Roger Federer has lost his billionaire status following a sharp decline in the stock value of the Swiss athletic brand On, in which he holds a significant stake. According to Forbes, Federer's net worth has fallen to $952 million (£704 million), down from $1.1 billion (£813 million) last year.

Federer's wealth was largely attributed to his estimated three percent minority stake in On, a company he has been associated with since 2019. On, which went public on the New York Stock Exchange in 2021, had a market capitalization of nearly $15 billion (£11.1 billion) as of August 2025, with Federer's equity valued at over $375 million (£277.3 million).

However, on Tuesday, On's company share price dropped by more than 20 percent, a decrease attributed to sales that did not meet market expectations, despite being record sales. The company also lowered its revenue forecast. This market performance resulted in a loss of $52 million (£38.4 million) for Federer.

The decline in Federer's net worth means that only eight athletes now remain on the list of the world's billionaires. Among them are basketball icons Michael Jordan ($4.3 billion), Magic Johnson ($1.6 billion), and LeBron James ($1.4 billion). Golf legend Tiger Woods is valued at $1.5 billion, while football stars Cristiano Ronaldo ($1.2 billion), Lionel Messi ($1.1 billion), and David Beckham ($1 billion) also maintain billionaire status.

Former tennis player Ion Tiriac, who became sport's first billionaire in 2007 through investments in real estate, car dealerships, and financial services, is currently worth $2.3 billion. Athletes currently active in their sports who have achieved billionaire status include James, Woods, Ronaldo, and Messi.

During his illustrious 24-year professional tennis career, Federer won 103 tournaments, earning nearly $131 million (£97 million) in prize money. His off-court earnings, primarily from sponsorship deals, amounted to approximately $1 billion (£739 million) pre-tax. Notable endorsements included a 24-year partnership with Nike worth $150 million (£110 million) and a subsequent 10-year deal with Uniqlo valued at $300 million (£228 million).

Federer's other long-standing sponsorships include agreements with brands such as Lindt, Mercedes-Benz, Rolex, and Moet & Chandon. His off-court income enabled him to be the highest-paid tennis player for 16 consecutive years and the highest-earning sportsperson globally in 2020.