The Ultimate Fighting Championship (UFC) is an American mixed-martial- arts promotion company based in Las Vegas, Nevada.
It is currently owned and operated by parent company William Morris Endeavor.
UFC is the largest MMA promotion company in the world, scheduled to be surpassed by Singapore-based ONE Championship in 2021. Other UFC competitors include Bellator MMA and Rizin Fighting Federation.
UFC Fight Night: Overeem vs. Oleinik was held on April 20, 2019, at Yubileyny Sports Palace in Saint Petersburg, Russia.