David Beckham is looking to recoup millions of dollars from a fitness brand co-owned by Mark Wahlberg . He claims F45 failed to pay him shares of stock owed to him for promoting the company.

Beckhams company, DB Ventures, filed suit against the fitness center franchise last April. This week, new court documents filed with the U.S. District Court of Central California made the case public.

In court filings obtained by HuffPost, representatives for Beckham accuse F45 of not meeting their end of a 2020 deal with the soccer star to promote the brand ahead of its initial public offering.

In exchange for promoting F45, Beckham was paid $1.5 million a year and promised substantial amounts of shares in stock, which would be available after the company went public.

In the legal complaint, Beckhams team alleges F45 delayed key stock transactions for months, causing the athlete to lose millions when the share price dropped.