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, Q3 2025
Institutional positions in Terrestrial Energy Inc. as of Sep 30, 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
- 24
- −6 vs. Q2 2025
- Shares held
- 9.54M
- −2.20M (−18.8%) vs. Q2 2025
- Total value
- $57.3M
- +$29.9M (+108.7%) vs. Q2 2025
- New holders
- 8
- 4 more added
- Sold out
- 14
- 7 more reduced
1 institution that held it in Q2 2025 haven't filed for Q3 2025 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q2 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, Q3 2025
Shares, value and share of portfolio for each institution holding Terrestrial Energy Inc.; share changes are against Q2 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Cantor Fitzgerald, L. P. | 2,724,172 | $16.3M | 0.32% | −91,161−3.2% | Reduced |
| LMR Partners LLP | 1,602,973 | $9.62M | 0.12% | +52,900+3.4% | Added |
| PEAK6 LLC | 1,169,212 | $7.02M | 0.18% | +594,124+103.3% | Added |
| Magnetar Financial LLC | 674,999 | $4.09M | 0.02% | −305,100−31.1% | Reduced |
| Balyasny Asset Management LLC | 660,000 | $4.00M | 0.01% | +85,000+14.8% | Added |
| Linden Advisors LP | 450,000 | $2.72M | 0.02% | −50,000−10.0% | Reduced |
| Arosa Capital Management LP | 450,000 | $2.70M | 4.15% | 00.0% | Unchanged |
| Morgan Stanley | 283,078 | $1.70M | 0.00% | 00.0% | Unchanged |
| MYDA Advisors LLC | 281,000 | $1.69M | 0.51% | +141,697+101.7% | Added |
| Aristeia Capital LLC | 229,314 | $1.38M | 0.04% | +229,314 | New |
| CNH Partners LLC | 241,236 | $1.32M | 0.03% | −875,692−78.4% | Reduced |
| Whitebox Advisors LLC | 200,000 | $1.20M | 0.02% | 00.0% | Unchanged |
| CastleKnight Management LP | 153,200 | $928.4K | 0.05% | +153,200 | New |
| BNP Paribas Arbitrage, SA | 99,332 | $596.0K | 0.00% | +99,332 | New |
| Meteora Capital, LLC | 70,200 | $421.2K | 0.04% | +70,200 | New |
| Picton Mahoney Asset Management | 59,282 | $355.0K | 0.00% | −505,000−89.5% | Reduced |
| Rivernorth Capital Management, LLC | 49,700 | $298.2K | 0.02% | −150,300−75.1% | Reduced |
| Saba Capital Management, L.P. | 48,932 | $295.3K | 0.01% | 00.0% | Unchanged |
| Mint Tower Capital Management B.V. | 33,505 | $201.0K | 0.03% | −38,946−53.8% | Reduced |
| Boothbay Fund Management, LLC | 11,476 | $188.3K | 0.00% | +11,476 | New |
| Clear Street Group Inc. | 30,000 | $180.0K | 0.00% | +30,000 | New |
| Fulton Breakefield Broenniman LLC | 18,405 | $110.4K | 0.01% | 00.0% | Unchanged |
| Royal Bank of Canada | 500 | $3.00K | 0.00% | +500 | New |
| Bank of America Corp | 308 | $1.85K | 0.00% | +308 | New |
| MMCAP International Inc. SPC | 0 | $0 | 0.00% | −490,000−100.0% | Sold out |
| Calamos Advisors LLC | 0 | $0 | 0.00% | −250,000−100.0% | Sold out |
| K2 Principal Fund, L.P. | 0 | $0 | 0.00% | −177,489−100.0% | Sold out |
| Governors Lane LP | 0 | $0 | 0.00% | −141,101−100.0% | Sold out |
| CSS LLC | 0 | $0 | 0.00% | −123,216−100.0% | Sold out |
| Gritstone Asset Management LLC | 0 | $0 | 0.00% | −111,926−100.0% | Sold out |
| Tenor Capital Management Co., L.P. | 0 | $0 | 0.00% | −87,500−100.0% | Sold out |
| Polar Asset Management Partners Inc. | 0 | $0 | 0.00% | −80,763−100.0% | Sold out |
| Context Capital Management, LLC | 0 | $0 | 0.00% | −74,868−100.0% | Sold out |
| Periscope Capital Inc. | 0 | $0 | 0.00% | −32,500−100.0% | Sold out |
| Wolverine Asset Management LLC | 0 | $0 | 0.00% | −31,055−100.0% | Sold out |
| Bulldog Investors, LLP | 0 | $0 | 0.00% | −25,000−100.0% | Sold out |
| Parallax Volatility Advisers, L.P. | 0 | $0 | 0.00% | −15,078−100.0% | Sold out |
| Schonfeld Strategic Advisors LLC | 0 | $0 | 0.00% | −14,997−100.0% | Sold out |
| Clear Street LLC | – | – | – | – | Not filed |