LOS ANGELES (AP) — Oscar de la Hoya’s boxing promotion company is suing Floyd Mayweather’s manager and investors for $300 million, alleging they’re trying to illegally monopolize U.S. championship fighting.

Golden Boy Promotions filed the federal antitrust and unfair competition suit Wednesday in Los Angeles.

READ MORE: ‘He Sang The National Anthem At Our Graduations,' Sheriff Washington Remembers Wayne County Corporal Who Died From COVID-19

It names Al Haymon, his companies, and the venture capital firm Waddell & Reed Financial.

The suit alleges that Haymon, who represents more than 150 fighters, violates the federal Muhammad Ali Boxing Reform Act and also California and Nevada state laws by acting as both manager and promoter.

READ MORE: Whitmer Releases Plan Draft For Achieving Carbon Neutrality In Michigan

While Haymon doesn’t call himself a promoter, the suit claims he’s forbidden his boxers to sign with other promoters and both arranged and paid for sponsors, arenas, and TV air time for championship matches — and even paid the purses.

Messages left at Waddell & Reed and Haymon’s Premier Boxing Champions weren’t immediately returned.

MORE NEWS: Former Oakland County Priest Pleads Guilty In Sex Abuse Cases, Sentenced Up To 15 Years

(Copyright 2015 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.)