---
schema_version: "secwatch.filing_event.v1"
accession: "0001104659-26-007880"
form_type: "8-K"
ticker: "IMSR"
cik: "0002019804"
company_name: "Terrestrial Energy Inc. /DE/"
filed_at: "2026-01-29T23:59:59+00:00"
generated_at: "2026-05-16T06:35:53.532274+00:00"
event_type: "other_material"
sentiment: "positive"
materiality_score: 0.75
confidence: "high"
source: SEC EDGAR
---

# Terrestrial Energy provides 2025 milestones and 2026 outlook; raised $292M in business combination

## Summary
- Completed business combination with HCM II, raising ~$292M gross proceeds and listing on Nasdaq under IMSR.
- Selected by Texas A&M to site a commercial IMSR plant at RELLIS campus; partnered with Ameresco for project development.
- Entered final phase of graphite irradiation tests at NRG PALLAS; received two DOE OTA awards for pilot reactor and fuel line.
- Fuel services agreement with Westinghouse; uses SALEU (<5% enriched U-235), avoiding HALEU supply challenges.
- 2026 priorities: TETRA pilot reactor criticality and TEFLA fuel salt pilot; targeting fleet deployment in the 2030s.

## SEC filing metadata
- accession: 0001104659-26-007880
- form_type: 8-K
- ticker: IMSR
- cik: 0002019804
- company_name: Terrestrial Energy Inc. /DE/
- filed_at: 2026-01-29T23:59:59+00:00
- event_type: other_material
- sentiment: positive
- materiality_score: 0.75
- confidence: high
- sec_items: 7.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/2019804/000110465926007880/0001104659-26-007880-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/2019804/000110465926007880/tmb-20260129x8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001104659-26-007880
- JSON: https://secwatch.observer/filing/0001104659-26-007880.json
- Plain text: https://secwatch.observer/filing/0001104659-26-007880.txt

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