---
schema_version: "secwatch.filing_event.v1"
accession: "0001213900-25-103554"
form_type: "8-K"
ticker: "IMSR"
cik: "0002019804"
company_name: "Terrestrial Energy Inc. /DE/"
filed_at: "2025-10-29T23:59:59+00:00"
generated_at: "2026-05-17T01:45:00.068055+00:00"
event_type: "m_and_a"
sentiment: "neutral"
materiality_score: 0.75
confidence: "high"
source: SEC EDGAR
---

# Terrestrial Energy completes de-SPAC merger; trades on Nasdaq as IMSR/IMSRW

## Summary
- HCM II Acquisition Corp domesticated to Delaware corp Oct 23, 2025; merger with Legacy Terrestrial Energy closed Oct 28.
- New Terrestrial Energy common stock (IMSR) and warrants (IMSRW) began trading on Nasdaq on Oct 29, 2025.
- 7,390 HCM II Class A shares redeemed at $10.54/share; aggregate redemption ~$77,890.
- Company renamed from HCM II Acquisition Corp to Terrestrial Energy Inc.
- The business combination was approved at the extraordinary general meeting on Oct 20, 2025.

## SEC filing metadata
- accession: 0001213900-25-103554
- form_type: 8-K
- ticker: IMSR
- cik: 0002019804
- company_name: Terrestrial Energy Inc. /DE/
- filed_at: 2025-10-29T23:59:59+00:00
- event_type: m_and_a
- sentiment: neutral
- materiality_score: 0.75
- confidence: high
- sec_items: 3.03, 5.03, 8.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/2019804/000121390025103554/0001213900-25-103554-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/2019804/000121390025103554/ea0263000-8k_terrestrial.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001213900-25-103554
- JSON: https://secwatch.observer/filing/0001213900-25-103554.json
- Plain text: https://secwatch.observer/filing/0001213900-25-103554.txt

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