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 |
|---|---|---|---|---|---|
| D. E. Shaw & Co., Inc. | 1,092,495 | $17.9M | 0.01% | +122,495+12.6% | Added |
| Citadel Advisors LLC | 1,030,421 | $16.9M | 0.01% | +960,700+1,377.9% | Added |
| Balyasny Asset Management LLC | 864,263 | $14.2M | 0.03% | +319,369+58.6% | Added |
| LMR Partners LLP | 725,267 | $11.9M | 0.15% | −216,020−22.9% | Reduced |
| Millennium Management LLC | 629,363 | $10.3M | 0.01% | +429,363+214.7% | Added |
| Susquehanna International Group, LLP | 601,931 | $9.88M | 0.01% | +586,785+3,874.2% | Added |
| Vennlight Capital Management, LP | 500,000 | $8.21M | 10.68% | −527,934−51.4% | Reduced |
| Cantor Fitzgerald, L. P. | 341,328 | $5.60M | 0.11% | −124,959−26.8% | Reduced |
| Davidson Kempner Capital Management LP | 270,540 | $4.44M | 0.06% | +270,540 | New |
| Sourcerock Group LLC | 257,900 | $4.23M | 0.29% | +257,900 | New |
| Alyeska Investment Group, L.P. | 244,672 | $4.02M | 0.01% | +244,672 | New |
| SIR Capital Management, L.P. | 217,600 | $3.57M | 0.32% | +217,600 | New |
| Linden Advisors LP | 209,426 | $3.44M | 0.02% | −1,740,574−89.3% | Reduced |
| HRT Financial LP | 204,611 | $3.36M | 0.01% | −25,458−11.1% | Reduced |
| Waratah Capital Advisors Ltd. | 198,188 | $3.25M | 0.22% | +198,188 | New |
| Moore Capital Management, LP | 175,000 | $2.87M | 0.06% | +175,000 | New |
| Shay Capital LLC | 162,146 | $2.66M | 0.48% | −386,112−70.4% | Reduced |
| Berkley W R Corp | 160,672 | $2.64M | 0.17% | −237,349−59.6% | Reduced |
| Magnetar Financial LLC | 142,304 | $2.34M | 0.01% | −1,254,862−89.8% | Reduced |
| Jane Street Group, LLC | 127,190 | $2.09M | 0.00% | +127,190 | New |
| Whitebox Advisors LLC | 115,000 | $1.89M | 0.04% | −203,914−63.9% | Reduced |
| BlueCrest Capital Management Ltd | 110,644 | $1.82M | 0.11% | +110,644 | New |
| Wexford Capital LP | 102,712 | $1.69M | 0.51% | +2,712+2.7% | Added |
| HITE Hedge Asset Management LLC | 102,338 | $1.68M | 0.09% | +102,338 | New |
| Verition Fund Management LLC | 101,145 | $1.66M | 0.01% | −48,855−32.6% | 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 |
| Deltec Asset Management LLC | 75,000 | $1.23M | 0.20% | −25,000−25.0% | Reduced |
| Morgan Stanley | 71,420 | $1.17M | 0.00% | +451+0.6% | Added |
| 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 |
| Jain Global LLC | 63,363 | $1.04M | 0.01% | +63,363 | New |
| Geode Capital Management, LLC | 63,146 | $1.04M | 0.00% | −58,227−48.0% | Reduced |
| Boothbay Fund Management, LLC | 58,698 | $963.2K | 0.02% | +58,698 | New |
| JPMorgan Chase & Co | 52,946 | $868.8K | 0.00% | +3,206+6.4% | Added |
| Simplex Trading, LLC | 48,514 | $796.0K | 0.02% | +48,514 | New |
| Picton Mahoney Asset Management | 42,081 | $691.0K | 0.01% | −900,000−95.5% | Reduced |
| CastleKnight Management LP | 41,900 | $687.6K | 0.04% | +41,900 | New |
| PEAK6 LLC | 41,389 | $679.2K | 0.02% | −211,972−83.7% | Reduced |
| Commonwealth Equity Services, LLC | 32,571 | $534.0K | 0.00% | +32,571 | New |
| MYDA Advisors LLC | 30,000 | $492.3K | 0.15% | −270,000−90.0% | Reduced |
| Alpine Global Management, LLC | 29,300 | $480.8K | 0.10% | +29,300 | New |
| Bank of America Corp | 27,552 | $452.1K | 0.00% | +27,552 | New |
| Nations Financial Group Inc, | 27,047 | $443.8K | 0.03% | +27,047 | New |
| Private Advisor Group, LLC | 22,841 | $374.8K | 0.00% | +22,841 | New |
| UBS Group AG | 21,889 | $359.2K | 0.00% | +18,241+500.0% | Added |
| FNY Investment Advisers, LLC | 18,520 | $303.0K | 0.10% | −22,980−55.4% | Reduced |
| Tuttle Tactical Management | 17,500 | $287.2K | 1.09% | +2,500+16.7% | Added |
| National Bank of Canada | 16,698 | $274.0K | 0.00% | +4,130+32.9% | Added |
| EHP Funds Inc. | 13,895 | $228.0K | 0.30% | +13,895 | New |
| Maven Securities LTD | 12,200 | $200.2K | 0.04% | +12,200 | New |
| Raymond James Financial Inc | 10,809 | $177.4K | 0.00% | +10,809 | 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 |
| Royal Bank of Canada | 7,000 | $115.0K | 0.00% | +7,000 | New |
| Federation des caisses Desjardins du Quebec | 5,250 | $86.2K | 0.00% | +4,050+337.5% | Added |
| Anchor Investment Management, LLC | 2,100 | $34.5K | 0.00% | 00.0% | Unchanged |
| CoreCap Advisors, LLC | 1,000 | $16.4K | 0.00% | +1,000 | New |
| Group One Trading, L.P. | 576 | $9.45K | 0.00% | +576 | New |
| Advisor Group Holdings, Inc. | 310 | $4.34K | 0.00% | +110+55.0% | Added |
| Steward Partners Investment Advisory, LLC | 200 | $3.28K | 0.00% | +200 | New |
| Larson Financial Group LLC | 104 | $1.71K | 0.00% | +104 | New |
| Koesten, Hirschmann & Crabtree, INC. | 50 | $821 | 0.00% | +50 | New |
| Redwood Park Advisors LLC | 44 | $723 | 0.00% | +44 | New |
| Wealthspire Advisors, LLC | 20 | $329 | 0.00% | +20 | New |
| 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 |