---
schema_version: "secwatch.filing_event.v1"
accession: "0002019804-26-000021"
form_type: "8-K"
ticker: "IMSR"
cik: "0002019804"
company_name: "Terrestrial Energy Inc. /DE/"
filed_at: "2026-07-31T20:06:01+00:00"
generated_at: "2026-07-31T20:07:23.651981+00:00"
event_type: "leadership"
sentiment: "neutral"
materiality_score: 0.3
calibrated_materiality_score: 0.3
confidence: "high"
source: SEC EDGAR
---

# Director Shawn Matthews resigns from Terrestrial Energy board effective July 27, 2026

## Summary
- Shawn Matthews resigned from the Board of Directors on July 27, 2026.
- Resignation not due to any disagreement with company operations, policies, or practices.
- No replacement director has been announced as of the filing date.

## SEC filing metadata
- accession: 0002019804-26-000021
- form_type: 8-K
- ticker: IMSR
- cik: 0002019804
- company_name: Terrestrial Energy Inc. /DE/
- filed_at: 2026-07-31T20:06:01+00:00
- event_type: leadership
- sentiment: neutral
- materiality_score: 0.3
- calibrated_materiality_score: 0.3
- confidence: high
- sec_items: 5.02
- EDGAR index: https://www.sec.gov/Archives/edgar/data/2019804/000201980426000021/0002019804-26-000021-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/2019804/000201980426000021/tmb-20260727x8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0002019804-26-000021
- JSON: https://secwatch.observer/filing/0002019804-26-000021.json
- Plain text: https://secwatch.observer/filing/0002019804-26-000021.txt

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