Following the purchase of WEC , Zuffa made several changes to the promotion .
On December 11 , 2006 UFC parent - company , Zuffa formalized plans to buy World Extreme Cagefighting , to be run as a separate promotion from the UFC .
Following the purchase of World Extreme Cagefighting , Zuffa made several changes to the promotion .
On December 11 , 2006 UFC parent - company , Zuffa formalized plans to buy World Extreme Cagefighting , to be run as a separate promotion from the UFC .