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 |
|---|---|---|---|---|---|
| FNY Investment Advisers, LLC | 100 | $1.00K | 0.00% | +100 | New |
| Clear Street LLC | 165 | $1.74K | 0.00% | −7,199−97.8% | Reduced |
| Virtu Financial LLC | 13,540 | $143.0K | 0.01% | −132,479−90.7% | Reduced |
| Morgan Stanley | 20,000 | $210.4K | 0.00% | +20,000 | New |
| Mizuho Securities USA LLC | 25,837 | $271.3K | 0.01% | +25,837 | New |
| PenderFund Capital Management Ltd. | 30,000 | $295.9K | 0.25% | 00.0% | Unchanged |
| UBS Group AG | 31,050 | $326.6K | 0.00% | +14,430+86.8% | Added |
| Tuttle Tactical Management | 35,000 | $368.2K | 1.62% | 00.0% | Unchanged |
| Glazer Capital, LLC | 36,831 | $387.0K | 0.02% | +36,831 | New |
| Susquehanna International Group, LLP | 40,291 | $426.1K | 0.00% | +40,291 | New |
| Schonfeld Strategic Advisors LLC | 45,009 | $473.5K | 0.00% | −29,991−40.0% | Reduced |
| Decagon Asset Management LLP | 56,178 | $591.0K | 0.54% | +56,178 | New |
| Balyasny Asset Management LLC | 65,000 | $687.4K | 0.00% | +65,000 | New |
| Toronto Dominion Bank | 75,445 | $797.8K | 0.00% | +43,758+138.1% | Added |
| HRT Financial LP | 99,320 | $1.05M | 0.01% | +99,320 | New |
| Deltec Asset Management LLC | 115,000 | $1.21M | 0.26% | −35,000−23.3% | Reduced |
| Mint Tower Capital Management B.V. | 144,903 | $1.52M | 0.57% | 00.0% | Unchanged |
| Periscope Capital Inc. | 155,000 | $1.63M | 0.91% | −45,000−22.5% | Reduced |
| Tenor Capital Management Co., L.P. | 175,000 | $1.84M | 0.03% | 00.0% | Unchanged |
| Verition Fund Management LLC | 182,612 | $1.93M | 0.01% | −20,800−10.2% | 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 |
| Gritstone Asset Management LLC | 223,847 | $2.35M | 2.47% | −771−0.3% | Reduced |
| DLD Asset Management, LP | 229,636 | $2.42M | 0.35% | +229,636 | New |
| Wolverine Asset Management LLC | 254,029 | $2.67M | 0.05% | −511,965−66.8% | Reduced |
| Bulldog Investors, LLP | 275,903 | $2.90M | 0.79% | −73,995−21.1% | Reduced |
| Berkley W R Corp | 297,240 | $3.13M | 0.23% | 00.0% | Unchanged |
| Context Capital Management, LLC | 300,000 | $3.16M | 0.12% | +300,000 | New |
| Polar Asset Management Partners Inc. | 355,845 | $3.74M | 0.12% | +355,845 | 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 |
| Commonwealth of Pennsylvania Public School Empls Retrmt Sys | 405,962 | $4.27M | 0.03% | +405,962 | New |
| Two Sigma Investments, LP | 500,000 | $5.26M | 0.01% | 00.0% | Unchanged |
| Calamos Advisors LLC | 500,000 | $5.29M | 0.02% | +500,000 | New |
| Goldman Sachs Group Inc | 618,772 | $6.51M | 0.00% | −21,252−3.3% | Reduced |
| Westchester Capital Management, LLC | 670,481 | $7.09M | 0.41% | 00.0% | Unchanged |
| Encompass Capital Advisors LLC | 946,165 | $10.0M | 0.38% | +946,165 | New |
| D. E. Shaw & Co., Inc. | 970,000 | $10.3M | 0.01% | +50,000+5.4% | Added |
| MMCAP International Inc. SPC | 980,000 | $10.3M | 1.76% | +980,000 | New |
| CNH Partners LLC | 1,288,674 | $13.6M | 0.33% | −275,159−17.6% | Reduced |
| LMR Partners LLP | 1,411,689 | $14.9M | 0.30% | −88,311−5.9% | Reduced |
| Vivaldi Asset Management, LLC | 1,728,952 | $18.2M | 1.31% | −341,046−16.5% | Reduced |
| Picton Mahoney Asset Management | 1,780,000 | $18.7M | 0.64% | −200,000−10.1% | Reduced |
| Magnetar Financial LLC | 1,959,198 | $20.7M | 0.27% | +1,959,198 | New |
| Linden Advisors LP | 2,000,000 | $21.1M | 0.14% | +2,000,000 | 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 |