Buffalo Bills and Sabres owner Terry Pegula checked in at No. 424 on Forbes' annual list of the world's billionaires.
The publication listed Pegula with a worth of $4.5 billion, noting how he made his fortune in fracking and then built a sports empire. He purchased the Sabres for $189 million in 2011 and bought the Bills for $1.4 billion in 2014.
Stan Kroenke, who owns the Los Angeles Rams, is listed as the richest NFL owner in the United States at $8.7 billion, followed by Cowboys owner Jerry Jones ($6.8 billion), Patriots owner Robert Kraft ($6.5 billion) and Falcons owner Arthur Blank ($4.7 billion). Kroenke also owns the NHL's Colorado Avalanche.
Los Angeles Clippers owner Stephen Ballmer, of Microsoft fame, is the richest pro sports owner in the U.S. at $41.2 billion. Mukesh Ambani, who owns the Mumbia Indians cricket team, is the richest pro sports owner in the world with a worth of $50 billion.