Major IMSR holder Roberto Sella updates stock and warrant holdings
Rhea-AI Filing Summary
Terrestrial Energy Inc. (IMSR) 10% owner Roberto Marco Sella has filed an amended Form 3 to update how his existing stakes are described, without reporting any new purchases or sales. The filing lists holdings of common stock and warrants as of October 29, 2025, including both direct and indirect positions.
Directly, he reports 180,316 shares of common stock and 539,117 warrants to purchase common stock. Indirectly, he reports 12,244,088 shares of common stock and multiple warrant positions held through joint ownership with his spouse, a 2012 family trust where he serves as trustee, and the LL Charitable Foundation where he is president. The amendment states it is made solely to correct footnote designations in the warrant table, indicating the change is administrative rather than economic.
Positive
- None.
Negative
- None.
Insider Trade Summary
| Type | Security | Shares | Price | Value |
|---|---|---|---|---|
| holding | Warrants to purchase shares of Common Stock | -- | -- | -- |
| holding | Warrants to purchase shares of Common Stock | -- | -- | -- |
| holding | Warrants to purchase shares of Common Stock | -- | -- | -- |
| holding | Warrants to purchase shares of Common Stock | -- | -- | -- |
| holding | Common Stock | -- | -- | -- |
| holding | Common Stock | -- | -- | -- |
| holding | Common Stock | -- | -- | -- |
| holding | Common Stock | -- | -- | -- |
Footnotes (1)
- Upon closing of the business combination (the "Business Combination") between Terrestrial Energy Inc., a Delaware corporation formerly known as HCM II Acquisition Corp. ("New Terrestrial"), and Terrestrial Energy Development Inc., a Delaware corporation formerly known as Terrestrial Energy Inc. ("Legacy Terrestrial"), the reporting persons acquired these securities in exchange for the reporting person's securities in Legacy Terrestrial pursuant to the terms and conditions of the Business Combination Agreement, dated as of March 26, 2025, by and among HCM II Acquisition Corp., HCM II Merger Sub Inc. and Legacy Terrestrial. Represents securities jointly held by the reporting person and the reporting person's spouse. The reporting person disclaims beneficial ownership of the securities held jointly with his spouse except to the extent of his pecuniary interest therein Represents securities held by Roberto M. Sella 2012 Family Trust (the "Trust"), of which the reporting person is the trustee. The reporting person may be deemed to have voting and dispositive power over the shares held by the Trust. The reporting person disclaims beneficial ownership of the securities held by the Trust except to the extent of his pecuniary interest therein. Represents securities held by LL Charitable Foundation (the "Foundation"), of which the reporting person is the president. The reporting person may be deemed to have voting and dispositive power over the shares held by the Foundation. The reporting person disclaims beneficial ownership of the securities held by the Foundation except to the extent of his pecuniary interest therein. Amendment made solely to correct the footnote designations in Table II, Item 6.
