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, Q2 2025
Institutional positions in Terrestrial Energy Inc. as of Jun 30, 2025. 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
- 65
- +21 vs. Q1 2025
- Shares held
- 18.8M
- −1.42M (−7.0%) vs. Q1 2025
- Total value
- $209.6M
- −$3.53M (−1.7%) vs. Q1 2025
- New holders
- 29
- 7 more added
- Sold out
- 8
- 23 more reduced
1 institution that held it in Q1 2025 haven't filed for Q2 2025 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q1 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, Q2 2025
Shares, value and share of portfolio for each institution holding Terrestrial Energy Inc.; share changes are against Q1 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Citigroup Inc | 50 | $555 | 0.00% | +50 | New |
| Tower Research Capital LLC (TRC) | 105 | $1.17K | 0.00% | +105 | New |
| Advisor Group Holdings, Inc. | 200 | $2.22K | 0.00% | +200 | New |
| Federation des caisses Desjardins du Quebec | 1,200 | $13.3K | 0.00% | +1,200 | New |
| Anchor Investment Management, LLC | 2,100 | $23.3K | 0.00% | +2,100 | New |
| Gordian Capital Singapore Pte Ltd | 3,000 | $33.3K | 0.05% | +3,000 | New |
| UBS Group AG | 3,648 | $40.5K | 0.00% | −27,402−88.3% | Reduced |
| North Capital, Inc. | 6,000 | $66.6K | 0.06% | +6,000 | New |
| Schonfeld Strategic Advisors LLC | 11,394 | $126.5K | 0.00% | −33,615−74.7% | Reduced |
| National Bank of Canada | 12,568 | $139.5K | 0.00% | +12,568 | New |
| Tuttle Tactical Management | 15,000 | $166.5K | 0.69% | −20,000−57.1% | Reduced |
| Susquehanna International Group, LLP | 15,146 | $168.1K | 0.00% | −25,145−62.4% | Reduced |
| Patriot Financial Group Insurance Agency, LLC | 18,850 | $209.2K | 0.02% | +18,850 | New |
| Virtu Financial LLC | 21,838 | $242.0K | 0.01% | +8,298+61.3% | Added |
| Toronto Dominion Bank | 34,485 | $382.8K | 0.00% | −40,960−54.3% | Reduced |
| Yaupon Capital Management LP | 35,139 | $390.0K | 0.03% | +35,139 | New |
| FNY Investment Advisers, LLC | 41,500 | $460.0K | 0.20% | +41,400+41,400.0% | Added |
| Fifth Lane Capital, LP | 45,000 | $499.5K | 0.60% | +45,000 | New |
| JPMorgan Chase & Co | 49,740 | $552.1K | 0.00% | +49,740 | New |
| Shaolin Capital Management LLC | 50,000 | $555.0K | 0.02% | +50,000 | New |
| Context Capital Management, LLC | 54,800 | $608.3K | 0.02% | −245,200−81.7% | Reduced |
| Citadel Advisors LLC | 69,721 | $773.9K | 0.00% | +69,721 | New |
| Morgan Stanley | 70,969 | $787.8K | 0.00% | +50,969+254.8% | Added |
| Bluefin Capital Management, LLC | 74,665 | $828.8K | 0.64% | +74,665 | New |
| Wolverine Asset Management LLC | 83,869 | $930.9K | 0.02% | −170,160−67.0% | Reduced |
| Periscope Capital Inc. | 85,000 | $943.5K | 0.36% | −70,000−45.2% | Reduced |
| Hidden Lake Asset Management LP | 99,370 | $1.10M | 0.54% | +99,370 | New |
| Deltec Asset Management LLC | 100,000 | $1.11M | 0.20% | −15,000−13.0% | Reduced |
| Wexford Capital LP | 100,000 | $1.11M | 0.31% | +100,000 | New |
| Massar Capital Management, LP | 100,000 | $1.11M | 0.83% | +100,000 | New |
| Bulldog Investors, LLP | 113,348 | $1.26M | 0.32% | −162,555−58.9% | Reduced |
| Geode Capital Management, LLC | 121,373 | $1.35M | 0.00% | +121,373 | New |
| Tenor Capital Management Co., L.P. | 142,960 | $1.59M | 0.02% | −32,040−18.3% | Reduced |
| Mint Tower Capital Management B.V. | 144,903 | $1.61M | 0.25% | 00.0% | Unchanged |
| Verition Fund Management LLC | 150,000 | $1.67M | 0.01% | −32,612−17.9% | Reduced |
| Gritstone Asset Management LLC | 173,847 | $1.93M | 1.91% | −50,000−22.3% | Reduced |
| J. Goldman & Co LP | 176,249 | $1.96M | 0.06% | +176,249 | New |
| Westchester Capital Management, LLC | 199,691 | $2.22M | 0.13% | −470,790−70.2% | Reduced |
| Millennium Management LLC | 200,000 | $2.22M | 0.00% | 00.0% | Unchanged |
| Scoggin Management LP | 200,000 | $2.22M | 1.03% | +200,000 | New |
| HRT Financial LP | 230,069 | $2.55M | 0.01% | +130,749+131.6% | Added |
| PEAK6 LLC | 253,361 | $2.81M | 0.10% | +253,361 | New |
| Polar Asset Management Partners Inc. | 257,307 | $2.86M | 0.07% | −98,538−27.7% | Reduced |
| MYDA Advisors LLC | 300,000 | $3.33M | 0.93% | +300,000 | New |
| Governors Lane LP | 300,000 | $3.33M | 0.46% | +300,000 | New |
| Whitebox Advisors LLC | 318,914 | $3.54M | 0.10% | −81,086−20.3% | Reduced |
| Senator Investment Group LP | 340,000 | $3.77M | 0.15% | +340,000 | New |
| Berkley W R Corp | 398,021 | $4.42M | 0.27% | +100,781+33.9% | Added |
| Rivernorth Capital Management, LLC | 400,000 | $4.44M | 0.25% | 00.0% | Unchanged |
| Commonwealth of Pennsylvania Public School Empls Retrmt Sys | 405,962 | $4.51M | 0.02% | 00.0% | Unchanged |
| Goldman Sachs Group Inc | 435,071 | $4.83M | 0.00% | −183,701−29.7% | Reduced |
| Cantor Fitzgerald, L. P. | 466,287 | $5.18M | 0.13% | +466,287 | New |
| DLD Asset Management, LP | 468,825 | $5.20M | 0.62% | +239,189+104.2% | Added |
| Calamos Advisors LLC | 500,000 | $5.55M | 0.02% | 00.0% | Unchanged |
| Balyasny Asset Management LLC | 544,894 | $6.05M | 0.01% | +479,894+738.3% | Added |
| Shay Capital LLC | 548,258 | $6.09M | 1.39% | +548,258 | New |
| Arosa Capital Management LP | 560,000 | $6.22M | 4.54% | +560,000 | New |
| LMR Partners LLP | 941,287 | $10.4M | 0.16% | −470,402−33.3% | Reduced |
| Picton Mahoney Asset Management | 942,081 | $10.5M | 0.15% | −837,919−47.1% | Reduced |
| MMCAP International Inc. SPC | 962,068 | $10.7M | 1.28% | −17,932−1.8% | Reduced |
| D. E. Shaw & Co., Inc. | 970,000 | $10.8M | 0.01% | 00.0% | Unchanged |
| Vennlight Capital Management, LP | 1,027,934 | $11.4M | 12.52% | +1,027,934 | New |
| Vivaldi Asset Management, LLC | 1,051,124 | $11.7M | 0.79% | −677,828−39.2% | Reduced |
| Magnetar Financial LLC | 1,397,166 | $16.5M | 0.08% | −562,032−28.7% | Reduced |
| Linden Advisors LP | 1,950,000 | $21.6M | 0.13% | −50,000−2.5% | Reduced |
| CNH Partners LLC | 0 | $0 | 0.00% | −1,288,674−100.0% | Sold out |
| Encompass Capital Advisors LLC | 0 | $0 | 0.00% | −946,165−100.0% | Sold out |
| Two Sigma Investments, LP | 0 | $0 | 0.00% | −500,000−100.0% | Sold out |
| Athos Capital Ltd | 0 | $0 | 0.00% | −200,000−100.0% | Sold out |
| Decagon Asset Management LLP | 0 | $0 | 0.00% | −56,178−100.0% | Sold out |
| Glazer Capital, LLC | 0 | $0 | 0.00% | −36,831−100.0% | Sold out |
| PenderFund Capital Management Ltd. | 0 | $0 | 0.00% | −30,000−100.0% | Sold out |
| Clear Street LLC | 0 | $0 | 0.00% | −165−100.0% | Sold out |
| Mizuho Securities USA LLC | – | – | – | – | Not filed |