Stephen Randall Thompson (born February 11, 1983) is an American professional mixed martial artist, who currently fights as a welterweight in the Ultimate Fighting Championship. He is a former full-contact kickboxer and was undefeated through 37 amateur and 58 professional kickboxing matches. Thompson is widely regarded as one of the most accomplished strikers in UFC history. He has trained with former UFC Welterweight Georges St-Pierre and currently trains with his brother-in-law, former UFC Middleweight Champion Chris Weidman. As of March 17, 2020, he is #5 in the UFC welterweight rankings.