MGM Resorts International is an American global hospitality and entertainment company operating destination resorts in Las Vegas , Massachusetts , Detroit , Mississippi , Maryland , and New Jersey , including Bellagio , Mandalay Bay , MGM Grand , and Park MGM . In January 2019 the company took over Empire City Casino in Yonkers, New York , and also opened MGM National Harbor in Maryland and MGM Springfield in Massachusetts . The company has a majority interest in MGM China Holdings Limited, which owns the MGM Macau resort and casino, and is developing a gaming resort in Cotai . MGM Resorts owns 50 percent of CityCenter in Las Vegas, which features Aria Resort & Casino . It has a majority controlling interest in MGM Growth Properties , a real estate investment trust.