	33.16%
2002	$12.78 B	-36.3%
2001	$20.07 B	12.19%
2000	$17.89 B	-11.73%
1999	$20.27 B	28.7%
1998	$15.75 B	64.74%
1997	$9.56 B	93.52%
1996	$4.94 B

End of Day market cap according to different sources

On May 28th, 2026 the market cap of Costco was reported to be:

$441.52 Billion USD

by Nasdaq

$441.52 Billion USD

by CompaniesMarketCap

Market capitalization for similar companies or competitors

Name	Marketcap	Market cap differencediff.	Country
Walmart WMT	$923.51 B	118.41%	🇺🇸 USA
Dollar General DG	$24.19 B	-94.28%	🇺🇸 USA
Dollar Tree DLTR	$22.39 B	-94.70%	🇺🇸 USA
Target TGT	$57.71 B	-86.35%	🇺🇸 USA
PriceSmart PSMT	$5.25 B	-98.76%	🇺🇸 USA
Five Below FIVE	$12.53 B	-97.04%	🇺🇸 USA
Big Lots BIG	$14.74 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: $422.83 Billion USD