Terrestrial Energy (IMSR) EVP Pamela Cowan submits initial insider Form 3

Rhea-AI Filing Summary

Terrestrial Energy Inc. is identified as the issuer in a Form 3 that names Pamela Beth Cowan, EVP, Engineering, as a reporting person. The Form 3 shows no insider stock transactions in the provided data, and the remarks reference Exhibit 24.1, a Power of Attorney.

Key Terms

Power of Attorney, Reporting person, Form 3

3 terms

Power of Attorney regulatory

"Remarks reference "Exhibit 24.1 - Power of Attorney""

A power of attorney is a legal document that allows one person to make decisions and act on behalf of another person, often in financial or legal matters. It’s like giving someone a trusted helper or agent the authority to handle important tasks if you are unable to do so yourself. This matters to investors because it can impact how their assets are managed or transferred if they become unable to oversee their affairs.

Reporting person regulatory

"The Form 3 names Pamela Beth Cowan as a reporting person"

Form 3 regulatory

"Initial statement of beneficial ownership is reported on Form 3"

Form 3 is the initial public filing that officers, directors and large shareholders must submit to report their ownership of a company’s securities when they become insiders. It acts like an opening inventory sheet that gives investors a starting point to see who holds significant stakes and to spot later trades or potential conflicts of interest, helping assess insider confidence and transparency.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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FAQ

What does Terrestrial Energy Inc. (IMSR) report in Pamela Beth Cowan's Form 3?

Terrestrial Energy Inc. reports an initial Form 3 naming Pamela Beth Cowan, EVP, Engineering, as a reporting person. The Form 3 data show no insider stock transactions, and the remarks reference Exhibit 24.1 as a Power of Attorney connected to the authorization.

Who is Pamela Beth Cowan at Terrestrial Energy (IMSR), and why is she listed on Form 3?

Pamela Beth Cowan is identified as EVP, Engineering at Terrestrial Energy Inc. Her role as an executive officer makes her a reporting person for SEC purposes, so her initial beneficial ownership information is captured on this Form 3.

Does the Form 3 for Terrestrial Energy (IMSR) show any insider stock transactions?

The Form 3 data show no reported insider stock transactions. Transaction counts for buys, sells, exercises, gifts, and other categories are all zero, indicating that this document serves as an initial ownership statement rather than a record of trading activity.

What is the significance of "Exhibit 24.1 - Power of Attorney" in IMSR's Form 3?

The remark "Exhibit 24.1 - Power of Attorney" indicates that a Power of Attorney accompanies the Form 3. This typically authorizes designated individuals to sign and submit SEC forms on behalf of the reporting person, streamlining future regulatory reporting.

How does this Form 3 affect shareholders of Terrestrial Energy (IMSR)?

Form 3 provides transparency on insider status by identifying Pamela Beth Cowan as a reporting executive at Terrestrial Energy. While it reports no transactions, it establishes the regulatory framework for future disclosures of her beneficial ownership and trading activity.

SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0104
Estimated average burden
hours per response:			0.5

1. Name and Address of Reporting Person^*

Cowan Pamela Beth

(Last) (First) (Middle)

C/O TERRESTRIAL ENERGY INC.

2730 W. TYVOLA ROAD, SUITE 100

(Street)

CHARLOTTE NORTH CAROLINA 28217

(City) (State) (Zip)

UNITED STATES

(Country)

2. Date of Event Requiring Statement (Month/Day/Year)
07/29/2026

3. Issuer Name and Ticker or Trading Symbol
Terrestrial Energy Inc. /DE/ [ IMSR ]

3a. Foreign Trading Symbol

5. If Amendment, Date of Original Filed (Month/Day/Year)

4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	EVP, Engineering

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

Remarks:

Exhibit 24.1 - Power of Attorney

No securities are beneficially owned.

	/s/ Brian Thrasher, Attorney-in-Fact	07/31/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 5 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 3: SEC 1473 (03-26)