LeBron James teases partnership with Polymarket

Sports legend LeBron James speaking at the CNBC Game Plan Summit in New York City on July 16, 2026.Shea Kastriner | CNBCSuperstar athlete LeBron James teased an upcoming partnership with prediction market platform Polymarket in a social media post on Saturday.James posted a 14-second video on social media platform X that appeared to be an advertisement for Polymarket. "Welcome to Polymarket HQ. Coming soon. In partnership with @Polymarket," James wrote. In the video, the basketball legend appears in the elevator of Polymarket's headquarters and heads to the company's sports floor. The post teases a larger campaign between James and Polymarket focused on football, according to a person familiar with the matter, who spoke to CNBC on condition of anonymity because they weren't authorized to speak publicly. Further details are expected in the week ahead, the person added. The terms of James' deal with Polymarket have not been disclosed. NBA rules restrict players' financial interests in companies that offer league-related wagering or similar products, including limits on ownership stakes.Representatives for James and Polymarket declined to comment beyond James' Saturday post. James, wh...