MP Materials Corp. is an American rare-earth materials company headquartered in Las Vegas, Nevada. MP Materials owns and operates the Mountain Pass mine, the only operating rare earth mine and processing facility in the United States. MP Materials focuses its production on neodymium-praseodymium, a rare-earth material used in high-strength permanent magnets that power the traction motors found in electric vehicles, robotics, wind turbines, drones, and other advanced motion technologies. MP Materials is listed on the New York Stock Exchange under the ticker symbol "MP". As of December 2021, JHL Capital Group, QVT Financial and CEO James Litinsky were the company's three largest shareholders, with about 7.7% of the company owned by Shenghe Resources, a Chinese company partly owned by the country's Ministry of Natural Resources. In July 2025, the United States Department of Defense announced a deal that would make it the largest shareholder of MP Materials.