Billionaire Mike Repole is taking horse racing's establishment to court. Repole has notified the defendants to be named in a national lawsuit — including the National Thoroughbred Racing Association, the Thoroughbred Owners and Breeders Association, The Jockey Club, and the Breeders' Cup — that he intends to sue them as part of a campaign to force sweeping reform in the sport. In response, the organizations told Repole to be prepared for a stringent defense and possible countersuit.

Repole's stated goal is not about tearing the sport down but about saving the tracks, the people, the small owners and breeders, the fans, and most importantly, protecting the Thoroughbred. The 56-year-old is among horse racing's wealthiest and most passionate participants. A fan of the sport since his teens, Repole founded Repole Stable soon after selling Glaceau, the maker of Vitaminwater, to Coca-Cola in 2007 for $4.1 billion.

His most famous horse to date, Uncle Mo, sired Nyquist, the 2016 Kentucky Derby winner. Repole Stable's Vino Rosso won the 2019 Breeders' Cup and the Gold Cup at Santa Anita. Repole has invested tens of millions of dollars in the sport and has long been one of its most visible owners.

Repole says that while the roughly 200 horses that die at tracks annually garner the headlines, there are thousands more each year who are not properly cared for after their racing days are over. He has asked pointedly what happens to the thousands of thoroughbreds that do not find aftercare homes, noting that many are shipped to Mexico for slaughter — a fate he calls an industry disgrace.

The lawsuit is expected to demand structural reforms, including mandatory funding for aftercare programs and greater transparency about what happens to horses when their racing careers end. Repole, who says he has the financial resources to take the fight to the end, has hired prominent attorneys and framed the case as a national reckoning for the sport.

The governing bodies have pushed back, warning of a stringent defense. Industry leaders argue that significant progress has been made on safety and aftercare in recent years, pointing to declining fatality rates and expanded retirement programs. But Repole's challenge, backed by virtually unlimited resources and national media attention, may be the most serious legal threat the sport's establishment has ever faced. No trial date has been set, and the governing bodies have given no indication they intend to negotiate. Repole, meanwhile, has signaled he is prepared for a long fight, one he says the horses cannot afford to lose.