USA Rare Earth Closes Serra Verde Deal — Brazil Mine and Oklahoma Magnet Facility Now Share an Owner

USA Rare Earth completed its combination with Serra Verde on September 3, putting Serra Verde's Brazilian rare-earth operation under the same corporate owner as USA Rare Earth's developing magnet-manufacturing business. The closing filing lists merger consideration of $300 million in cash plus 126,849,307 USA Rare Earth shares.¹

That is the new step. The acquisition agreement itself dates to April, but the September closing changes legal ownership.¹ For the EV supply chain, the important distinction is what the deal now puts under one company — and what the public record still does not show.

Rare-earth permanent magnets are widely used in hybrid and plug-in electric-vehicle traction motors, according to the U.S. Department of Energy, although permanent-magnet motors are only one of several traction-motor architectures.² USA Rare Earth now controls an upstream operation producing rare-earth material in Brazil while continuing to develop downstream magnet capacity in the United States. That makes the combination relevant to EV motor supply without establishing that the two ends are already connected by a working material flow.

What is now under one owner

Serra Verde's Pela Ema mining and processing operation in Goiás entered commercial production of mixed rare-earth carbonate in January 2024.³ Serra Verde says its material contains magnetic rare earths including neodymium, praseodymium, terbium and dysprosium.³ Those resource and product descriptions come from the operator; they should not be read as independent proof of every market-position claim Serra Verde or USA Rare Earth makes about the asset.

On the downstream side, USA Rare Earth commissioned Phase 1a of its sintered NdFeB magnet line in Stillwater, Oklahoma, in March 2026.⁴ But its quarterly filing for the period ended June 30 shows a business still in transition: the company said it had not yet generated revenue from neo-magnet manufacturing or mineral production, and the filing described Stillwater as working through qualification, feedstock procurement and ramp activity even while also saying commercial production had commenced.⁴

That mixed language matters. Calling Stillwater either a fully ramped magnet operation or a facility that has not begun production would flatten the company's own more complicated status as of the June reporting date.

USA Rare Earth's September closing release describes Serra Verde as joining a broader platform spanning processing, metallization and magnet making.⁵ That is a company description of the combined strategy. The transaction itself verifies common ownership; it does not by itself verify that each step is already operating as one continuous production chain.

Ownership is not the same as material flow

The reviewed closing filing and latest quarterly filing do not establish that Serra Verde feedstock is already being separated, metallized and turned into magnets at Stillwater.¹⁴ They also do not identify a specific automaker buying Serra Verde material or Stillwater magnets in connection with this closing.¹⁴

That boundary is especially important because a corporate combination can happen before the operating pieces are fully integrated. USA Rare Earth's own closing announcement discusses integration and future execution, while its June filing still documented qualification and ramp work at Stillwater.⁵⁴

So the September 3 milestone is narrower than a completed mine-to-motor supply chain: USA Rare Earth now owns Serra Verde's producing Brazilian upstream operation while also owning the Oklahoma magnet facility it is ramping. A traceable Serra Verde-to-Stillwater material flow, magnet revenue from that chain or a named automotive customer would be a separate operational milestone that the sources reviewed for this story do not yet establish.¹⁴³

Sources

Footnotes

1. USA Rare Earth Form 8-K — USA Rare Earth / U.S. Securities and Exchange Commission, filed Sept. 4, 2026. https://www.sec.gov/Archives/edgar/data/1970622/000121390026097399/ea0304001-8k_usarare.htm Establishes the Sept. 3 merger closing and effectiveness, the April agreement chronology, and consideration of $300 million cash plus 126,849,307 shares. It does not independently establish future integration benefits, production volumes or customer demand. ↩ ↩² ↩³ ↩⁴ ↩⁵

2. Electric Motors Research and Development — U.S. Department of Energy, current background page observed Sept. 6, 2026. https://www.energy.gov/cmei/vehicles/electric-motors-research-and-development Establishes that rare-earth permanent magnets are widely used in hybrid and plug-in EV traction motors and that multiple traction-motor architectures exist; it does not establish any USA Rare Earth automotive customer or production status. ↩

3. Serra Verde Enters Commercial Production — Serra Verde Group, Jan. 11, 2024. https://www.serraverde.com/2024/01/serra-verde-enters-commercial-production/ Operator announcement establishing the start of commercial production of mixed rare-earth carbonate at Pela Ema and providing Serra Verde's description of the material's rare-earth content. Operator targets and market-position claims remain interested-party assertions. ↩ ↩² ↩³

4. USA Rare Earth Q2 2026 Quarterly Report (Form 10-Q) — USA Rare Earth / U.S. Securities and Exchange Commission, filed Aug. 10, 2026; reporting period ended June 30, 2026. https://www.sec.gov/Archives/edgar/data/1970622/000197062226000057/usar-20260630.htm Establishes the reporting-period status of Stillwater commissioning, qualification, feedstock procurement, ramp work and the absence of neo-magnet/mineral-production revenue through June 30. Its reporting cutoff precedes the September closing. ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶

5. USA Rare Earth Completes Combination with Serra Verde Group — USA Rare Earth, Sept. 4, 2026. https://www.sec.gov/Archives/edgar/data/1970622/000121390026097399/ea030400101ex99-1.htm Company closing announcement describing the combined asset platform and future integration/ramp plans. Strategic benefits, superlatives and forward-looking operating claims are interested-party statements. ↩ ↩²