For years, the “domestic rare earth supply chain” has been more of a policy talking point than a viable business. That’s starting to change. MP Materials Corp. (NYSE:MP), the company at the center of America’s push to reduce reliance on Chinese-processed rare earths, told investors at the Jefferies Global Industrials Conference on September 9 that it is nearing full run-rate production of neodymium-praseodymium oxide and expects to deliver commercial magnets to General Motors Company (NYSE:GM) by the end of the year.
The Production Ramp
According to CFO Ryan Corbett, MP’s Mountain Pass facility in California produces NdPr oxide at a pace of about 1,000 metric tons per quarter, which the company is aiming to increase to full capacity. Corbett highlighted that the only meaningful historical comparable is Australia’s Lynas Rare Earths, which brought a similarly scaled separation operation online over a decade ago and took nearly seven years to reach full run-rate. MP’s second-quarter results revealed NdPr sales volumes exceeding 1,000 tons for the second consecutive quarter, up 127% year-over-year, with adjusted EBITDA increasing to a positive $28.5 million from a $12.5 million loss in the same quarter last year.
Magnets and the GM Relationship
On the magnet front, CEO James Litinsky stated on the company’s Q2 earnings call that MP Materials Corp. has already delivered magnets to General Motors Company for in-vehicle qualification and regulatory testing, with commercial shipments set to begin in the fourth quarter of 2026, starting with modest volumes. The two companies inked a long-term supply arrangement in April 2022, long before MP had any commercial magnet production capability, thus betting years in advance that MP could establish the manufacturing base required to serve it. That gamble began to pay off in March 2025, when magnetic precursor product deliveries to GM began, and the connection is likely to strengthen further this quarter with actual finished-magnet delivery.
Hedge fund holdings of MP Materials Corp. decreased marginally, from 52 in the first quarter to 50 in the second. General Motors Company experienced a similar modest drop, from 77 funds to 75 during the same time, implying that hedge fund positioning in both names was relatively stable leading into this update.
Bull vs. Bear: Can MP Turn Production Progress Into Commercial Scale?
The case for MP’s story being more than just a policy talking point at this point is based on hard production numbers: sales volumes have surpassed 1,000 tons for two consecutive quarters, adjusted EBITDA has shifted positive, and the company has already delivered qualification-stage magnets to GM ahead of the planned commercial ramp.
The case for caution is that Corbett’s own historical comparison, Lynas Rare Earths taking nearly seven years to reach full run-rate at a similarly scaled facility, serves as a reminder that MP’s ambitious ramp timeline may still slip, and commercial magnet deliveries to GM, while reaffirmed again this quarter, have yet to begin.
Insider Monkey’s Verdict
Investors should consider the fourth quarter of 2026 as the true proving point for this story, since that is when MP Materials Corp. has continuously stated that commercial magnet shipments to General Motors Company will pick up after years of anticipation. A successful, on-timestart would validate MP’s ability to move into commercial magnet production, though investors will still need to see how quickly volumes scale from the modest levels expected initially. Any further delay would raise new concerns about the company’s repeated timeline commitments.
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