Terrestrial Energy Inc.
IMSRW- 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; 24 institutions reported holding it in 13F filings for Q2 2026, worth $39.8M in total; no superinvestor holds it.
Other share classesIMSR
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
- 28
- +4 vs. Q3 2025
- Shares held
- 10.6M
- +1.10M (+11.5%) vs. Q3 2025
- Total value
- $23.1M
- −$34.2M (−59.7%) vs. Q3 2025
- New holders
- 13
- 5 more added
- Sold out
- 9
- 10 more reduced
Compare with Q3 2025: new holders, sold out and not filed yet
Holders and value by quarter
Institutions reporting IMSRW 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 | 24 | $39.8M |
| Q1 2026 | 26 | $29.6M |
| Q4 2025 | 28 | $23.1M |
| Q3 2025 | 24 | $57.3M |
| Q2 2025 | 31 | $27.6M |
| Q1 2025 | 30 | $8.04M |
| Q4 2024 | 23 | $767.9K |
| 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 |
|---|---|---|---|---|---|
| LMR Partners LLP | 2,850,610 | $6.04M | 0.06% | +1,247,637+77.8% | Added |
| Cantor Fitzgerald, L. P. | 2,575,000 | $5.46M | 0.16% | −149,172−5.5% | Reduced |
| PEAK6 LLC | 1,186,146 | $2.51M | 0.07% | +16,934+1.4% | Added |
| Magnetar Financial LLC | 904,994 | $1.92M | 0.02% | +229,995+34.1% | Added |
| Caption Management, LLC | 806,543 | $1.71M | 0.08% | +806,543 | New |
| Morgan Stanley | 342,279 | $725.6K | 0.00% | +59,201+20.9% | Added |
| Highbridge Capital Management LLC | – | $646.6K | 0.03% | – | New |
| Arosa Capital Management LP | 275,000 | $583.0K | 0.37% | −175,000−38.9% | Reduced |
| Hudson Bay Capital Management LP | 247,400 | $524.5K | 0.00% | +247,400 | New |
| Balyasny Asset Management LLC | 213,913 | $453.5K | 0.00% | −446,087−67.6% | Reduced |
| Aristeia Capital LLC | 202,481 | $430.3K | 0.01% | −26,833−11.7% | Reduced |
| Linden Advisors LP | 194,560 | $413.4K | 0.00% | −255,440−56.8% | Reduced |
| Walleye Capital LLC | 154,680 | $327.9K | 0.00% | +154,680 | New |
| Periscope Capital Inc. | 152,500 | $225.7K | 0.04% | +152,500 | New |
| Jain Global LLC | 90,918 | $192.7K | 0.00% | +90,918 | New |
| Saba Capital Management, L.P. | 75,681 | $160.4K | 0.01% | +26,749+54.7% | Added |
| CastleKnight Management LP | 73,200 | $155.2K | 0.01% | −80,000−52.2% | Reduced |
| MYDA Advisors LLC | 73,179 | $155.1K | 0.04% | −207,821−74.0% | Reduced |
| Wolverine Asset Management LLC | 71,569 | $151.7K | 0.00% | +71,569 | New |
| Meteora Capital, LLC | 50,200 | $106.4K | 0.01% | −20,000−28.5% | Reduced |
| Alberta Investment Management Corp | 50,000 | $106.0K | 0.00% | +50,000 | New |
| DLD Asset Management, LP | 14,323 | $30.4K | 0.00% | +14,323 | New |
| Stoic Point Capital Management LLC | 13,402 | $28.4K | 0.02% | +13,402 | New |
| Warberg Asset Management LLC | 11,000 | $23.3K | 0.01% | +11,000 | New |
| Clear Street Group Inc. | 10,000 | $21.2K | 0.00% | −20,000−66.7% | Reduced |
| Advisor Group Holdings, Inc. | 600 | $1.27K | 0.00% | +600 | New |
| Royal Bank of Canada | 300 | $1.00K | 0.00% | −200−40.0% | Reduced |
| Clear Street Markets LLC | 1 | $2 | 0.00% | +1 | New |
| CNH Partners LLC | 0 | $0 | 0.00% | −241,236−100.0% | Sold out |
| Whitebox Advisors LLC | 0 | $0 | 0.00% | −200,000−100.0% | Sold out |
| BNP Paribas Arbitrage, SA | 0 | $0 | 0.00% | −99,332−100.0% | Sold out |
| Picton Mahoney Asset Management | 0 | $0 | 0.00% | −59,282−100.0% | Sold out |
| Rivernorth Capital Management, LLC | 0 | $0 | 0.00% | −49,700−100.0% | Sold out |
| Mint Tower Capital Management B.V. | 0 | $0 | 0.00% | −33,505−100.0% | Sold out |
| Boothbay Fund Management, LLC | 0 | $0 | 0.00% | −11,476−100.0% | Sold out |
| Fulton Breakefield Broenniman LLC | 0 | $0 | 0.00% | −18,405−100.0% | Sold out |
| Bank of America Corp | 0 | $0 | 0.00% | −308−100.0% | Sold out |