Todd Spangler NY Digital Editor Investors cheered as TKO Group Holdings, the new parent company of UFC and WWE, clambered into the Wall Street ring. Shares of TKO, which began trading Tuesday on the New York Stock Exchange, closed up 2.6% on the day, to $103.22 per share after opening at $102. TKO Group has a market capitalization of $8.57 billion, per data from CNBC.