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Dustin Poirier primarily fights for the Ultimate Fighting Championship (UFC). The UFC is a mixed martial arts (MMA) organization that was founded in 1993. It is the largest MMA organization in the world, and it is headquartered in Las Vegas, Nevada. Poirier has been fighting for the UFC since 2011, and he has won the UFC Lightweight Championship twice. He is currently ranked number two in the UFC lightweight division.