MP Materials shares remain in focus after soaring 20% yesterday on news that Apple plans to invest $500 million in the rare earths firm, news that came just days after the Department of Defense took a stake in the company.

However, it’s not just the government rushing to ensure rare earth supply. Apple (NASDAQ: AAPL) has one-upped the Pentagon by announcing a $500 million agreement with MP Materials to secure recycled rare earth magnets.

The long-term bull case for the stock rests on the idea that U.S. administrations will aim for rare earth material independence from China, and MP Materials, a company that operates the only rare earth and processing facility, at Mountain Pass in California, , will be a key part of the process.