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BCS

Changes in Beneficial Ownership · 4

Terrestrial Energy Inc.

IMSRNASDAQEQUITYCurrent

Changes in Beneficial Ownership

Filed Oct 15, 2026Accepted Oct 15, 2026, 5:42 PM EDTFiling CIK 2019804Accession 0001193125-26-423068
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Structured filing — 4

ownership.xml

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Filing details

Report period
2026-10-14
Issuer
Terrestrial Energy Inc. /DE/
Issuer CIK
0002019804
Trading symbol
IMSR

Reporting owner 1

Name
Pardee Charles G
Reporting owner CIK
0001544340
Relationship
Director
Address
C/O TERRESTRIAL ENERGY INC., 2730 W. TYVOLA ROAD, SUITE 100, CHARLOTTE, NC, 28217

Non-derivative transactions

Non-derivative transactions · 1 reported row
SecurityTransaction dateCodeAmountA / DPrice (USD)Owned afterOwnership
Common Stock2026-10-14P · Form 47,500A2.9514,258D
Table key
P · Form 4
Purchase on the market or privately
A
Acquired
D
Direct

Signature 1

Signed
/s/ Brian Thrasher, as Attorney-in-Fact
Date
2026-10-15

Company context

Terrestrial Energy is a developer of Generation IV nuclear plants that use its proprietary Integral Molten Salt Reactor (IMSR). The IMSR captures the transformative operating benefits of molten salt reactor technology in a plant design that represents true innovation in capital efficiency, cost reduction, versatility and functionality of nuclear energy supply. IMSR plants are designed to be small and modular for distributed supply of low-cost, reliable, dispatchable, clean, high-temperature industrial heat and electricity, and to be customized for a dual-use energy role relevant to many industrial applications, such as petrochemical and chemical synthesis, and data center operation. In so doing, IMSR plants extend the application of nuclear energy far beyond electric power markets. Their deployment will support the rapid growth of clean firm heat and power, delivering energy self-reliance, grid reliability and economic growth. Terrestrial Energy uses an innovative plant design together with proven and demonstrated molten salt reactor technology and readily-available and inexpensive standard-assay low-enriched uranium in its fuel for a nuclear plant with a unique set of operating characteristics and compelling transformative commercial potential. Terrestrial Energy is engaged with regulators, suppliers, industrial partners and energy end-users to build, license and commission the first IMSR plants in the early 2030s.

Current securities

Historical securities (3)

Recent company filings

  1. Other EventsOct 27, 2026
  2. 4 filingOct 13, 2026
  3. 424B3 filingAug 14, 2026
  4. 10-Q filingAug 11, 2026
  5. Results of Operations and Financial ConditionAug 11, 2026

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