STOCK TITAN

Terrestrial Energy (IMSR) sets 2026 exit date for General Counsel Millsap

Filing Impact
(Moderate)
Filing Sentiment
(Neutral)
Form Type
8-K

Rhea-AI Filing Summary

Terrestrial Energy Inc. reported an upcoming executive leadership change. The employment of Steven Millsap, who serves as General Counsel, Secretary and Chief Compliance Officer, will be ending effective September 12, 2026. This change affects the company’s top legal and compliance functions. Terrestrial Energy is incorporated in Delaware, and its common stock and redeemable warrants trade on The Nasdaq Stock Market under the symbols IMSR and IMSRW, respectively.

Positive

  • None.

Negative

  • General Counsel, Secretary and Chief Compliance Officer departure with the employment of Steven Millsap ending effective September 12, 2026, creating an upcoming transition in Terrestrial Energy’s senior legal and compliance leadership.
Item 5.02 Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers Governance
Key personnel changes including departures, elections, or appointments of directors and executive officers.
Par value of common stock $0.0001 per share Par value of Terrestrial Energy Inc. common stock
Warrant exercise price $11.50 per share Each whole redeemable warrant exercisable for one common stock at this price
Effective date of officer’s employment end September 12, 2026 Date when employment of General Counsel, Secretary and Chief Compliance Officer will be ending
Emerging growth company regulatory
"Emerging growth company"
An emerging growth company is a recently public or smaller public firm that qualifies for temporary, lighter regulatory and disclosure rules to reduce the cost and effort of being public. For investors, it means the company may provide less historical financial detail and face fewer reporting requirements than larger firms, so it can grow more quickly but also carries higher uncertainty—like buying a promising early-stage product with fewer user reviews.
Redeemable Warrants financial
"Redeemable Warrants, each whole warrant exercisable for one Common Stock"
A redeemable warrant is a tradable right that lets its holder buy a company’s shares at a fixed price before a set date, but the issuer has the contract power to cancel (redeem) the warrant early under agreed terms. For investors this matters because early redemption can force decision-making, change the timing of when new shares might be created, and affect potential gains or dilution—much like a store coupon that the issuer can cancel by paying you off instead of letting you use it.
Chief Compliance Officer other
"General Counsel, Secretary and Chief Compliance Officer of Terrestrial Energy Inc."
The chief compliance officer is the senior executive responsible for making sure a company follows laws, industry rules and its own internal policies, acting like a safety inspector for legal and ethical risks. Investors care because effective compliance reduces the chance of fines, lawsuits, operational disruption and reputational damage, so the officer’s competence and independence can materially affect future profits and risk exposure.

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

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FAQ

What leadership change did Terrestrial Energy Inc. (IMSR) disclose?

Terrestrial Energy disclosed that employment of Steven Millsap, its General Counsel, Secretary and Chief Compliance Officer, will be ending effective September 12, 2026. This represents a planned change in the company’s most senior legal and compliance roles.

When will Steven Millsap’s employment at Terrestrial Energy (IMSR) end?

The employment of Steven Millsap at Terrestrial Energy will be ending effective September 12, 2026. That date marks the scheduled conclusion of his service as General Counsel, Secretary and Chief Compliance Officer.

Which positions does Steven Millsap hold at Terrestrial Energy (IMSR)?

Steven Millsap currently serves as General Counsel, Secretary and Chief Compliance Officer of Terrestrial Energy Inc. His employment in these roles is scheduled to end effective September 12, 2026, affecting the company’s senior legal and compliance leadership.

On which exchange are Terrestrial Energy (IMSR) securities listed?

Terrestrial Energy’s common stock and redeemable warrants are listed on The Nasdaq Stock Market LLC. The common stock trades under the symbol IMSR and the redeemable warrants under IMSRW, each warrant exercisable for one share of common stock.

What are Terrestrial Energy’s (IMSR) listed securities and their symbols?

Terrestrial Energy has common stock, par value $0.0001 per share, trading under symbol IMSR, and redeemable warrants, each whole warrant exercisable for one common share at $11.50 per share, trading under symbol IMSRW on Nasdaq.
0002019804false0002019804imsr:RedeemableWarrantsEachWholeWarrantExercisableForOneCommonStockAtPriceOf11.50PerShareMember2026-07-142026-07-140002019804imsr:CommonStockParValue0.0001PerShareMember2026-07-142026-07-1400020198042026-07-142026-07-14

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): July 14, 2026

TERRESTRIAL ENERGY INC.

(Exact name of registrant as specified in its charter)

Delaware

  ​ ​ ​

001-42252

  ​ ​ ​

98-1785406

(State or other jurisdiction
of incorporation)

(Commission File Number)

(IRS Employer
Identification No.)

2730 W. Tyvola Road, Suite 100

Charlotte, NC 28217

(Address of principal executive offices, including zip code)

Registrant’s telephone number, including area code: (646) 687-8212

Not Applicable

(Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

 Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

 Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

 Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

 Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act

Title of each class

  ​ ​ ​

Trading
Symbol(s)

  ​ ​ ​

Name of each exchange
on which
registered

Common Stock, par value $0.0001 per share

 

IMSR

 

The Nasdaq Stock
Market LLC

Redeemable Warrants, each whole warrant exercisable for one Common
Stock at a price of $11.50 per share

 

IMSRW

 

The Nasdaq Stock
Market LLC

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.

Item 5.02 Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.

(b)The employment of Steven Millsap, General Counsel, Secretary and Chief Compliance Officer of Terrestrial Energy Inc., will be ending effective September 12, 2026.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

Date: July 17, 2026

TERRESTRIAL ENERGY INC.

 

 

 

By:

/s/ Simon Irish

 

Name:

Simon Irish

 

Title:

Chief Executive Officer

Filing Exhibits & Attachments

4 documents