As of November 6, 2026, Terrestrial Energy Inc. /DE/ has reported 4 leadership change filings to the SEC under Item 5.02 of Form 8-K, from April 16, 2026 to July 31, 2026, naming 1 appointment and 2 departures. The latest filing names Shawn Matthews, leaving (Form 8-K, July 31, 2026).
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Key facts
- · In / out: Out · Person: Shawn Matthews · Effective: 2026-07-27 · 8-K, 2026-07-31
- · In / out: In · Person: Kathryn McCarthy · Role: Director · Effective: 2026-07-22 · 8-K, 2026-07-28
- · In / out: Out · Person: David Hill · Effective: 2026-07-01 · 8-K, 2026-05-08
- · In / out: Reported · Person: not named in the filing · 8-K, 2026-04-16
Terrestrial Energy Inc. /DE/ reported changes in 4 filings among its directors and officers to the SEC on Form 8-K, Item 5.02, from 2026-04-16 to 2026-07-31. They name 3 people, with 1 appointment and 2 departures. Every row below is cited to the filing it comes from, and this page adds each new change as Terrestrial Energy Inc. /DE/ files it.
Also on the record for Terrestrial Energy Inc. /DE/
| Date | Record | Figure | Our page | Source |
|---|---|---|---|---|
| March 31, 2026 | Form D, private offering | $85K sold | Form D page | Source |
| February 17, 2026 | Stake report, Schedule 13G/A, by Kenneth Griffin | 2.2% of the class | 5%+ stakes | Source |
| January 22, 2026 | Stake report, Schedule 13G, by Roberto Marco Sella | 14.34% of the class | 5%+ stakes | Source |
| December 22, 2025 | IPO filing, Form S-1/A | — | IPO filings | Source |
| November 26, 2025 | IPO filing, Form S-1 | — | IPO filings | Source |
| November 12, 2025 | Stake report, Schedule 13G/A, by Linden Capital L.P. | 0.9% of the class | 5%+ stakes | Source |
| November 12, 2025 | Stake report, Schedule 13G/A, by MAGNETAR FINANCIAL LLC | 0.62% of the class | 5%+ stakes | Source |
| November 4, 2025 | Stake report, Schedule 13D, by David LeBlanc | 9.7% of the class | 5%+ stakes | Source |
| November 4, 2025 | Stake report, Schedule 13D, by Simon Irish | 12.8% of the class | 5%+ stakes | Source |
| September 30, 2025 | Stake report, Schedule 13G, by Kenneth Griffin | 5.4% of the class | 5%+ stakes | Source |
| August 14, 2025 | Stake report, Schedule 13G/A, by First Trust Capital Management L.P. | 4.66% of the class | 5%+ stakes | Source |
| August 14, 2025 | Stake report, Schedule 13G/A, by LMR Partners LLP | 4.1% of the class | 5%+ stakes | Source |
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More on Terrestrial Energy Inc. /DE/ and the records around it.
The people at Terrestrial Energy Inc. /DE/
- Charles Pardee, David Hill, David LeBlanc, Hugh MacDiarmid, Simon Irish and William Johnson are also named on 2 other Form D filings: Terrestrial Energy Inc. (Jul 2025)
- Brian Thrasher and Robert Jones are also named on 1 other Form D filing: Terrestrial Energy Inc. (Jul 2025)
Terrestrial Energy Inc. /DE/ elsewhere on the record
- Form D filing Mar 2026
- 5%+ stake filings Feb 2026
- Who owns it
Companies that share a holder
- Roberto Marco Sella also filed stake reports on 1 other company: OFFERPAD SOLUTIONS INC. (Oct 2025)
- Merus Global Investments, LLC also filed stake reports on 10 other companies: General Fusion Group Ltd. (Aug 2026), D. Boral ARC Acquisition I Corp. (Jun 2026), Bleichroeder Acquisition Corp. II (Jun 2026)
- Picton Mahoney Asset Management also filed stake reports on 20 other companies: Blue Water Acquisition Corp. III (Oct 2026), Launch One Acquisition Corp. (Oct 2026), Pono Capital Four, Inc. (Oct 2026)
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Timeline
| Filed | In / out | Person | Role | Effective | Source |
|---|---|---|---|---|---|
| 2026-07-31 | Out | 2026-07-27 | 8-K, 2026-07-31 | ||
| 2026-07-28 | In | Director | 2026-07-22 | 8-K, 2026-07-28 | |
| 2026-05-08 | Out | 2026-07-01 | 8-K, 2026-05-08 | ||
| 2026-04-16 | Reported | not named in the filing | 8-K, 2026-04-16 |
Who leads Terrestrial Energy Inc. /DE/, as last reported?
For each role that changed in the filings below, the most recent change reported. A role that did not change in these filings is not listed.
- Director: Kathryn McCarthy, appointed, effective 2026-07-22 (filed 2026-07-28).
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Find candidates like Director at Terrestrial Energy Inc. /DE/Every change, in the filing's words
Departing: Shawn Matthews, effective 2026-07-27
On July 27, 2026, Shawn Matthews informed Terrestrial Energy Inc. (the "Company") that he was resigning from the Company's Board of Directors (the "Board"), effective July 27, 2026.
- Mr. Matthews' decision to resign from the Board is not the result of any disagreement on any matter relating to the Company's operations, policies or practices.
Appointed: Kathryn McCarthy, Director, effective 2026-07-22
(d) 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.
- Ms. McCarthy has served as Senior Advisor at Oak Ridge National Laboratory since 2025, supporting strategic decisions in the US ITER Project and fusion and fission research and development.
- Previously, she served as Director of the US ITER Project Office at Oak Ridge National Laboratory from 2020 to 2025, where she provided strategic leadership for the US participation in the international ITER fusion energy project.
- Prior to that, she served as Vice President of Research and Development at Canadian Nuclear Laboratories from 2017 to 2020, and held senior leadership positions at Idaho National Laboratory from 2003 to 2017, including Deputy Associate Laboratory Director for Nuclear Science and Technology and Director of Nuclear Science and Engineering.
- Ms. McCarthy will receive compensation consistent pursuant to the Company's non-employee director compensation policy, as described in the Company's definitive proxy statement, filed with the Securities and Exchange Commission on April 29, 2026, in connection with the Company's 2026 Annual Meeting of Stockholders.
Departing: David Hill, effective 2026-07-01
On May 5, 2026, David Hill informed Terrestrial Energy Inc. (the "Company") that he was resigning from the Company's Board of Directors (the "Board"), effective July 1, 2026.
- Mr. Hill joined the Board in 2014 and his decision to resign from the Board is not the result of any disagreement on any matter relating to the Company's operations, policies or practices.
Reported
If Mr. Thrasher's employment is terminated by TEDI for "Cause" (as defined in the Thrasher Employment Agreement"), Mr. Thrasher will be entitled to any salary through the termination date.
- Executive Officer Employment Agreements On April 16, 2026, Terrestrial Energy Inc. (the "Company"), through certain wholly owned subsidiaries, entered into new employment agreements with certain of its executive officers.
- Such new employment agreements replace the prior agreements in place with each officer.
- Brian Thrasher Brian Thrasher, the Company's Chief Financial Officer, entered into an employment agreement with Terrestrial Energy Development, Inc. ("TEDI") on April 16, 2026 (the "Thrasher Employment Agreement").
- If Mr. Thrasher's employment is terminated by Mr. Thrasher, Mr. Thrasher will be entitled to any salary and annual bonus earned and unpaid through the termination date.
- The Thrasher Employment Agreement contains certain restrictive covenants, including non-competition and non-solicitation covenants effective during the Severance Period.
- William Smith William Smith, the Company's Chief Operating Officer, and Terrestrial Energy (Ontario) Inc. ("TEON") entered into an employment agreement on April 16, 2026 (the"Smith Employment Agreement").
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Where this comes from
A public company must file a current report on Form 8-K with the SEC within four business days when a director leaves or is elected, or when its chief executive, chief financial, chief accounting or chief operating officer, or another named executive, departs or is appointed. That disclosure goes under Item 5.02 of the report.
Every change on this page is taken from one of those filings and quoted in the company's own words, with a link to the filing, so it can be checked at the source. Where a filing names the person, the role and the date a change takes effect, they are shown beside the quote. Where it does not, the quote stands on its own. A filing states what changed; it rarely states why, and neither does this page.