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Terrestrial Energy Inc. /DE/IMSR

Class A IMSRWarrants IMSRWCIK 0002019804

Cash in trust

—

Not yet disclosed

Trust per share

—

Redemption value

IPO

Aug 2024

$226M raised

Combination deadline

—

Not disclosed

Filings on record

183

Latest Oct 30, 2026

Business combination

Target
Not disclosed in an indexed filing
Announced
Mar 26, 2025
Closed
Nov 3, 2025

Overview

Terrestrial Energy Inc. /DE/ is a special purpose acquisition company incorporated in Delaware and registered with the SEC under CIK 0002019804. It completed its initial public offering in Aug 2024, raising $226M in gross proceeds and listing on Nasdaq. Class A shares trade under the ticker IMSR, warrants under IMSRW on Nasdaq. Business combination closed; the company trades under a new ticker.

How busy it has been

Filings per month since the first one. A vehicle that has gone quiet with a deadline ahead is a different proposition from one that is still working.

221102024-042026-10

183 filings in all. 11 in the last three months, against a busiest month of 22.

News on Terrestrial Energy Inc. /DE/

Last 90 days

News sentiment

Neutral
negativeneutralpositive

Across 12 recent stories, weighted towards the newest. Scored by our own headline classifier using finance- and SPAC-specific terms. It reads what a story is about, not what the shares are worth.

SEC filing history

Free tier: filings older than 24 hours
  • 4

    Statement of changes in beneficial ownership

    Accession 0001193125-26-440015

    Oct 30, 2026

    1d ago

    View on EDGAR ↗
  • 8-K

    Other events

    Item 8.01 · Accession 0002019804-26-000030

    Oct 27, 2026

    4d ago

    View on EDGAR ↗
  • 4

    Statement of changes in beneficial ownership

    Accession 0001193125-26-432264

    Oct 26, 2026

    5d ago

    View on EDGAR ↗
  • 4

    Statement of changes in beneficial ownership

    Accession 0001193125-26-427979

    Oct 21, 2026

    10d ago

    View on EDGAR ↗
  • 3

    Initial statement of beneficial ownership

    Accession 0001193125-26-427975

    Oct 21, 2026

    10d ago

    View on EDGAR ↗
  • 4

    Statement of changes in beneficial ownership

    Accession 0001193125-26-423068

    Oct 15, 2026

    16d ago

    View on EDGAR ↗
  • 4

    Statement of changes in beneficial ownership

    Accession 0001193125-26-421089

    Oct 14, 2026

    17d ago

    View on EDGAR ↗
  • 4

    Statement of changes in beneficial ownership

    Accession 0001193125-26-420002

    Oct 13, 2026

    18d ago

    View on EDGAR ↗
  • 424B3

    Prospectus supplement

    Accession 0002019804-26-000027

    Aug 14, 2026

    2mo ago

    View on EDGAR ↗
  • 10-Q

    Quarterly report

    Accession 0001104659-26-094085

    Aug 11, 2026

    2mo ago

    View on EDGAR ↗
  • 8-K

    Current report

    Items 2.02, 9.01 · Accession 0001104659-26-093776

    Aug 11, 2026

    2mo ago

    View on EDGAR ↗
  • 4

    Statement of changes in beneficial ownership

    Accession 0001193125-26-328808

    Jul 31, 2026

    3mo ago

    View on EDGAR ↗
  • 3

    Initial statement of beneficial ownership

    Accession 0001193125-26-328703

    Jul 31, 2026

    3mo ago

    View on EDGAR ↗
  • 8-K

    Current report

    Item 5.02 · Accession 0002019804-26-000021

    Jul 31, 2026

    3mo ago

    View on EDGAR ↗
  • 8-K

    Regulation FD disclosure

    Items 5.02, 7.01, 9.01 · Accession 0002019804-26-000018

    Jul 28, 2026

    3mo ago

    View on EDGAR ↗
  • 4

    Statement of changes in beneficial ownership

    Accession 0001193125-26-318233

    Jul 27, 2026

    3mo ago

    View on EDGAR ↗
  • 3

    Initial statement of beneficial ownership

    Accession 0001193125-26-318156

    Jul 27, 2026

    3mo ago

    View on EDGAR ↗
  • 8-K

    Regulation FD disclosure

    Items 7.01, 9.01 · Accession 0002019804-26-000013

    Jul 21, 2026

    3mo ago

    View on EDGAR ↗
  • 8-K

    Current report

    Item 5.02 · Accession 0002019804-26-000006

    Jul 17, 2026

    3mo ago

    View on EDGAR ↗
  • 8-K

    Submission of matters to a vote of security holders

    Item 5.07 · Accession 0001104659-26-073471

    Jun 12, 2026

    4mo ago

    View on EDGAR ↗
  • EFFECT

    Notice of effectiveness

    Accession 9999999995-26-001960

    Jun 12, 2026

    4mo ago

    View on EDGAR ↗
  • POS AM

    POS AM

    Accession 0001104659-26-071014

    Jun 5, 2026

    4mo ago

    View on EDGAR ↗
  • S-8

    S-8

    Accession 0001104659-26-063860

    May 19, 2026

    5mo ago

    View on EDGAR ↗
  • 424B3

    Prospectus supplement

    Accession 0001104659-26-061280

    May 14, 2026

    5mo ago

    View on EDGAR ↗
  • 424B3

    Prospectus supplement

    Accession 0001104659-26-061279

    May 14, 2026

    5mo ago

    View on EDGAR ↗
  • 10-Q

    Quarterly report

    Accession 0001104659-26-061234

    May 14, 2026

    5mo ago

    View on EDGAR ↗
  • 8-K

    Current report

    Items 2.02, 9.01 · Accession 0001104659-26-060716

    May 14, 2026

    5mo ago

    View on EDGAR ↗
  • 8-K

    Current report

    Item 5.02 · Accession 0001104659-26-057977

    May 8, 2026

    5mo ago

    View on EDGAR ↗
  • ARS

    ARS

    Accession 0001104659-26-051687

    Apr 29, 2026

    6mo ago

    View on EDGAR ↗
  • DEFA14A

    Additional proxy soliciting material

    Accession 0001104659-26-051678

    Apr 29, 2026

    6mo ago

    View on EDGAR ↗

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Terrestrial Energy Inc. /DE/: questions answered

What is Terrestrial Energy Inc. /DE/ (IMSR)?

Terrestrial Energy Inc. /DE/ is a special purpose acquisition company incorporated in Delaware and registered with the SEC under CIK 0002019804. It completed its initial public offering in Aug 2024, raising $226M in gross proceeds and listing on Nasdaq. Class A shares trade under the ticker IMSR, warrants under IMSRW on Nasdaq. Business combination closed; the company trades under a new ticker.

How much does Terrestrial Energy Inc. /DE/ hold in trust?

No trust balance has been disclosed in a filing we have indexed for Terrestrial Energy Inc. /DE/. For a newly priced IPO this is normal: the figure first appears in the quarterly report after closing.

When must Terrestrial Energy Inc. /DE/ complete a merger?

No combination deadline appears in the filings we have indexed. The date is stated in the charter and repeated in each quarterly report; where our parser could not establish it with confidence we leave it blank rather than infer one.

What happens if Terrestrial Energy Inc. /DE/ does not find a target in time?

The charter requires the vehicle to redeem 100% of the public shares and return the trust, pro rata, to public shareholders. That is the mechanism working as designed rather than a default. Founder shares and warrants are worthless in that outcome, which is why the sponsor's incentive is to get a deal done or to buy more time. Across the market, deadline lapsed without a deal; trust returned to public shareholders.

Can I redeem shares in Terrestrial Energy Inc. /DE/, and at what price?

Public shareholders may elect to redeem in connection with a combination vote and at each extension vote, at the pro-rata trust value on the relevant record date. Redemption is a right attached to the public shares only; warrants and rights carry no claim on the trust. The mechanics and the deadline for electing are set out in the proxy statement for the vote in question.

What tickers does Terrestrial Energy Inc. /DE/ trade under?

Class A shares trade as IMSR on Nasdaq, and the warrants as IMSRW. Units trade first and separate into their component securities roughly 52 days after the IPO; only the Class A shares carry the redemption right against the trust.

Is the trust value the same as the share price for Terrestrial Energy Inc. /DE/?

No. Trust per share is a disclosed, contractual figure: what a redeeming holder receives. The market price is whatever the shares change hands at, which can sit above the trust when a deal is well received or below it when the market doubts one will close. We do not have a current quote for this vehicle, so no spread is shown.

Is Terrestrial Energy Inc. /DE/ tradeable, and where?

Yes. IMSR returned a live quote of $3.22 on Nasdaq. Quotes here are delayed and refreshed on a schedule rather than streamed, so treat the figure as indicative and confirm on your own venue. Units and warrants trade under their own symbols and are quoted separately.

Is Terrestrial Energy Inc. /DE/ a good investment?

That is not a question this site answers. Terrestrial Energy Inc. /DE/ is covered here as reference data: what the company filed, when it filed it, and what the numbers in those filings say. The Edge, FOMO and Potential scores on this page are derived measures with a published formula, not ratings of investment merit: they describe the setup, and every component is shown so you can take them apart. We publish no price targets and no recommendations, and nothing here should be read as advice. The figures are a starting point for your own work, and each one carries the accession number of the filing it came from.

Where does this Terrestrial Energy Inc. /DE/ data come from?

Filings Terrestrial Energy Inc. /DE/ submitted to the SEC under CIK 0002019804: the registration statement and final prospectus for the structure, quarterly and annual reports for the trust, current reports and proxy statements for deals, votes and extensions. Trust economics are taken from the registrant's own XBRL tags rather than parsed from prose, which is why they are exact. Every filing in the history above is listed with its accession number, which identifies the document uniquely on EDGAR; Pro accounts open it directly from the row.

Compiled by the SPACListing research desk

Last reconciled Nov 1, 2026

Every figure on this page is read from documents the registrants filed with the U.S. Securities and Exchange Commission, principally the IPO prospectus (Form 424B4), quarterly and annual reports, current reports and proxy statements, the registrant's own XBRL tags for trust economics. Nothing is sourced from press coverage, from the companies themselves, or from a third-party aggregator. Where a filing does not disclose something, the field is left blank rather than estimated.

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