Nike claims that StockX is failing to authenticate the shoes listed on the site and selling counterfeits. Jeff Kowalsky/AFP via Getty Images hide caption toggle caption Jeff Kowalsky/AFP via Getty Images Business What is StockX and why is Nike suing them? May 12, 2022 StockX is an online marketplace where many sneakerheads buy and sell shoes. But Nike is claiming in a lawsuit that StockX is not authenticating all products and selling counterfeits.