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USA Rare Earth Buys 13.6% Stake in France's Carester to Secure Non-China Supply

USA Rare Earth Buys 13.6% Stake in France's Carester to Secure Non-China Supply
Markets · 2026
Photo · Eleanor Whitfield for Daily Digest Invest
By Eleanor Whitfield Markets Editor-in-Chief Jul 23, 2026 4 min read

USA Rare Earth has agreed to acquire a 13.6% stake in France's Carester, a move that funds a new rare earth processing facility in Lacq, France, and secures the US company access to rare earth oxides sourced outside China. The deal, reported by Reuters, underscores the growing push by Western nations to reduce reliance on Chinese supply chains for critical minerals used in high-tech and defense industries.

What the Deal Involves

The investment will help finance Carester's planned processing site in Lacq, in southwestern France. Rare earth oxides are a crucial intermediate product: mined rare earth ore must be separated and processed into oxides before it can be used to make high-performance magnets. These magnets are essential components in electric vehicle motors, wind turbine generators, and advanced defense systems.

China currently dominates this processing stage, controlling roughly 90% of global rare earth oxide output, according to Reuters. That concentration poses a strategic risk for countries like the US and those in Europe, which are racing to build alternative supply chains. USA Rare Earth's stake in Carester gives it a direct line to processed material that does not pass through China, a key advantage as demand for rare earths grows.

Why Rare Earths Matter for Investors

Rare earth elements are not actually rare in the earth's crust, but they are difficult and costly to mine and process in an environmentally responsible way. The market is small compared to commodities like copper or oil, but it is strategically vital. For everyday investors, the significance lies in the broader trend: governments and companies are pouring money into securing critical mineral supply chains, which could create opportunities in mining, processing, and recycling firms.

This deal fits a pattern of Western efforts to diversify rare earth sources. The US Department of Defense and the European Union have both funded projects to develop domestic processing capacity. For example, the US has backed MP Materials' Mountain Pass mine in California, while Europe has supported projects in Sweden and Estonia. USA Rare Earth's move into France adds another piece to that puzzle.

Investors should also note that rare earth prices can be volatile. They are influenced by Chinese export policies, geopolitical tensions, and shifts in demand from industries like EVs and wind energy. A recent spike in costs for Japanese manufacturers, as covered in our article Rare Earth Costs Jump 22% for Japanese Manufacturers, Squeezing Margins, highlights how supply chain disruptions can hit corporate profits.

What It Means for the Market

The deal is relatively small in financial terms, but it signals a strategic shift. By taking a minority stake in a French processor, USA Rare Earth gains a foothold in Europe's emerging rare earth ecosystem. The Lacq facility is expected to process material from various sources, potentially including recycled magnets and mined ore from outside China.

For investors, the key takeaway is that the rare earth supply chain is slowly becoming more diversified. This could reduce the risk of sudden price spikes or shortages that have historically hurt manufacturers. However, building new processing capacity takes years and requires significant capital. The success of projects like Lacq will depend on consistent policy support, technological advances, and market demand.

In the broader context of critical minerals, this deal echoes other moves in the sector. For instance, Zimbabwe's lithium export ban, discussed in our article Zimbabwe's Lithium Export Ban Faces Processing Hurdle as Only Plant Refuses Third-Party Ore, shows how countries are trying to capture more value from their resources. Similarly, the push for rare earth independence is part of a larger trend toward supply chain resilience.

Looking Ahead

USA Rare Earth and Carester will now work to bring the Lacq facility online. The timeline and capacity of the plant have not been disclosed, but investors should watch for updates on construction milestones and offtake agreements. If successful, the project could serve as a model for other Western rare earth ventures.

For now, the deal is a modest but meaningful step in reducing China's grip on rare earth processing. It gives USA Rare Earth a strategic asset and signals that the race to build non-Chinese supply chains is accelerating. As always, investors should monitor developments in this space, but avoid making bets based on single deals. Diversification and patience remain key in this niche but important market.

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