The sale of the Ultimate Fighting Championship now is official. William Morris Endeavor, along with International Management Group today announced its acquisition of the world’s leading MMA promotion through a news release. Terms of the deal were not disclosed, though the Las Vegas CBS affilitate reported late Sunday the sale price was $4 billion. Along with WME and IMG, Silver Lake Partners and KKR are along as investors, as are MSD Capital/MSD Partners. WME-IMG is one of the world’s leading talent agencies, and its clients include former UFC women’s bantamweight champion and crossover star Ronda Rousey. The company’s CEOs are Ari Emanuel and Patrick Whitesell.