---
schema_version: "secwatch.filing_event.v1"
accession: "0001213900-26-080645"
form_type: "8-K"
ticker: "USAR"
cik: "0001970622"
company_name: "USA Rare Earth, Inc."
filed_at: "2026-07-23T12:32:44+00:00"
generated_at: "2026-07-23T12:35:12.623346+00:00"
event_type: "other_material"
sentiment: "positive"
materiality_score: 0.75
calibrated_materiality_score: 0.75
confidence: "high"
source: SEC EDGAR
---

# USA Rare Earth invests EUR 22.5M for 13.6% stake in Carester, secures rare earth oxide access

## Summary
- USAR to invest EUR 22.5M (cash + stock) for ~13.6% of Carester; InfraVia invests EUR 22.5M for similar stake.
- Carester's Caremag facility in Lacq, France to start Q4 2026, producing NdPr, Dy, Tb oxides.
- USAR subsidiary LCM Europe to purchase portion of Carester's oxide output; USAR gains access to Carester's separation IP.
- Investment part of broader partnership to build integrated rare earth platform in Lacq, with French government support up to €130M.
- Completion expected Q3 2026, subject to conditions including Rhodia exit.

## SEC filing metadata
- accession: 0001213900-26-080645
- form_type: 8-K
- ticker: USAR
- cik: 0001970622
- company_name: USA Rare Earth, Inc.
- filed_at: 2026-07-23T12:32:44+00:00
- event_type: other_material
- sentiment: positive
- materiality_score: 0.75
- calibrated_materiality_score: 0.75
- confidence: high
- sec_items: 3.02, 8.01, 7.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1970622/000121390026080645/0001213900-26-080645-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1970622/000121390026080645/ea0299001-8k_usarare.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001213900-26-080645
- JSON: https://secwatch.observer/filing/0001213900-26-080645.json
- Plain text: https://secwatch.observer/filing/0001213900-26-080645.txt

This AI-assisted summary is a reading aid. Review the linked SEC EDGAR filing before relying on any specific claim.