---
schema_version: "secwatch.filing_event.v1"
accession: "0001213900-25-105304"
form_type: "8-K"
ticker: "IMSR"
cik: "0002019804"
company_name: "Terrestrial Energy Inc. /DE/"
filed_at: "2025-11-03T23:59:59+00:00"
generated_at: "2026-05-17T00:57:46.592956+00:00"
event_type: "m_and_a"
sentiment: "neutral"
materiality_score: 0.85
confidence: "high"
source: SEC EDGAR
---

# Terrestrial Energy completes de-SPAC merger; shares start trading Oct 29 on Nasdaq under IMSR

## Summary
- Business combination closed Oct 28; Legacy Terrestrial Energy becomes wholly owned sub of New Terrestrial Energy.
- Exchange ratio of 44.7029 applied; issued ~47.7M common shares to legacy securityholders.
- PIPE investors contributed $50M at $10/share for 5M shares.
- Sponsor and key holders subject to 12-month lock-up; early release triggers at VWAP of $15 and $20.
- Common and warrants begin Nasdaq trading Oct 29 under IMSR and IMSRW.

## SEC filing metadata
- accession: 0001213900-25-105304
- form_type: 8-K
- ticker: IMSR
- cik: 0002019804
- company_name: Terrestrial Energy Inc. /DE/
- filed_at: 2025-11-03T23:59:59+00:00
- event_type: m_and_a
- sentiment: neutral
- materiality_score: 0.85
- confidence: high
- sec_items: 1.01, 2.01, 5.02, 3.02, 9.01, 3.03, 5.01, 5.03, 5.05, 5.06
- EDGAR index: https://www.sec.gov/Archives/edgar/data/2019804/000121390025105304/0001213900-25-105304-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/2019804/000121390025105304/ea0263386-8k_terres.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001213900-25-105304
- JSON: https://secwatch.observer/filing/0001213900-25-105304.json
- Plain text: https://secwatch.observer/filing/0001213900-25-105304.txt

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