Terrestrial Energy Inc.
IMSR- Exchange
- Nasdaq
- Industry
- Fabricated Plate Work (Boiler Shops)
- SEC CIK
- 0002019804
No open-market purchases or sales by Terrestrial Energy Inc. insiders were filed in the last 90 days; 110 institutions reported holding it in 13F filings for Q2 2026, worth $151.3M in total; no superinvestor holds it.
Other share classesIMSRW
13F holders, Q1 2026
Institutional positions in Terrestrial Energy Inc. as of Mar 31, 2026. Investment managers with $100 million or more in US stocks report their long positions on Form 13F within 45 days after each quarter ends. How 13F works
- Institutional holders
- 88
- +8 vs. Q4 2025
- Shares held
- 18.6M
- −425.1K (−2.2%) vs. Q4 2025
- Total value
- $111.3M
- −$5.05M (−4.3%) vs. Q4 2025
- New holders
- 35
- 19 more added
- Sold out
- 27
- 22 more reduced
2 institutions that held it in Q4 2025 haven't filed for Q1 2026 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q4 2025: new holders, sold out and not filed yet
Holders and value by quarter
Institutions reporting IMSR on Form 13F each quarter since Q1 2021, and the total value they reported. Values are as of each quarter end, so they also move with the share price.
| Quarter | Holders | Value |
|---|---|---|
| Q2 2026 | 110 | $151.3M |
| Q1 2026 | 88 | $111.3M |
| Q4 2025 | 82 | $130.7M |
| Q3 2025 | 66 | $162.5M |
| Q2 2025 | 65 | $209.6M |
| Q1 2025 | 45 | $213.4M |
| Q4 2024 | 35 | $162.3M |
| Q3 2024 | 0 | $0 |
| Q2 2024 | 0 | $0 |
| Q1 2024 | 0 | $0 |
| Q4 2023 | 0 | $0 |
| Q3 2023 | 0 | $0 |
| Q2 2023 | 0 | $0 |
| Q1 2023 | 0 | $0 |
| Q4 2022 | 0 | $0 |
| Q3 2022 | 0 | $0 |
| Q2 2022 | 0 | $0 |
| Q1 2022 | 0 | $0 |
| Q4 2021 | 0 | $0 |
| Q3 2021 | 0 | $0 |
| Q2 2021 | 0 | $0 |
| Q1 2021 | 0 | $0 |
Institutions, Q1 2026
Shares, value and share of portfolio for each institution holding Terrestrial Energy Inc.; share changes are against Q4 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Barclays PLC | 0 | $0 | 0.00% | −45,275−100.0% | Sold out |
| Millennium Management LLC | 0 | $0 | 0.00% | −31,658−100.0% | Sold out |
| Lighthouse Investment Partners, LLC | 0 | $0 | 0.00% | −26,340−100.0% | Sold out |
| Virtu Financial LLC | 0 | $0 | 0.00% | −21,688−100.0% | Sold out |
| Landscape Capital Management, L.L.C. | 0 | $0 | 0.00% | −17,121−100.0% | Sold out |
| Alpine Global Management, LLC | 0 | $0 | 0.00% | −16,252−100.0% | Sold out |
| Marex Group plc | 0 | $0 | 0.00% | −12,000−100.0% | Sold out |
| Clear Street Markets LLC | 0 | $0 | 0.00% | −11,500−100.0% | Sold out |
| Grantham, Mayo, Van Otterloo & Co. LLC | 0 | $0 | 0.00% | −11,475−100.0% | Sold out |
| Aster Capital Management (DIFC) Ltd | 0 | $0 | 0.00% | −1,340−100.0% | Sold out |
| Tucker Asset Management LLC | 0 | $0 | 0.00% | −371−100.0% | Sold out |
| Davidson Capital Management Inc. | 0 | $0 | 0.00% | −182−100.0% | Sold out |
| Flagship Harbor Advisors, LLC | 0 | $0 | 0.00% | −140−100.0% | Sold out |
| FMR LLC | 0 | $0 | 0.00% | −100−100.0% | Sold out |
| Triumph Capital Management | 0 | $0 | 0.00% | −45−100.0% | Sold out |
| Vanguard Group Inc | – | – | – | – | Not filed |
| Galaxy Group Investments LLC | – | – | – | – | Not filed |