---
schema_version: "secwatch.filing_event.v1"
accession: "0002019804-26-000018"
form_type: "8-K"
ticker: "IMSR"
cik: "0002019804"
company_name: "Terrestrial Energy Inc. /DE/"
filed_at: "2026-07-28T20:35:43+00:00"
generated_at: "2026-07-28T20:37:06.396454+00:00"
event_type: "leadership"
sentiment: "neutral"
materiality_score: 0.45
calibrated_materiality_score: 0.45
confidence: "high"
source: SEC EDGAR
---

# Terrestrial Energy appoints nuclear industry veteran Kathryn McCarthy to Board; Q2 earnings call set for Aug 11

## Summary
- Kathryn McCarthy appointed to Board effective July 22, 2026; she is a member of National Academy of Engineering.
- McCarthy previously directed US ITER Project Office at Oak Ridge National Lab and held senior roles at Idaho National Lab.
- Company to report Q2 2026 earnings before market open on August 11, 2026; conference call at 8:30 a.m. ET.
- McCarthy's experience includes leadership at Canadian Nuclear Laboratories and over 25 years at Idaho National Laboratory.

## SEC filing metadata
- accession: 0002019804-26-000018
- form_type: 8-K
- ticker: IMSR
- cik: 0002019804
- company_name: Terrestrial Energy Inc. /DE/
- filed_at: 2026-07-28T20:35:43+00:00
- event_type: leadership
- sentiment: neutral
- materiality_score: 0.45
- calibrated_materiality_score: 0.45
- confidence: high
- sec_items: 5.02, 7.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/2019804/000201980426000018/0002019804-26-000018-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/2019804/000201980426000018/tmb-20260723x8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0002019804-26-000018
- JSON: https://secwatch.observer/filing/0002019804-26-000018.json
- Plain text: https://secwatch.observer/filing/0002019804-26-000018.txt

## Key facts
- Executive change
  Kathryn McCarthy was appointed as director at Terrestrial Energy Inc. /DE/.
  - Action: appointed
  - Role: director
  source text: On July 22, 2026, the Board of Directors (the "Board") of Terrestrial Energy Inc. (the “Company”) appointed Kathryn McCarthy to serve as a director of the Company, effective on July 22, 2026.
  evidence_url: https://www.sec.gov/Archives/edgar/data/2019804/000201980426000018/0002019804-26-000018-index.htm

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