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 |
|---|---|---|---|---|---|
| Linden Advisors LP | 1,950,000 | $21.6M | 0.13% | −50,000−2.5% | Reduced |
| Magnetar Financial LLC | 1,397,166 | $16.5M | 0.08% | −562,032−28.7% | Reduced |
| Vivaldi Asset Management, LLC | 1,051,124 | $11.7M | 0.79% | −677,828−39.2% | Reduced |
| Vennlight Capital Management, LP | 1,027,934 | $11.4M | 12.52% | +1,027,934 | New |
| D. E. Shaw & Co., Inc. | 970,000 | $10.8M | 0.01% | 00.0% | Unchanged |
| MMCAP International Inc. SPC | 962,068 | $10.7M | 1.28% | −17,932−1.8% | Reduced |
| Picton Mahoney Asset Management | 942,081 | $10.5M | 0.15% | −837,919−47.1% | Reduced |
| LMR Partners LLP | 941,287 | $10.4M | 0.16% | −470,402−33.3% | Reduced |
| Arosa Capital Management LP | 560,000 | $6.22M | 4.54% | +560,000 | New |
| Shay Capital LLC | 548,258 | $6.09M | 1.39% | +548,258 | New |
| Balyasny Asset Management LLC | 544,894 | $6.05M | 0.01% | +479,894+738.3% | Added |
| Calamos Advisors LLC | 500,000 | $5.55M | 0.02% | 00.0% | Unchanged |
| DLD Asset Management, LP | 468,825 | $5.20M | 0.62% | +239,189+104.2% | Added |
| Cantor Fitzgerald, L. P. | 466,287 | $5.18M | 0.13% | +466,287 | New |
| Goldman Sachs Group Inc | 435,071 | $4.83M | 0.00% | −183,701−29.7% | Reduced |
| Commonwealth of Pennsylvania Public School Empls Retrmt Sys | 405,962 | $4.51M | 0.02% | 00.0% | Unchanged |
| Rivernorth Capital Management, LLC | 400,000 | $4.44M | 0.25% | 00.0% | Unchanged |
| Berkley W R Corp | 398,021 | $4.42M | 0.27% | +100,781+33.9% | Added |
| Senator Investment Group LP | 340,000 | $3.77M | 0.15% | +340,000 | New |
| Whitebox Advisors LLC | 318,914 | $3.54M | 0.10% | −81,086−20.3% | 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 |
| Polar Asset Management Partners Inc. | 257,307 | $2.86M | 0.07% | −98,538−27.7% | Reduced |
| PEAK6 LLC | 253,361 | $2.81M | 0.10% | +253,361 | New |
| HRT Financial LP | 230,069 | $2.55M | 0.01% | +130,749+131.6% | Added |
| Millennium Management LLC | 200,000 | $2.22M | 0.00% | 00.0% | Unchanged |
| Scoggin Management LP | 200,000 | $2.22M | 1.03% | +200,000 | New |
| Westchester Capital Management, LLC | 199,691 | $2.22M | 0.13% | −470,790−70.2% | Reduced |
| J. Goldman & Co LP | 176,249 | $1.96M | 0.06% | +176,249 | New |
| Gritstone Asset Management LLC | 173,847 | $1.93M | 1.91% | −50,000−22.3% | Reduced |
| Verition Fund Management LLC | 150,000 | $1.67M | 0.01% | −32,612−17.9% | Reduced |
| Mint Tower Capital Management B.V. | 144,903 | $1.61M | 0.25% | 00.0% | Unchanged |
| Tenor Capital Management Co., L.P. | 142,960 | $1.59M | 0.02% | −32,040−18.3% | Reduced |
| Geode Capital Management, LLC | 121,373 | $1.35M | 0.00% | +121,373 | New |
| Bulldog Investors, LLP | 113,348 | $1.26M | 0.32% | −162,555−58.9% | Reduced |
| 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 |
| Hidden Lake Asset Management LP | 99,370 | $1.10M | 0.54% | +99,370 | New |
| Periscope Capital Inc. | 85,000 | $943.5K | 0.36% | −70,000−45.2% | Reduced |
| Wolverine Asset Management LLC | 83,869 | $930.9K | 0.02% | −170,160−67.0% | Reduced |
| Bluefin Capital Management, LLC | 74,665 | $828.8K | 0.64% | +74,665 | New |
| Morgan Stanley | 70,969 | $787.8K | 0.00% | +50,969+254.8% | Added |
| Citadel Advisors LLC | 69,721 | $773.9K | 0.00% | +69,721 | New |
| Context Capital Management, LLC | 54,800 | $608.3K | 0.02% | −245,200−81.7% | Reduced |
| Shaolin Capital Management LLC | 50,000 | $555.0K | 0.02% | +50,000 | New |
| JPMorgan Chase & Co | 49,740 | $552.1K | 0.00% | +49,740 | New |
| Fifth Lane Capital, LP | 45,000 | $499.5K | 0.60% | +45,000 | New |
| FNY Investment Advisers, LLC | 41,500 | $460.0K | 0.20% | +41,400+41,400.0% | Added |
| Yaupon Capital Management LP | 35,139 | $390.0K | 0.03% | +35,139 | New |
| Toronto Dominion Bank | 34,485 | $382.8K | 0.00% | −40,960−54.3% | Reduced |
| Virtu Financial LLC | 21,838 | $242.0K | 0.01% | +8,298+61.3% | Added |
| Patriot Financial Group Insurance Agency, LLC | 18,850 | $209.2K | 0.02% | +18,850 | New |
| Susquehanna International Group, LLP | 15,146 | $168.1K | 0.00% | −25,145−62.4% | Reduced |
| Tuttle Tactical Management | 15,000 | $166.5K | 0.69% | −20,000−57.1% | Reduced |
| National Bank of Canada | 12,568 | $139.5K | 0.00% | +12,568 | New |
| Schonfeld Strategic Advisors LLC | 11,394 | $126.5K | 0.00% | −33,615−74.7% | Reduced |
| North Capital, Inc. | 6,000 | $66.6K | 0.06% | +6,000 | New |
| UBS Group AG | 3,648 | $40.5K | 0.00% | −27,402−88.3% | Reduced |
| Gordian Capital Singapore Pte Ltd | 3,000 | $33.3K | 0.05% | +3,000 | New |
| Anchor Investment Management, LLC | 2,100 | $23.3K | 0.00% | +2,100 | New |
| Federation des caisses Desjardins du Quebec | 1,200 | $13.3K | 0.00% | +1,200 | New |
| Advisor Group Holdings, Inc. | 200 | $2.22K | 0.00% | +200 | New |
| Tower Research Capital LLC (TRC) | 105 | $1.17K | 0.00% | +105 | New |
| Citigroup Inc | 50 | $555 | 0.00% | +50 | New |
| 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 |