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, Q3 2025
Institutional positions in Terrestrial Energy Inc. as of Sep 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
- 66
- +1 vs. Q2 2025
- Shares held
- 9.90M
- −8.89M (−47.3%) vs. Q2 2025
- Total value
- $162.5M
- −$47.1M (−22.5%) vs. Q2 2025
- New holders
- 33
- 14 more added
- Sold out
- 32
- 18 more reduced
Compare with Q2 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, Q3 2025
Shares, value and share of portfolio for each institution holding Terrestrial Energy Inc.; share changes are against Q2 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Wealthspire Advisors, LLC | 20 | $329 | 0.00% | +20 | New |
| Redwood Park Advisors LLC | 44 | $723 | 0.00% | +44 | New |
| Koesten, Hirschmann & Crabtree, INC. | 50 | $821 | 0.00% | +50 | New |
| Larson Financial Group LLC | 104 | $1.71K | 0.00% | +104 | New |
| Steward Partners Investment Advisory, LLC | 200 | $3.28K | 0.00% | +200 | New |
| Advisor Group Holdings, Inc. | 310 | $4.34K | 0.00% | +110+55.0% | Added |
| Group One Trading, L.P. | 576 | $9.45K | 0.00% | +576 | New |
| CoreCap Advisors, LLC | 1,000 | $16.4K | 0.00% | +1,000 | New |
| Anchor Investment Management, LLC | 2,100 | $34.5K | 0.00% | 00.0% | Unchanged |
| Federation des caisses Desjardins du Quebec | 5,250 | $86.2K | 0.00% | +4,050+337.5% | Added |
| Royal Bank of Canada | 7,000 | $115.0K | 0.00% | +7,000 | New |
| North Capital, Inc. | 10,000 | $164.1K | 0.13% | +4,000+66.7% | Added |
| BNP Paribas Arbitrage, SA | 10,000 | $164.1K | 0.00% | +10,000 | New |
| Soltis Investment Advisors LLC | 10,000 | $164.1K | 0.01% | +10,000 | New |
| Raymond James Financial Inc | 10,809 | $177.4K | 0.00% | +10,809 | New |
| Maven Securities LTD | 12,200 | $200.2K | 0.04% | +12,200 | New |
| EHP Funds Inc. | 13,895 | $228.0K | 0.30% | +13,895 | New |
| National Bank of Canada | 16,698 | $274.0K | 0.00% | +4,130+32.9% | Added |
| Tuttle Tactical Management | 17,500 | $287.2K | 1.09% | +2,500+16.7% | Added |
| FNY Investment Advisers, LLC | 18,520 | $303.0K | 0.10% | −22,980−55.4% | Reduced |
| UBS Group AG | 21,889 | $359.2K | 0.00% | +18,241+500.0% | Added |
| Private Advisor Group, LLC | 22,841 | $374.8K | 0.00% | +22,841 | New |
| Nations Financial Group Inc, | 27,047 | $443.8K | 0.03% | +27,047 | New |
| Bank of America Corp | 27,552 | $452.1K | 0.00% | +27,552 | New |
| Alpine Global Management, LLC | 29,300 | $480.8K | 0.10% | +29,300 | New |
| MYDA Advisors LLC | 30,000 | $492.3K | 0.15% | −270,000−90.0% | Reduced |
| Commonwealth Equity Services, LLC | 32,571 | $534.0K | 0.00% | +32,571 | New |
| PEAK6 LLC | 41,389 | $679.2K | 0.02% | −211,972−83.7% | Reduced |
| CastleKnight Management LP | 41,900 | $687.6K | 0.04% | +41,900 | New |
| Picton Mahoney Asset Management | 42,081 | $691.0K | 0.01% | −900,000−95.5% | Reduced |
| Simplex Trading, LLC | 48,514 | $796.0K | 0.02% | +48,514 | New |
| JPMorgan Chase & Co | 52,946 | $868.8K | 0.00% | +3,206+6.4% | Added |
| Boothbay Fund Management, LLC | 58,698 | $963.2K | 0.02% | +58,698 | New |
| Geode Capital Management, LLC | 63,146 | $1.04M | 0.00% | −58,227−48.0% | Reduced |
| Jain Global LLC | 63,363 | $1.04M | 0.01% | +63,363 | New |
| Arosa Capital Management LP | 65,000 | $1.07M | 1.64% | −495,000−88.4% | Reduced |
| Massar Capital Management, LP | 65,000 | $1.07M | 0.38% | −35,000−35.0% | Reduced |
| Morgan Stanley | 71,420 | $1.17M | 0.00% | +451+0.6% | Added |
| Deltec Asset Management LLC | 75,000 | $1.23M | 0.20% | −25,000−25.0% | Reduced |
| Sona Asset Management (US) LLC | 100,000 | $1.64M | 0.06% | +100,000 | New |
| Galaxy Group Investments LLC | 100,000 | $1.64M | 0.16% | +100,000 | New |
| Verition Fund Management LLC | 101,145 | $1.66M | 0.01% | −48,855−32.6% | Reduced |
| HITE Hedge Asset Management LLC | 102,338 | $1.68M | 0.09% | +102,338 | New |
| Wexford Capital LP | 102,712 | $1.69M | 0.51% | +2,712+2.7% | Added |
| BlueCrest Capital Management Ltd | 110,644 | $1.82M | 0.11% | +110,644 | New |
| Whitebox Advisors LLC | 115,000 | $1.89M | 0.04% | −203,914−63.9% | Reduced |
| Jane Street Group, LLC | 127,190 | $2.09M | 0.00% | +127,190 | New |
| Magnetar Financial LLC | 142,304 | $2.34M | 0.01% | −1,254,862−89.8% | Reduced |
| Berkley W R Corp | 160,672 | $2.64M | 0.17% | −237,349−59.6% | Reduced |
| Shay Capital LLC | 162,146 | $2.66M | 0.48% | −386,112−70.4% | Reduced |
| Moore Capital Management, LP | 175,000 | $2.87M | 0.06% | +175,000 | New |
| Waratah Capital Advisors Ltd. | 198,188 | $3.25M | 0.22% | +198,188 | New |
| HRT Financial LP | 204,611 | $3.36M | 0.01% | −25,458−11.1% | Reduced |
| Linden Advisors LP | 209,426 | $3.44M | 0.02% | −1,740,574−89.3% | Reduced |
| SIR Capital Management, L.P. | 217,600 | $3.57M | 0.32% | +217,600 | New |
| Alyeska Investment Group, L.P. | 244,672 | $4.02M | 0.01% | +244,672 | New |
| Sourcerock Group LLC | 257,900 | $4.23M | 0.29% | +257,900 | New |
| Davidson Kempner Capital Management LP | 270,540 | $4.44M | 0.06% | +270,540 | New |
| Cantor Fitzgerald, L. P. | 341,328 | $5.60M | 0.11% | −124,959−26.8% | Reduced |
| Vennlight Capital Management, LP | 500,000 | $8.21M | 10.68% | −527,934−51.4% | Reduced |
| Susquehanna International Group, LLP | 601,931 | $9.88M | 0.01% | +586,785+3,874.2% | Added |
| Millennium Management LLC | 629,363 | $10.3M | 0.01% | +429,363+214.7% | Added |
| LMR Partners LLP | 725,267 | $11.9M | 0.15% | −216,020−22.9% | Reduced |
| Balyasny Asset Management LLC | 864,263 | $14.2M | 0.03% | +319,369+58.6% | Added |
| Citadel Advisors LLC | 1,030,421 | $16.9M | 0.01% | +960,700+1,377.9% | Added |
| D. E. Shaw & Co., Inc. | 1,092,495 | $17.9M | 0.01% | +122,495+12.6% | Added |
| Vivaldi Asset Management, LLC | 0 | $0 | 0.00% | −1,051,124−100.0% | Sold out |
| MMCAP International Inc. SPC | 0 | $0 | 0.00% | −962,068−100.0% | Sold out |
| Calamos Advisors LLC | 0 | $0 | 0.00% | −500,000−100.0% | Sold out |
| DLD Asset Management, LP | 0 | $0 | 0.00% | −468,825−100.0% | Sold out |
| Goldman Sachs Group Inc | 0 | $0 | 0.00% | −435,071−100.0% | Sold out |
| Commonwealth of Pennsylvania Public School Empls Retrmt Sys | 0 | $0 | 0.00% | −405,962−100.0% | Sold out |
| Rivernorth Capital Management, LLC | 0 | $0 | 0.00% | −400,000−100.0% | Sold out |
| Senator Investment Group LP | 0 | $0 | 0.00% | −340,000−100.0% | Sold out |
| Governors Lane LP | 0 | $0 | 0.00% | −300,000−100.0% | Sold out |
| Polar Asset Management Partners Inc. | 0 | $0 | 0.00% | −257,307−100.0% | Sold out |
| Scoggin Management LP | 0 | $0 | 0.00% | −200,000−100.0% | Sold out |
| Westchester Capital Management, LLC | 0 | $0 | 0.00% | −199,691−100.0% | Sold out |
| J. Goldman & Co LP | 0 | $0 | 0.00% | −176,249−100.0% | Sold out |
| Gritstone Asset Management LLC | 0 | $0 | 0.00% | −173,847−100.0% | Sold out |
| Mint Tower Capital Management B.V. | 0 | $0 | 0.00% | −144,903−100.0% | Sold out |
| Tenor Capital Management Co., L.P. | 0 | $0 | 0.00% | −142,960−100.0% | Sold out |
| Bulldog Investors, LLP | 0 | $0 | 0.00% | −113,348−100.0% | Sold out |
| Hidden Lake Asset Management LP | 0 | $0 | 0.00% | −99,370−100.0% | Sold out |
| Periscope Capital Inc. | 0 | $0 | 0.00% | −85,000−100.0% | Sold out |
| Wolverine Asset Management LLC | 0 | $0 | 0.00% | −83,869−100.0% | Sold out |
| Bluefin Capital Management, LLC | 0 | $0 | 0.00% | −74,665−100.0% | Sold out |
| Context Capital Management, LLC | 0 | $0 | 0.00% | −54,800−100.0% | Sold out |
| Shaolin Capital Management LLC | 0 | $0 | 0.00% | −50,000−100.0% | Sold out |
| Fifth Lane Capital, LP | 0 | $0 | 0.00% | −45,000−100.0% | Sold out |
| Yaupon Capital Management LP | 0 | $0 | 0.00% | −35,139−100.0% | Sold out |
| Toronto Dominion Bank | 0 | $0 | 0.00% | −34,485−100.0% | Sold out |
| Virtu Financial LLC | 0 | $0 | 0.00% | −21,838−100.0% | Sold out |
| Patriot Financial Group Insurance Agency, LLC | 0 | $0 | 0.00% | −18,850−100.0% | Sold out |
| Schonfeld Strategic Advisors LLC | 0 | $0 | 0.00% | −11,394−100.0% | Sold out |
| Gordian Capital Singapore Pte Ltd | 0 | $0 | 0.00% | −3,000−100.0% | Sold out |
| Tower Research Capital LLC (TRC) | 0 | $0 | 0.00% | −105−100.0% | Sold out |
| Citigroup Inc | 0 | $0 | 0.00% | −50−100.0% | Sold out |