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, Q1 2026
Institutional positions in Terrestrial Energy Inc. as of Mar 31, 2026. 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
- 88
- +8 vs. Q4 2025
- Shares held
- 18.6M
- −425.1K (−2.2%) vs. Q4 2025
- Total value
- $111.3M
- −$5.05M (−4.3%) vs. Q4 2025
- New holders
- 35
- 19 more added
- Sold out
- 27
- 22 more reduced
2 institutions that held it in Q4 2025 haven't filed for Q1 2026 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q4 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, Q1 2026
Shares, value and share of portfolio for each institution holding Terrestrial Energy Inc.; share changes are against Q4 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Exchange Traded Concepts, LLC | 2,091,161 | $12.6M | 0.10% | +2,091,161 | New |
| Vanguard Capital Management LLC | 1,303,452 | $7.83M | 0.00% | +1,303,452 | New |
| Citadel Advisors LLC | 1,277,258 | $7.67M | 0.01% | −751,950−37.1% | Reduced |
| D. E. Shaw & Co., Inc. | 1,214,777 | $7.29M | 0.01% | +135,231+12.5% | Added |
| BlackRock, Inc. | 1,120,885 | $6.73M | 0.00% | +28,384+2.6% | Added |
| JPMorgan Chase & Co | 1,073,073 | $5.93M | 0.00% | −97,014−8.3% | Reduced |
| Alyeska Investment Group, L.P. | 722,000 | $4.31M | 0.01% | 00.0% | Unchanged |
| LMR Partners LLP | 690,702 | $4.15M | 0.04% | +102,488+17.4% | Added |
| Geode Capital Management, LLC | 659,388 | $3.96M | 0.00% | −136,939−17.2% | Reduced |
| Vennlight Capital Management, LP | 575,499 | $3.46M | 3.49% | +575,499 | New |
| Winton Group Ltd | 496,300 | $2.98M | 0.10% | −149,890−23.2% | Reduced |
| UBS Group AG | 493,577 | $2.96M | 0.00% | −19,067−3.7% | Reduced |
| Hudson Bay Capital Management LP | 452,287 | $2.72M | 0.02% | −283,751−38.6% | Reduced |
| Verition Fund Management LLC | 444,958 | $2.67M | 0.03% | −308,845−41.0% | Reduced |
| Renaissance Technologies LLC | 407,900 | $2.45M | 0.00% | +235,100+136.1% | Added |
| Goldman Sachs Group Inc | 396,238 | $2.38M | 0.00% | +114,474+40.6% | Added |
| State Street Corp | 345,520 | $2.07M | 0.00% | +18,820+5.8% | Added |
| Charles Schwab Investment Management Inc | 337,991 | $2.03M | 0.00% | −72,886−17.7% | Reduced |
| Susquehanna International Group, LLP | 330,276 | $1.98M | 0.00% | −18,256−5.2% | Reduced |
| Creek Drive Management Group LLC | 330,000 | $1.98M | 1.24% | +330,000 | New |
| Vanguard Fiduciary Trust Co | 300,407 | $1.80M | 0.00% | +300,407 | New |
| Morgan Stanley | 285,549 | $1.71M | 0.00% | +163,242+133.5% | Added |
| Magnetar Financial LLC | 244,000 | $1.47M | 0.01% | +219,115+880.5% | Added |
| HITE Hedge Asset Management LLC | 240,113 | $1.44M | 0.08% | +240,113 | New |
| Toronto Dominion Bank | 225,974 | $1.36M | 0.00% | +200,974+803.9% | Added |
| Balyasny Asset Management LLC | 205,903 | $1.24M | 0.00% | −1,195,050−85.3% | Reduced |
| Squarepoint Ops LLC | 173,209 | $1.04M | 0.00% | +84,002+94.2% | Added |
| Bank of America Corp | 132,750 | $797.2K | 0.00% | +65,021+96.0% | Added |
| Northern Trust Corp | 124,537 | $747.8K | 0.00% | −31,840−20.4% | Reduced |
| Harraden Circle Investments, LLC | 122,000 | $732.6K | 0.15% | 00.0% | Unchanged |
| Yorkville Advisors Global, LP | 122,000 | $732.6K | 0.50% | +122,000 | New |
| Shay Capital LLC | 118,086 | $709.1K | 0.10% | −159,277−57.4% | Reduced |
| Commonwealth Equity Services, LLC | 100,131 | $601.3K | 0.00% | +46,108+85.3% | Added |
| Periscope Capital Inc. | 122,000 | $579.5K | 0.10% | 00.0% | Unchanged |
| Sona Asset Management (US) LLC | 85,566 | $513.8K | 0.02% | −14,434−14.4% | Reduced |
| K2 Principal Fund, L.P. | 80,000 | $480.8K | 0.05% | +80,000 | New |
| Tiemann Investment Advisors, LLC | 75,995 | $456.4K | 0.18% | 00.0% | Unchanged |
| Moore Capital Management, LP | 75,000 | $450.4K | 0.02% | +25,000+50.0% | Added |
| FNY Investment Advisers, LLC | 66,160 | $397.0K | 0.18% | −23,840−26.5% | Reduced |
| Massar Capital Management, LP | 65,000 | $390.3K | 0.08% | 00.0% | Unchanged |
| UBS Asset Management Americas Inc | 63,500 | $381.3K | 0.00% | +63,500 | New |
| CastleKnight Management LP | 60,700 | $364.5K | 0.02% | 00.0% | Unchanged |
| Diametric Capital, LP | 59,191 | $355.4K | 0.09% | +59,191 | New |
| Swiss National Bank | 56,600 | $339.9K | 0.00% | +56,600 | New |
| Mount Lucas Management LP | 51,500 | $309.3K | 0.11% | +11,500+28.7% | Added |
| MMCAP International Inc. SPC | 44,279 | $265.9K | 0.02% | −705,721−94.1% | Reduced |
| Simon Quick Advisors, LLC | 40,000 | $240.2K | 0.01% | −5,000−11.1% | Reduced |
| Bluefin Capital Management, LLC | 32,463 | $194.9K | 0.19% | +32,463 | New |
| California State Teachers Retirement System | 31,276 | $187.8K | 0.00% | +31,276 | New |
| Vanguard Global Advisers, LLC | 27,055 | $162.5K | 0.00% | +27,055 | New |
| Citigroup Inc | 26,908 | $161.6K | 0.00% | +14,589+118.4% | Added |
| LPL Financial LLC | 26,704 | $160.4K | 0.00% | +26,704 | New |
| Marshall Wace, LLP | 26,277 | $157.7K | 0.00% | −4,616−14.9% | Reduced |
| Royal Bank of Canada | 25,621 | $154.0K | 0.00% | −7,371−22.3% | Reduced |
| Brevan Howard Capital Management LP | 25,153 | $151.0K | 0.00% | −1,247−4.7% | Reduced |
| DRW Securities, LLC | 22,000 | $132.1K | 0.01% | +22,000 | New |
| Flow Traders U.S. LLC | 21,530 | $129.0K | 0.00% | +21,530 | New |
| IMC-Chicago, LLC | 21,157 | $127.0K | 0.00% | +21,157 | New |
| Advisory Services Network, LLC | 20,935 | $125.7K | 0.00% | +20,935 | New |
| Vanguard Asset Management, Ltd | 19,453 | $116.8K | 0.00% | +19,453 | New |
| Schonfeld Strategic Advisors LLC | 19,254 | $115.6K | 0.00% | +1,426+8.0% | Added |
| Bank of New York Mellon Corp | 17,035 | $102.3K | 0.00% | +17,035 | New |
| Level Four Advisory Services, LLC | 16,375 | $98.3K | 0.00% | +16,375 | New |
| T3 Companies, LLC | 16,295 | $97.9K | 0.13% | −12,205−42.8% | Reduced |
| Flax Pond Capital, LLC | 16,000 | $96.1K | 0.08% | +16,000 | New |
| Legal & General Group Plc | 15,229 | $91.5K | 0.00% | +15,229 | New |
| Prelude Capital Management, LLC | 12,619 | $75.8K | 0.01% | +12,619 | New |
| Bank of Montreal | 12,520 | $75.2K | 0.00% | +12,520 | New |
| Tudor Investment Corp Et Al | 11,254 | $67.6K | 0.00% | +11,254 | New |
| Vanguard Investments Australia, Ltd. | 10,674 | $64.1K | 0.00% | +10,674 | New |
| WealthPlan Investment Management, LLC | 10,206 | $61.3K | 0.00% | +10,206 | New |
| First Foundation Advisors | 10,000 | $60.0K | 0.00% | +10,000 | New |
| Insigneo Advisory Services, LLC | 10,000 | $60.0K | 0.00% | +10,000 | New |
| Jones Financial Companies LLLP | 8,653 | $52.0K | 0.00% | +8,653 | New |
| National Bank of Canada | 7,500 | $45.0K | 0.00% | −9,500−55.9% | Reduced |
| KLP Kapitalforvaltning AS | 6,300 | $37.8K | 0.00% | +6,300 | New |
| Federation des caisses Desjardins du Quebec | 5,350 | $32.1K | 0.00% | +1,000+23.0% | Added |
| Advisor Group Holdings, Inc. | 2,529 | $15.2K | 0.00% | +98+4.0% | Added |
| Anchor Investment Management, LLC | 2,100 | $12.6K | 0.00% | 00.0% | Unchanged |
| Cherry Tree Wealth Management, LLC | 692 | $4.16K | 0.00% | 00.0% | Unchanged |
| Farther Finance Advisors, LLC | 248 | $1.52K | 0.00% | 00.0% | Unchanged |
| Steward Partners Investment Advisory, LLC | 200 | $1.20K | 0.00% | 00.0% | Unchanged |
| DB Fitzpatrick & Co, Inc | 150 | $901 | 0.00% | +80+114.3% | Added |
| Tower Research Capital LLC (TRC) | 103 | $619 | 0.00% | −1,577−93.9% | Reduced |
| Redwood Park Advisors LLC | 87 | $523 | 0.00% | +87 | New |
| Signature Resources Capital Management, LLC | 70 | $420 | 0.00% | +70 | New |
| Root Financial Partners, LLC | 50 | $300 | 0.00% | 00.0% | Unchanged |
| CoreCap Advisors, LLC | 7 | $42 | 0.00% | 00.0% | Unchanged |
| Senator Investment Group LP | 0 | $0 | 0.00% | −900,000−100.0% | Sold out |
| Cantor Fitzgerald, L. P. | 0 | $0 | 0.00% | −550,000−100.0% | Sold out |
| HBK Investments L P | 0 | $0 | 0.00% | −500,000−100.0% | Sold out |
| Jane Street Group, LLC | 0 | $0 | 0.00% | −301,213−100.0% | Sold out |
| Highbridge Capital Management LLC | 0 | $0 | 0.00% | −244,000−100.0% | Sold out |
| Danske Bank A/S | 0 | $0 | 0.00% | −213,401−100.0% | Sold out |
| Walleye Capital LLC | 0 | $0 | 0.00% | −210,581−100.0% | Sold out |
| XTX Topco Ltd | 0 | $0 | 0.00% | −97,218−100.0% | Sold out |
| SkyView Investment Advisors, LLC | 0 | $0 | 0.00% | −83,844−100.0% | Sold out |
| Jump Financial, LLC | 0 | $0 | 0.00% | −77,900−100.0% | Sold out |
| Two Sigma Investments, LP | 0 | $0 | 0.00% | −57,712−100.0% | Sold out |
| Engineers Gate Manager LP | 0 | $0 | 0.00% | −51,654−100.0% | Sold out |