Terrestrial EnergyIMSR
13F holders, Q1 2026 (March 31)88holders +6
30new positions
27sold out
4famous investors
$5.97avg. 13F price*
At the end of Q1 2026, 88 institutions reported holding Terrestrial Energy Inc. (IMSR) in their 13F filings, up 6 from Q4 2025. 30 opened new positions and 27 sold out. The largest holders were Exchange Traded Concepts, LLC ($12.6M), Vanguard Capital Management LLC ($7.8M) and Citadel Advisors ($7.7M). 4 famous investors held it, including David E. Shaw (0.0% of D. E. Shaw & Co.'s portfolio), Ken Griffin (0.0% of Citadel Advisors's portfolio) and Jim Simons / Peter Brown (0.0% of Renaissance Technologies's portfolio).
- Company
- Terrestrial Energy Inc.
- CUSIP
- 881454102
- Latest filing quarter
- Q2 2026
History
Number of 13F holders
Total Exit/New Position Q4 2025 → Q1 2026
| Institutions | Total Value | |
|---|---|---|
| New Positions | 30 | $23.7M |
| Exits | 27 | $21.3M |
All 13F filers, Q4 2025 → Q1 2026: 5,407,129 shares bought and 7,493,286 shares sold, net −2,086,157 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 88 holders
| Exchange Traded Concepts, LLC | 0.10% | New | 2,091,161 | $12.6M |
| Vanguard Capital Management LLC | 0.00% | — | 1,303,452 | $7.8M |
| Citadel Advisors | 0.01% | Reduce -37.1% | 1,277,258 | $7.7M |
| D. E. Shaw & Co. | 0.01% | Add +12.5% | 1,214,777 | $7.3M |
| BlackRock, Inc. | 0.00% | Add +2.6% | 1,120,885 | $6.7M |
| JPMorgan Chase & Co. | 0.00% | Reduce -8.3% | 1,073,073 | $5.9M |
| Alyeska Investment Group, L.P. | 0.01% | No change | 722,000 | $4.3M |
| LMR Partners LLP | 0.05% | Add +17.4% | 690,702 | $4.1M |
| Geode Capital Management, LLC | 0.00% | Reduce -17.2% | 659,388 | $4.0M |
| Vennlight Capital Management, LP | 3.49% | New | 575,499 | $3.5M |
| WINTON GROUP Ltd | 0.10% | Reduce -23.2% | 496,300 | $3.0M |
| UBS Group AG | 0.00% | Reduce -3.7% | 493,577 | $3.0M |
| Hudson Bay Capital Management LP | 0.02% | Reduce -38.5% | 452,287 | $2.7M |
| Verition Fund Management LLC | 0.03% | Reduce -41.0% | 444,958 | $2.7M |
| Renaissance Technologies | 0.00% | Add +136.1% | 407,900 | $2.4M |
| Goldman Sachs Group Inc. | 0.00% | Add +40.6% | 396,238 | $2.4M |
| State Street Corp. | 0.00% | Add +5.8% | 345,520 | $2.1M |
| Charles Schwab Investment Management Inc. | 0.00% | Reduce -17.7% | 337,991 | $2.0M |
| Susquehanna International Group, LLP | 0.00% | Reduce -5.2% | 330,276 | $2.0M |
| Creek Drive Management Group LLC | 1.24% | New | 330,000 | $2.0M |
| Vanguard Fiduciary Trust Co. | 0.00% | — | 300,407 | $1.8M |
| Morgan Stanley | 0.00% | Add +133.5% | 285,549 | $1.7M |
| Magnetar Financial LLC | 0.02% | Add +880.5% | 244,000 | $1.5M |
| HITE Hedge Asset Management LLC | 0.08% | New | 240,113 | $1.4M |
| Toronto Dominion Bank | 0.00% | Add +803.9% | 225,974 | $1.4M |
| Balyasny Asset Management L.P. | 0.00% | Reduce -85.3% | 205,903 | $1.2M |
| Squarepoint Ops LLC | 0.00% | Add +94.2% | 173,209 | $1.0M |
| Bank of America Corp. | 0.00% | Add +96.0% | 132,750 | $797K |
| Northern Trust Corp. | 0.00% | Reduce -20.4% | 124,537 | $748K |
| Yorkville Advisors Global, LP | 0.50% | New | 122,000 | $733K |
| Harraden Circle Investments, LLC | 0.16% | No change | 122,000 | $733K |
| Shay Capital LLC | 0.10% | Reduce -57.4% | 118,086 | $709K |
| Commonwealth Equity Services, LLC | 0.00% | Add +85.3% | 100,131 | $601K |
| Periscope Capital Inc. | 0.11% | No change | 122,000 | $580K |
| Sona Asset Management (us) LLC | 0.03% | Reduce -14.4% | 85,566 | $514K |
| K2 Principal Fund, L.P. | 0.15% | New | 80,000 | $481K |
| Tiemann Investment Advisors, LLC | 0.18% | No change | 75,995 | $456K |
| Moore Capital Management, LP | 0.02% | Add +50.0% | 75,000 | $450K |
| FNY Investment Advisers, LLC | 0.18% | Reduce -26.5% | 66,160 | $397K |
| Massar Capital Management, LP | 0.08% | No change | 65,000 | $390K |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC | 0.00% | New | 63,500 | $381K |
| CastleKnight Management LP | 0.02% | No change | 60,700 | $365K |
| Diametric Capital, LP | 0.09% | New | 59,191 | $355K |
| Swiss National Bank | 0.00% | New | 56,600 | $340K |
| Mount Lucas Management LP | 0.11% | Add +28.8% | 51,500 | $309K |
| MMCAP International Inc. SPC | 0.02% | Reduce -94.1% | 44,279 | $266K |
| Simon Quick Advisors, LLC | 0.01% | Reduce -11.1% | 40,000 | $240K |
| Bluefin Capital Management, LLC | 0.23% | New | 32,463 | $195K |
| California State Teachers Retirement System | 0.00% | New | 31,276 | $188K |
| Vanguard Global Advisers, LLC | 0.00% | — | 27,055 | $162K |
| Citigroup Inc. | 0.00% | Add +118.4% | 26,908 | $162K |
| LPL Financial LLC | 0.00% | New | 26,704 | $160K |
| Marshall Wace, LLP | 0.00% | Reduce -14.9% | 26,277 | $158K |
| Royal Bank of Canada | 0.00% | Reduce -22.3% | 25,621 | $154K |
| Brevan Howard Capital Management LP | 0.00% | Reduce -4.7% | 25,153 | $151K |
| DRW Securities, LLC | 0.01% | New | 22,000 | $132K |
| Flow Traders U.S. LLC | 0.00% | New | 21,530 | $129K |
| IMC-Chicago, LLC | 0.00% | New | 21,157 | $127K |
| Advisory Services Network, LLC | 0.00% | New | 20,935 | $126K |
| VANGUARD ASSET MANAGEMENT, Ltd | 0.00% | — | 19,453 | $117K |
| Schonfeld Strategic Advisors LLC | 0.00% | Add +8.0% | 19,254 | $116K |
| Bank of New York Mellon Corp | 0.00% | New | 17,035 | $102K |
| Level Four Advisory Services, LLC | 0.00% | New | 16,375 | $98K |
| T3 Companies, LLC | 0.14% | Reduce -42.8% | 16,295 | $98K |
| Flax Pond Capital, LLC | 0.08% | New | 16,000 | $96K |
| Legal & General Group Plc | 0.00% | New | 15,229 | $91K |
| Prelude Capital Management, LLC | 0.01% | New | 12,619 | $76K |
| Bank of Montreal | 0.00% | New | 12,520 | $75K |
| Tudor Investment Corporation | 0.00% | New | 11,254 | $68K |
| Vanguard Investments Australia, Ltd. | 0.00% | — | 10,674 | $64K |
| WealthPlan Investment Management, LLC | 0.00% | New | 10,206 | $61K |
| Insigneo Advisory Services, LLC | 0.00% | New | 10,000 | $60K |
| First Foundation Advisors | 0.00% | New | 10,000 | $60K |
| Jones Financial Companies LLLP | 0.00% | New | 8,653 | $52K |
| National Bank of Canada | 0.00% | Reduce -55.9% | 7,500 | $45K |
| KLP Kapitalforvaltning As | 0.00% | New | 6,300 | $38K |
| Federation des caisses Desjardins du Quebec | 0.00% | Add +23.0% | 5,350 | $32K |
| Osaic Holdings, Inc. | 0.00% | Add +4.0% | 2,529 | $15K |
| Anchor Investment Management, LLC | 0.00% | No change | 2,100 | $13K |
| Cherry Tree Wealth Management, LLC | 0.00% | No change | 692 | $4K |
| Farther Finance Advisors, LLC | 0.00% | No change | 248 | $2K |
| Steward Partners Investment Advisory, LLC | 0.00% | No change | 200 | $1K |
| DB Fitzpatrick & Co, Inc | 0.00% | Add +114.3% | 150 | $901 |
| Tower Research Capital LLC (TRC) | 0.00% | Reduce -93.9% | 103 | $619 |
| Redwood Park Advisors LLC | 0.00% | New | 87 | $523 |
| Signature Resources Capital Management, LLC | 0.00% | New | 70 | $420 |
| Root Financial Partners, LLC | 0.00% | No change | 50 | $300 |
| CoreCap Advisors, LLC | 0.00% | No change | 7 | $42 |
"% of holder's portfolio" is IMSR's weight in each manager's 13F, not the share of Terrestrial Energy Inc. the manager owns.