Terrestrial EnergyIMSR
13F holders, Q3 2025 (September 30)66holders +1
33new positions
32sold out
3famous investors
$16.41avg. 13F price*
At the end of Q3 2025, 66 institutions reported holding Terrestrial Energy Inc. (IMSR) in their 13F filings, up 1 from Q2 2025. 33 opened new positions and 32 sold out. The largest holders were D. E. Shaw & Co. ($17.9M), Citadel Advisors ($16.9M) and Balyasny Asset Management L.P. ($14.2M). 3 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 Israel Englander (0.0% of Millennium Management's portfolio).
- Company
- Terrestrial Energy Inc.
- Filed as
- HCM II ACQUISITION CORP (Q3 2025)
- CUSIP
- G43658106
- Latest filing quarter
- Q3 2025
History
Number of 13F holders
Total Exit/New Position Q2 2025 → Q3 2025
| Institutions | Total Value | |
|---|---|---|
| New Positions | 33 | $38.1M |
| Exits | 32 | $76.5M |
All 13F filers, Q2 2025 → Q3 2025: 4,779,868 shares bought and 13,673,136 shares sold, net −8,893,268 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 66 holders
| D. E. Shaw & Co. | 0.02% | Add +12.6% | 1,092,495 | $17.9M |
| Citadel Advisors | 0.01% | Add +1377.9% | 1,030,421 | $16.9M |
| Balyasny Asset Management L.P. | 0.03% | Add +58.6% | 864,263 | $14.2M |
| LMR Partners LLP | 0.23% | Reduce -22.9% | 725,267 | $11.9M |
| Millennium Management | 0.01% | Add +214.7% | 629,363 | $10.3M |
| Susquehanna International Group, LLP | 0.01% | Add +3874.2% | 601,931 | $9.9M |
| Vennlight Capital Management, LP | 10.68% | Reduce -51.4% | 500,000 | $8.2M |
| Cantor Fitzgerald, L. P. | 0.11% | Reduce -26.8% | 341,328 | $5.6M |
| Davidson Kempner Capital Management LP | 0.09% | New | 270,540 | $4.4M |
| Sourcerock Group LLC | 0.29% | New | 257,900 | $4.2M |
| Alyeska Investment Group, L.P. | 0.01% | New | 244,672 | $4.0M |
| SIR Capital Management, L.P. | 0.32% | New | 217,600 | $3.6M |
| Linden Advisors LP | 0.33% | Reduce -89.3% | 209,426 | $3.4M |
| HRT Financial LP | 0.01% | Reduce -11.1% | 204,611 | $3.4M |
| Waratah Capital Advisors Ltd. | 0.22% | New | 198,188 | $3.3M |
| Moore Capital Management, LP | 0.06% | New | 175,000 | $2.9M |
| Shay Capital LLC | 0.48% | Reduce -70.4% | 162,146 | $2.7M |
| Berkley W R Corp. | 0.17% | Reduce -59.6% | 160,672 | $2.6M |
| Magnetar Financial LLC | 0.01% | Reduce -89.8% | 142,304 | $2.3M |
| Jane Street Group, LLC | 0.00% | New | 127,190 | $2.1M |
| Whitebox Advisors LLC | 0.12% | Reduce -63.9% | 115,000 | $1.9M |
| BlueCrest Capital Management Ltd | 0.13% | New | 110,644 | $1.8M |
| Wexford Capital LP | 0.51% | Add +2.7% | 102,712 | $1.7M |
| HITE Hedge Asset Management LLC | 0.09% | New | 102,338 | $1.7M |
| Verition Fund Management LLC | 0.01% | Reduce -32.6% | 101,145 | $1.7M |
| Sona Asset Management (us) LLC | 0.21% | New | 100,000 | $1.6M |
| Galaxy Group Investments LLC | 0.16% | New | 100,000 | $1.6M |
| Deltec Asset Management LLC | 0.20% | Reduce -25.0% | 75,000 | $1.2M |
| Morgan Stanley | 0.00% | Add +0.6% | 71,420 | $1.2M |
| Arosa Capital Management LP | 1.73% | Reduce -88.4% | 65,000 | $1.1M |
| Massar Capital Management, LP | 0.38% | Reduce -35.0% | 65,000 | $1.1M |
| Jain Global LLC | 0.01% | New | 63,363 | $1.0M |
| Geode Capital Management, LLC | 0.00% | Reduce -48.0% | 63,146 | $1.0M |
| Boothbay Fund Management, LLC | 0.03% | New | 58,698 | $963K |
| JPMorgan Chase & Co. | 0.00% | Add +6.5% | 52,946 | $869K |
| Simplex Trading, LLC | 0.02% | New | 48,514 | $796K |
| Picton Mahoney Asset Management | 0.01% | Reduce -95.5% | 42,081 | $691K |
| CastleKnight Management LP | 0.04% | New | 41,900 | $688K |
| PEAK6 LLC | 0.02% | Reduce -83.7% | 41,389 | $679K |
| Commonwealth Equity Services, LLC | 0.00% | New | 32,571 | $534K |
| MYDA Advisors LLC | 0.15% | Reduce -90.0% | 30,000 | $492K |
| Alpine Global Management, LLC | 0.13% | New | 29,300 | $481K |
| Bank of America Corp. | 0.00% | New | 27,552 | $452K |
| Nations Financial Group Inc, /Ia/ | 0.03% | New | 27,047 | $444K |
| Private Advisor Group, LLC | 0.00% | New | 22,841 | $375K |
| UBS Group AG | 0.00% | Add +500.0% | 21,889 | $359K |
| FNY Investment Advisers, LLC | 0.10% | Reduce -55.4% | 18,520 | $303K |
| Tuttle Capital Management, LLC | 1.09% | Add +16.7% | 17,500 | $287K |
| National Bank of Canada | 0.00% | Add +32.9% | 16,698 | $274K |
| EHP Funds Inc. | 0.30% | New | 13,895 | $228K |
| Maven Securities LTD | 0.04% | New | 12,200 | $200K |
| Raymond James Financial Inc. | 0.00% | New | 10,809 | $177K |
| North Capital, Inc. | 0.13% | Add +66.7% | 10,000 | $164K |
| Soltis Investment Advisors LLC | 0.01% | New | 10,000 | $164K |
| BNP Paribas Financial Markets | 0.00% | New | 10,000 | $164K |
| Royal Bank of Canada | 0.00% | New | 7,000 | $115K |
| Federation des caisses Desjardins du Quebec | 0.00% | Add +337.5% | 5,250 | $86K |
| Anchor Investment Management, LLC | 0.00% | No change | 2,100 | $34K |
| CoreCap Advisors, LLC | 0.00% | New | 1,000 | $16K |
| Group One Trading LLC | 0.00% | New | 576 | $9K |
| Osaic Holdings, Inc. | 0.00% | Add +55.0% | 310 | $4K |
| Steward Partners Investment Advisory, LLC | 0.00% | New | 200 | $3K |
| Larson Financial Group LLC | 0.00% | New | 104 | $2K |
| Koesten, Hirschmann & Crabtree, INC. | 0.00% | New | 50 | $821 |
| Redwood Park Advisors LLC | 0.00% | New | 44 | $723 |
| Wealthspire Advisors, LLC | 0.00% | New | 20 | $329 |
"% of holder's portfolio" is IMSR's weight in each manager's 13F, not the share of Terrestrial Energy Inc. the manager owns.