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, Q4 2025
Institutional positions in Terrestrial Energy Inc. as of Dec 31, 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
- 82
- +16 vs. Q3 2025
- Shares held
- 21.4M
- +11.5M (+116.3%) vs. Q3 2025
- Total value
- $130.7M
- −$31.8M (−19.6%) vs. Q3 2025
- New holders
- 50
- 19 more added
- Sold out
- 34
- 9 more reduced
Compare with Q3 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, Q4 2025
Shares, value and share of portfolio for each institution holding Terrestrial Energy Inc.; share changes are against Q3 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| CoreCap Advisors, LLC | 7 | $43 | 0.00% | −993−99.3% | Reduced |
| Triumph Capital Management | 45 | $275 | 0.00% | +45 | New |
| Root Financial Partners, LLC | 50 | $306 | 0.00% | +50 | New |
| DB Fitzpatrick & Co, Inc | 70 | $428 | 0.00% | +70 | New |
| FMR LLC | 100 | $611 | 0.00% | +100 | New |
| Flagship Harbor Advisors, LLC | 140 | $855 | 0.00% | +140 | New |
| Davidson Capital Management Inc. | 182 | $1.11K | 0.00% | +182 | New |
| Steward Partners Investment Advisory, LLC | 200 | $1.22K | 0.00% | 00.0% | Unchanged |
| Farther Finance Advisors, LLC | 248 | $1.51K | 0.00% | +248 | New |
| Tucker Asset Management LLC | 371 | $2.27K | 0.00% | +371 | New |
| Cherry Tree Wealth Management, LLC | 692 | $4.23K | 0.00% | +692 | New |
| Aster Capital Management (DIFC) Ltd | 1,340 | $8.19K | 0.00% | +1,340 | New |
| Tower Research Capital LLC (TRC) | 1,680 | $10.3K | 0.00% | +1,680 | New |
| Anchor Investment Management, LLC | 2,100 | $12.8K | 0.00% | 00.0% | Unchanged |
| Advisor Group Holdings, Inc. | 2,431 | $14.9K | 0.00% | +2,121+684.2% | Added |
| Federation des caisses Desjardins du Quebec | 4,350 | $26.6K | 0.00% | −900−17.1% | Reduced |
| Grantham, Mayo, Van Otterloo & Co. LLC | 11,475 | $70.1K | 0.00% | +11,475 | New |
| Clear Street Markets LLC | 11,500 | $70.3K | 0.01% | +11,500 | New |
| Marex Group plc | 12,000 | $73.3K | 0.00% | +12,000 | New |
| Citigroup Inc | 12,319 | $75.3K | 0.00% | +12,319 | New |
| Alpine Global Management, LLC | 16,252 | $99.3K | 0.02% | −13,048−44.5% | Reduced |
| National Bank of Canada | 17,000 | $103.7K | 0.00% | +302+1.8% | Added |
| Landscape Capital Management, L.L.C. | 17,121 | $104.6K | 0.01% | +17,121 | New |
| Schonfeld Strategic Advisors LLC | 17,828 | $108.9K | 0.00% | +17,828 | New |
| Virtu Financial LLC | 21,688 | $133.0K | 0.01% | +21,688 | New |
| Magnetar Financial LLC | 24,885 | $152.0K | 0.00% | −117,419−82.5% | Reduced |
| Toronto Dominion Bank | 25,000 | $152.8K | 0.00% | +25,000 | New |
| Lighthouse Investment Partners, LLC | 26,340 | $160.9K | 0.01% | +26,340 | New |
| Brevan Howard Capital Management LP | 26,400 | $161.3K | 0.00% | +26,400 | New |
| T3 Companies, LLC | 28,500 | $174.1K | 0.22% | +28,500 | New |
| Marshall Wace, LLP | 30,893 | $188.8K | 0.00% | +30,893 | New |
| Millennium Management LLC | 31,658 | $193.4K | 0.00% | −597,705−95.0% | Reduced |
| Royal Bank of Canada | 32,992 | $202.0K | 0.00% | +25,992+371.3% | Added |
| Mount Lucas Management LP | 40,000 | $244.4K | 0.11% | +40,000 | New |
| Simon Quick Advisors, LLC | 45,000 | $274.9K | 0.01% | +45,000 | New |
| Barclays PLC | 45,275 | $276.6K | 0.00% | +45,275 | New |
| Moore Capital Management, LP | 50,000 | $305.5K | 0.01% | −125,000−71.4% | Reduced |
| Engineers Gate Manager LP | 51,654 | $315.6K | 0.00% | +51,654 | New |
| Commonwealth Equity Services, LLC | 54,023 | $330.1K | 0.00% | +21,452+65.9% | Added |
| Two Sigma Investments, LP | 57,712 | $352.6K | 0.00% | +57,712 | New |
| CastleKnight Management LP | 60,700 | $370.9K | 0.02% | +18,800+44.9% | Added |
| Massar Capital Management, LP | 65,000 | $397.1K | 0.08% | 00.0% | Unchanged |
| Bank of America Corp | 67,729 | $413.8K | 0.00% | +40,177+145.8% | Added |
| Tiemann Investment Advisors, LLC | 75,995 | $464.3K | 0.18% | +75,995 | New |
| Jump Financial, LLC | 77,900 | $476.0K | 0.01% | +77,900 | New |
| SkyView Investment Advisors, LLC | 83,844 | $512.0K | 0.06% | +83,844 | New |
| Squarepoint Ops LLC | 89,207 | $545.1K | 0.00% | +89,207 | New |
| FNY Investment Advisers, LLC | 90,000 | $549.0K | 0.16% | +71,480+386.0% | Added |
| Periscope Capital Inc. | 122,000 | $580.7K | 0.11% | +122,000 | New |
| XTX Topco Ltd | 97,218 | $594.0K | 0.02% | +97,218 | New |
| Sona Asset Management (US) LLC | 100,000 | $611.0K | 0.02% | 00.0% | Unchanged |
| Harraden Circle Investments, LLC | 122,000 | $745.4K | 0.14% | +122,000 | New |
| Morgan Stanley | 122,307 | $747.3K | 0.00% | +50,887+71.3% | Added |
| Northern Trust Corp | 156,377 | $955.5K | 0.00% | +156,377 | New |
| Renaissance Technologies LLC | 172,800 | $1.06M | 0.00% | +172,800 | New |
| Walleye Capital LLC | 210,581 | $1.29M | 0.01% | +210,581 | New |
| Danske Bank A/S | 213,401 | $1.30M | 0.00% | +213,401 | New |
| Highbridge Capital Management LLC | 244,000 | $1.49M | 0.07% | +244,000 | New |
| Shay Capital LLC | 277,363 | $1.69M | 0.27% | +115,217+71.1% | Added |
| Goldman Sachs Group Inc | 281,764 | $1.72M | 0.00% | +281,764 | New |
| Jane Street Group, LLC | 301,213 | $1.84M | 0.00% | +174,023+136.8% | Added |
| State Street Corp | 326,700 | $2.00M | 0.00% | +326,700 | New |
| Susquehanna International Group, LLP | 348,532 | $2.13M | 0.00% | −253,399−42.1% | Reduced |
| Charles Schwab Investment Management Inc | 410,877 | $2.51M | 0.00% | +410,877 | New |
| Galaxy Group Investments LLC | 500,000 | $3.06M | 0.42% | +400,000+400.0% | Added |
| HBK Investments L P | 500,000 | $3.06M | 0.03% | +500,000 | New |
| UBS Group AG | 512,644 | $3.13M | 0.00% | +490,755+2,242.0% | Added |
| Cantor Fitzgerald, L. P. | 550,000 | $3.36M | 0.10% | +208,672+61.1% | Added |
| LMR Partners LLP | 588,214 | $3.59M | 0.03% | −137,053−18.9% | Reduced |
| Winton Group Ltd | 646,190 | $3.95M | 0.14% | +646,190 | New |
| Alyeska Investment Group, L.P. | 722,000 | $4.38M | 0.01% | +477,328+195.1% | Added |
| Hudson Bay Capital Management LP | 736,038 | $4.50M | 0.03% | +736,038 | New |
| MMCAP International Inc. SPC | 750,000 | $4.58M | 0.46% | +750,000 | New |
| Verition Fund Management LLC | 753,803 | $4.61M | 0.02% | +652,658+645.3% | Added |
| Geode Capital Management, LLC | 796,327 | $4.87M | 0.00% | +733,181+1,161.1% | Added |
| Senator Investment Group LP | 900,000 | $5.50M | 0.22% | +900,000 | New |
| D. E. Shaw & Co., Inc. | 1,079,546 | $6.60M | 0.01% | −12,949−1.2% | Reduced |
| BlackRock, Inc. | 1,092,501 | $6.68M | 0.00% | +1,092,501 | New |
| JPMorgan Chase & Co | 1,170,087 | $7.15M | 0.00% | +1,117,141+2,110.0% | Added |
| Balyasny Asset Management LLC | 1,400,953 | $8.56M | 0.02% | +536,690+62.1% | Added |
| Vanguard Group Inc | 1,849,446 | $11.3M | 0.00% | +1,849,446 | New |
| Citadel Advisors LLC | 2,029,208 | $12.4M | 0.01% | +998,787+96.9% | Added |
| Vennlight Capital Management, LP | 0 | $0 | 0.00% | −500,000−100.0% | Sold out |
| Davidson Kempner Capital Management LP | 0 | $0 | 0.00% | −270,540−100.0% | Sold out |
| Sourcerock Group LLC | 0 | $0 | 0.00% | −257,900−100.0% | Sold out |
| SIR Capital Management, L.P. | 0 | $0 | 0.00% | −217,600−100.0% | Sold out |
| Linden Advisors LP | 0 | $0 | 0.00% | −209,426−100.0% | Sold out |
| HRT Financial LP | 0 | $0 | 0.00% | −204,611−100.0% | Sold out |
| Waratah Capital Advisors Ltd. | 0 | $0 | 0.00% | −198,188−100.0% | Sold out |
| Berkley W R Corp | 0 | $0 | 0.00% | −160,672−100.0% | Sold out |
| Whitebox Advisors LLC | 0 | $0 | 0.00% | −115,000−100.0% | Sold out |
| BlueCrest Capital Management Ltd | 0 | $0 | 0.00% | −110,644−100.0% | Sold out |
| Wexford Capital LP | 0 | $0 | 0.00% | −102,712−100.0% | Sold out |
| HITE Hedge Asset Management LLC | 0 | $0 | 0.00% | −102,338−100.0% | Sold out |
| Deltec Asset Management LLC | 0 | $0 | 0.00% | −75,000−100.0% | Sold out |
| Arosa Capital Management LP | 0 | $0 | 0.00% | −65,000−100.0% | Sold out |
| Jain Global LLC | 0 | $0 | 0.00% | −63,363−100.0% | Sold out |
| Boothbay Fund Management, LLC | 0 | $0 | 0.00% | −58,698−100.0% | Sold out |
| Simplex Trading, LLC | 0 | $0 | 0.00% | −48,514−100.0% | Sold out |
| Picton Mahoney Asset Management | 0 | $0 | 0.00% | −42,081−100.0% | Sold out |