BetMGM
BetMGM is a subsidiary of MGM Resorts International, the hospitality and entertainment giant. BetMGM has official partnerships with the NBA, NHL and MLB, as well as exclusive betting partnerships with numerous NFL teams.
DraftKings
DraftKings started life as a daily fantasy sports (DFS) operator, launching DraftKings Sportsbook in New Jersey on August 1, 2018 - making it the first company to offer legal, online, mobile sports betting services. DraftKings also offers retail sports betting in partnership with casinos throughout the US.