Privately held companies based in the Las Vegas Valley

American space technology company

TKO Operating Company, LLC (TKO OpCo), also doing business as Zuffa ( ), is an American sports promotion company specializing in mixed martial arts. It was founded in January 2001 in Las Vegas, Nevada, by Station Casinos executives Frank Fertitta III and Lorenzo Fertitta to be the parent entity of the Ultimate Fighting Championship (UFC) after they purchased it from the Semaphore Entertainment Group.