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