Market capitalization of Costco (COST)

Market cap: A$595.23 Billion

As of August 2026 Costco has a market cap of A$595.23 Billion. This makes Costco the world's 32th 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	A$595.23 B	2.83%
2025	A$578.87 B	-13.68%
2024	A$670.63 B	55.99%
2023	A$429.90 B	44.39%
2022	A$297.74 B	-14.25%
2021	A$347.23 B	59.98%
2020	A$217.05 B	17.04%
2019	A$185.45 B	45.59%
2018	A$127.37 B	21.68%
2017	A$104.68 B	7.3%
2016	A$97.56 B	0.07%
2015	A$97.49 B	27.78%
2014	A$76.29 B	30.04%
2013	A$58.67 B	41.76%
2012	A$41.38 B	17.11%
2011	A$35.34 B	13.89%
2010	A$31.03 B	7.24%
2009	A$28.93 B	-10.24%
2008	A$32.23 B	-7.06%
2007	A$34.68 B	14.35%
2006	A$30.33 B	-5.17%
2005	A$31.99 B	8.25%
2004	A$29.55 B	28.97%
2003	A$22.91 B	0.93%
2002	A$22.70 B	-42.3%
2001	A$39.34 B	22.91%
2000	A$32.00 B	3.75%
1999	A$30.85 B	19.92%
1998	A$25.72 B	75.28%
1997	A$14.67 B	135.97%
1996	A$6.22 B

End of Day market cap according to different sources

On Aug 6th, 2026 the market cap of Costco was reported to be:

A$597.67 Billion

by Nasdaq

A$597.67 Billion

by CompaniesMarketCap

Market capitalization for similar companies or competitors

Name	Marketcap	Market cap differencediff.	Country
Walmart WMT	A$1.262 T	112.14%	🇺🇸 USA
Dollar General DG	A$39.85 B	-93.30%	🇺🇸 USA
Dollar Tree DLTR	A$35.42 B	-94.05%	🇺🇸 USA
Target TGT	A$94.57 B	-84.11%	🇺🇸 USA
PriceSmart PSMT	A$7.62 B	-98.72%	🇺🇸 USA
Five Below FIVE	A$18.38 B	-96.91%	🇺🇸 USA
Big Lots BIG	A$20.93 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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