As of December 2021, which is the largest sporting goods retailer in the world?

Decathlon S.A. is a French sporting goods retailer. With over 1,647 stores in nearly 300 cities in 57 countries and regions (Jan 2020), it is the largest sporting goods retailer in the world. As of May 2021, Decathlon operated 1,655 Decathlon stores worldwide in nearly 1,000 cities and 65 countries. Founded by Michel Leclercq in 1976, Decathlon started with a store in Lille, France.

The company manages the research, design, production, logistics and distribution of its products in house; partners with global suppliers; and markets their own brands directly to consumers in Decathlon-branded big-box stores. The retailer stocks a wide range of sporting goods, from tennis rackets to advanced scuba diving equipment, usually in large, big-box superstores averaging 4,000m2 in size.

Decathlon is vertically integrated, designing and developing its own products and marketing under its more than 20 brands, with each sport—and often sub-sports and sports groups—having its own brand.

Nike, Inc., which is an American multinational corporation, is the world's largest supplier and manufacturer of athletic shoes, apparel, and other sports equipment.

Dick's Sporting Goods has been around since 1948 and is considered the largest retailer of sporting goods and equipment in the US.