Terrestrial Energy Inc.
IMSR- 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; 110 institutions reported holding it in 13F filings for Q2 2026, worth $151.3M in total; no superinvestor holds it.
Other share classesIMSRW
13F holders, Q1 2025
Institutional positions in Terrestrial Energy Inc. as of Mar 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
- 45
- +10 vs. Q4 2024
- Shares held
- 20.2M
- +4.06M (+25.1%) vs. Q4 2024
- Total value
- $213.4M
- +$51.1M (+31.5%) vs. Q4 2024
- New holders
- 18
- 3 more added
- Sold out
- 8
- 15 more reduced
Compare with Q4 2024: new holders, sold out and not filed yet
Holders and value by quarter
Institutions reporting IMSR 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 | 110 | $151.3M |
| Q1 2026 | 88 | $111.3M |
| Q4 2025 | 82 | $130.7M |
| Q3 2025 | 66 | $162.5M |
| Q2 2025 | 65 | $209.6M |
| Q1 2025 | 45 | $213.4M |
| Q4 2024 | 35 | $162.3M |
| 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, Q1 2025
Shares, value and share of portfolio for each institution holding Terrestrial Energy Inc.; share changes are against Q4 2024.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Linden Advisors LP | 2,000,000 | $21.1M | 0.14% | +2,000,000 | New |
| Magnetar Financial LLC | 1,959,198 | $20.7M | 0.27% | +1,959,198 | New |
| Picton Mahoney Asset Management | 1,780,000 | $18.7M | 0.64% | −200,000−10.1% | Reduced |
| Vivaldi Asset Management, LLC | 1,728,952 | $18.2M | 1.31% | −341,046−16.5% | Reduced |
| LMR Partners LLP | 1,411,689 | $14.9M | 0.30% | −88,311−5.9% | Reduced |
| CNH Partners LLC | 1,288,674 | $13.6M | 0.33% | −275,159−17.6% | Reduced |
| MMCAP International Inc. SPC | 980,000 | $10.3M | 1.76% | +980,000 | New |
| D. E. Shaw & Co., Inc. | 970,000 | $10.3M | 0.01% | +50,000+5.4% | Added |
| Encompass Capital Advisors LLC | 946,165 | $10.0M | 0.38% | +946,165 | New |
| Westchester Capital Management, LLC | 670,481 | $7.09M | 0.41% | 00.0% | Unchanged |
| Goldman Sachs Group Inc | 618,772 | $6.51M | 0.00% | −21,252−3.3% | Reduced |
| Calamos Advisors LLC | 500,000 | $5.29M | 0.02% | +500,000 | New |
| Two Sigma Investments, LP | 500,000 | $5.26M | 0.01% | 00.0% | Unchanged |
| Commonwealth of Pennsylvania Public School Empls Retrmt Sys | 405,962 | $4.27M | 0.03% | +405,962 | New |
| Whitebox Advisors LLC | 400,000 | $4.21M | 0.14% | 00.0% | Unchanged |
| Rivernorth Capital Management, LLC | 400,000 | $4.21M | 0.22% | 00.0% | Unchanged |
| Polar Asset Management Partners Inc. | 355,845 | $3.74M | 0.12% | +355,845 | New |
| Context Capital Management, LLC | 300,000 | $3.16M | 0.12% | +300,000 | New |
| Berkley W R Corp | 297,240 | $3.13M | 0.23% | 00.0% | Unchanged |
| Bulldog Investors, LLP | 275,903 | $2.90M | 0.79% | −73,995−21.1% | Reduced |
| Wolverine Asset Management LLC | 254,029 | $2.67M | 0.05% | −511,965−66.8% | Reduced |
| DLD Asset Management, LP | 229,636 | $2.42M | 0.35% | +229,636 | New |
| Gritstone Asset Management LLC | 223,847 | $2.35M | 2.47% | −771−0.3% | Reduced |
| Millennium Management LLC | 200,000 | $2.10M | 0.00% | −250,000−55.6% | Reduced |
| Athos Capital Ltd | 200,000 | $2.10M | 2.67% | +200,000 | New |
| Verition Fund Management LLC | 182,612 | $1.93M | 0.01% | −20,800−10.2% | Reduced |
| Tenor Capital Management Co., L.P. | 175,000 | $1.84M | 0.03% | 00.0% | Unchanged |
| Periscope Capital Inc. | 155,000 | $1.63M | 0.91% | −45,000−22.5% | Reduced |
| Mint Tower Capital Management B.V. | 144,903 | $1.52M | 0.57% | 00.0% | Unchanged |
| Deltec Asset Management LLC | 115,000 | $1.21M | 0.26% | −35,000−23.3% | Reduced |
| HRT Financial LP | 99,320 | $1.05M | 0.01% | +99,320 | New |
| Toronto Dominion Bank | 75,445 | $797.8K | 0.00% | +43,758+138.1% | Added |
| Balyasny Asset Management LLC | 65,000 | $687.4K | 0.00% | +65,000 | New |
| Decagon Asset Management LLP | 56,178 | $591.0K | 0.54% | +56,178 | New |
| Schonfeld Strategic Advisors LLC | 45,009 | $473.5K | 0.00% | −29,991−40.0% | Reduced |
| Susquehanna International Group, LLP | 40,291 | $426.1K | 0.00% | +40,291 | New |
| Glazer Capital, LLC | 36,831 | $387.0K | 0.02% | +36,831 | New |
| Tuttle Tactical Management | 35,000 | $368.2K | 1.62% | 00.0% | Unchanged |
| UBS Group AG | 31,050 | $326.6K | 0.00% | +14,430+86.8% | Added |
| PenderFund Capital Management Ltd. | 30,000 | $295.9K | 0.25% | 00.0% | Unchanged |
| Mizuho Securities USA LLC | 25,837 | $271.3K | 0.01% | +25,837 | New |
| Morgan Stanley | 20,000 | $210.4K | 0.00% | +20,000 | New |
| Virtu Financial LLC | 13,540 | $143.0K | 0.01% | −132,479−90.7% | Reduced |
| Clear Street LLC | 165 | $1.74K | 0.00% | −7,199−97.8% | Reduced |
| FNY Investment Advisers, LLC | 100 | $1.00K | 0.00% | +100 | New |
| Karpus Management, Inc. | 0 | $0 | 0.00% | −1,293,947−100.0% | Sold out |
| Highbridge Capital Management LLC | 0 | $0 | 0.00% | −500,000−100.0% | Sold out |
| Centiva Capital, LP | 0 | $0 | 0.00% | −195,221−100.0% | Sold out |
| Dakota Wealth Management | 0 | $0 | 0.00% | −103,450−100.0% | Sold out |
| Heights Capital Management, Inc | 0 | $0 | 0.00% | −80,000−100.0% | Sold out |
| Kepos Capital LP | 0 | $0 | 0.00% | −30,000−100.0% | Sold out |
| Fir Tree Capital Management LP | 0 | $0 | 0.00% | −20,519−100.0% | Sold out |
| Radcliffe Capital Management, L.P. | 0 | $0 | 0.00% | −13,400−100.0% | Sold out |