Nike Escalates StockX Feud, Says Site Is Selling Fake Shoes (1)

Nike Inc. escalated its legal battle with sneaker marketplace StockX, saying it purchased four pairs of counterfeit shoes on the platform despite the company’s promises that it is only marketing authentic footwear.

The world’s largest athletic-wear maker asked a federal judge to let it add claims of counterfeiting and false advertising to the current trademark-infringement lawsuit against StockX. It said it obtained the fake shoes, including a counterfeit Air Jordan 1 Retro High OG, from the marketplace between December and January.

“Those four pairs of counterfeit shoes were all purchased within a short two-month period on StockX’s platform, all had ...