Costco is a US multinational retail corporation that acts as one of the largest retailers in the world, operating on a membership-only basis. Founded in 1976, it has headquarters in Washington. The company has more than 800 warehouses worldwide, as well as 20 office locations across 11 countries. Costco retails electronics, groceries, clothing and cleaning supplies, and operates exclusive services such as optical and hearing centres and fuel stations. The company has over 100 million members and it also has an online shopping site for customers that prefer an e-commerce approach. Costco stock is listed on the Nasdaq exchange and is a constituent of the Nasdaq-100 and S&P 500 stock indices. Spread bet or trade CFDs on our Costco share price.