UFC, the premier mixed martial arts promoter, has been sold for about $4 billion to a group led by Hollywood talent agency WME-IMG and backed by private-equity firms Silver Lake Partners LP, KKR & Co. and the investment firm of Michael Dell.

"UFC has experienced tremendous growth over the last decade and we are looking forward to helping the organization and its athletes identify new opportunities to develop and further establish their global footprint," WME co-Chief Executive Officer Ari Emanuel said in the memo. The deal was first reported by The New York Times.

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