---
schema_version: "secwatch.filing_event.v1"
accession: "0001970622-26-000026"
form_type: "8-K"
ticker: "USAR"
cik: "0001970622"
company_name: "USA Rare Earth, Inc."
filed_at: "2026-04-09T23:59:59+00:00"
generated_at: "2026-05-15T06:49:53.773587+00:00"
event_type: "m_and_a"
sentiment: "positive"
materiality_score: 0.65
calibrated_materiality_score: 0.65
confidence: "high"
source: SEC EDGAR
---

# USA Rare Earth to acquire ~12.5% stake in Carester SAS; partners with InfraVia

## Summary
- Each of USA Rare Earth and InfraVia to hold approximately 12.5% equity interests in Carester.
- Partnership includes right to purchase Carester's oxide output and access to its separation IP and recycling tech.
- Carester to get long-term heavy rare earth feedstock from USA Rare Earth's Round Top deposit (expected commercial ops late 2028).
- French government supports LCM Europe metallization project: up to €130M in credits and potential state guarantee for 50% of commercial debt.
- Carester's Caremag magnet recycling and heavy REE separation facility in Lacq, France scheduled for commissioning late 2026.

## SEC filing metadata
- accession: 0001970622-26-000026
- form_type: 8-K
- ticker: USAR
- cik: 0001970622
- company_name: USA Rare Earth, Inc.
- filed_at: 2026-04-09T23:59:59+00:00
- event_type: m_and_a
- sentiment: positive
- materiality_score: 0.65
- calibrated_materiality_score: 0.65
- confidence: high
- sec_items: 7.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1970622/000197062226000026/0001970622-26-000026-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1970622/000197062226000026/usar-20260409.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001970622-26-000026
- JSON: https://secwatch.observer/filing/0001970622-26-000026.json
- Plain text: https://secwatch.observer/filing/0001970622-26-000026.txt

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