Terrestrial EnergyIMSR
13F holders, Q2 2025 (June 30)65holders +20
29new positions
8sold out
3famous investors
$11.15avg. 13F price*
At the end of Q2 2025, 65 institutions reported holding Terrestrial Energy Inc. (IMSR) in their 13F filings, up 20 from Q1 2025. 29 opened new positions and 8 sold out. The largest holders were Linden Advisors LP ($21.6M), Magnetar Financial LLC ($16.5M) and First Trust Capital Management L.P. ($11.7M). 3 famous investors held it, including David E. Shaw (0.0% of D. E. Shaw & Co.'s portfolio), Israel Englander (0.0% of Millennium Management's portfolio) and Ken Griffin (0.0% of Citadel Advisors's portfolio).
- Company
- Terrestrial Energy Inc.
- Filed as
- HCM II ACQUISITION CORP (Q2 2025)
- CUSIP
- G43658106
- Latest filing quarter
- Q3 2025
History
Number of 13F holders
Total Exit/New Position Q1 2025 → Q2 2025
| Institutions | Total Value | |
|---|---|---|
| New Positions | 29 | $55.1M |
| Exits | 8 | $32.3M |
All 13F filers, Q1 2025 → Q2 2025: 6,012,450 shares bought and 7,432,930 shares sold, net −1,420,480 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 65 holders
| Linden Advisors LP | 2.27% | Reduce -2.5% | 1,950,000 | $21.6M |
| Magnetar Financial LLC | 0.08% | Reduce -28.7% | 1,397,166 | $16.5M |
| First Trust Capital Management L.P. | 0.79% | Reduce -39.2% | 1,051,124 | $11.7M |
| Vennlight Capital Management, LP | 12.52% | New | 1,027,934 | $11.4M |
| D. E. Shaw & Co. | 0.01% | No change | 970,000 | $10.8M |
| MMCAP International Inc. SPC | 1.31% | Reduce -1.8% | 962,068 | $10.7M |
| Picton Mahoney Asset Management | 0.15% | Reduce -47.1% | 942,081 | $10.5M |
| LMR Partners LLP | 0.24% | Reduce -33.3% | 941,287 | $10.4M |
| Arosa Capital Management LP | 4.57% | New | 560,000 | $6.2M |
| Shay Capital LLC | 1.39% | New | 548,258 | $6.1M |
| Balyasny Asset Management L.P. | 0.01% | Add +738.3% | 544,894 | $6.0M |
| Calamos Advisors LLC | 0.03% | No change | 500,000 | $5.5M |
| DLD Asset Management, LP | 2.52% | Add +104.2% | 468,825 | $5.2M |
| Cantor Fitzgerald, L. P. | 0.13% | New | 466,287 | $5.2M |
| Goldman Sachs Group Inc. | 0.00% | Reduce -29.7% | 435,071 | $4.8M |
| Commonwealth of Pennsylvania Public School Empls Retrmt SYS | 0.02% | No change | 405,962 | $4.5M |
| Rivernorth Capital Management, LLC | 0.25% | No change | 400,000 | $4.4M |
| Berkley W R Corp. | 0.27% | Add +33.9% | 398,021 | $4.4M |
| Senator Investment Group LP | 0.15% | New | 340,000 | $3.8M |
| Whitebox Advisors LLC | 0.25% | Reduce -20.3% | 318,914 | $3.5M |
| MYDA Advisors LLC | 0.93% | New | 300,000 | $3.3M |
| Governors Lane LP | 0.46% | New | 300,000 | $3.3M |
| Polar Asset Management Partners Inc. | 0.10% | Reduce -27.7% | 257,307 | $2.9M |
| PEAK6 LLC | 0.10% | New | 253,361 | $2.8M |
| HRT Financial LP | 0.01% | Add +131.6% | 230,069 | $2.6M |
| Scoggin Management LP | 1.05% | New | 200,000 | $2.2M |
| Millennium Management | 0.00% | No change | 200,000 | $2.2M |
| Westchester Capital Management, LLC | 0.13% | Reduce -70.2% | 199,691 | $2.2M |
| J. Goldman & Co LP | 0.06% | New | 176,249 | $2.0M |
| Gritstone Asset Management LLC | 1.99% | Reduce -22.3% | 173,847 | $1.9M |
| Verition Fund Management LLC | 0.01% | Reduce -17.9% | 150,000 | $1.7M |
| Mint Tower Capital Management B.V. | 0.46% | No change | 144,903 | $1.6M |
| TENOR CAPITAL MANAGEMENT Co., L.P. | 0.22% | Reduce -18.3% | 142,960 | $1.6M |
| Geode Capital Management, LLC | 0.00% | New | 121,373 | $1.3M |
| Bulldog Investors, LLP | 0.32% | Reduce -58.9% | 113,348 | $1.3M |
| Massar Capital Management, LP | 0.83% | New | 100,000 | $1.1M |
| Wexford Capital LP | 0.31% | New | 100,000 | $1.1M |
| Deltec Asset Management LLC | 0.20% | Reduce -13.0% | 100,000 | $1.1M |
| Hidden Lake Asset Management LP | 0.54% | New | 99,370 | $1.1M |
| Periscope Capital Inc. | 0.38% | Reduce -45.2% | 85,000 | $944K |
| Wolverine Asset Management LLC | 0.07% | Reduce -67.0% | 83,869 | $931K |
| Bluefin Capital Management, LLC | 0.66% | New | 74,665 | $829K |
| Morgan Stanley | 0.00% | Add +254.8% | 70,969 | $788K |
| Citadel Advisors | 0.00% | New | 69,721 | $774K |
| Context Capital Management, LLC | 0.48% | Reduce -81.7% | 54,800 | $608K |
| Shaolin Capital Management LLC | 0.15% | New | 50,000 | $555K |
| JPMorgan Chase & Co. | 0.00% | New | 49,740 | $552K |
| Fifth Lane Capital, LP | 0.61% | New | 45,000 | $500K |
| FNY Investment Advisers, LLC | 0.20% | Add +41400.0% | 41,500 | $460K |
| Yaupon Capital Management LP | 0.03% | New | 35,139 | $390K |
| Toronto Dominion Bank | 0.00% | Reduce -54.3% | 34,485 | $383K |
| Virtu Financial LLC | 0.01% | Add +61.3% | 21,838 | $242K |
| Patriot Financial Group Insurance Agency, LLC | 0.02% | New | 18,850 | $209K |
| Susquehanna International Group, LLP | 0.00% | Reduce -62.4% | 15,146 | $168K |
| Tuttle Capital Management, LLC | 0.69% | Reduce -57.1% | 15,000 | $167K |
| National Bank of Canada | 0.00% | New | 12,568 | $139K |
| Schonfeld Strategic Advisors LLC | 0.00% | Reduce -74.7% | 11,394 | $126K |
| North Capital, Inc. | 0.06% | New | 6,000 | $67K |
| UBS Group AG | 0.00% | Reduce -88.3% | 3,648 | $40K |
| IQ EQ FUND MANAGEMENT (SINGAPORE) PRIVATE Ltd | 0.05% | New | 3,000 | $33K |
| Anchor Investment Management, LLC | 0.00% | New | 2,100 | $23K |
| Federation des caisses Desjardins du Quebec | 0.00% | New | 1,200 | $13K |
| Osaic Holdings, Inc. | 0.00% | New | 200 | $2K |
| Tower Research Capital LLC (TRC) | 0.00% | New | 105 | $1K |
| Citigroup Inc. | 0.00% | New | 50 | $555 |
"% of holder's portfolio" is IMSR's weight in each manager's 13F, not the share of Terrestrial Energy Inc. the manager owns.