What is the largest rare earth company in the USA?

Written by Editorial Team | Last Updated: August 2026

MP Materials Corp. operates as the largest rare earth mining and processing company in the United States. Owning and operating the historic Mountain Pass mine in California, MP Materials extracts and processes rare earth concentrates, supplying a substantial percentage of the global demand for neodymium-praseodymium. The company plays a critical role in securing the domestic supply chain for critical minerals, advanced electronics, clean energy infrastructure, and national defense applications.

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