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, Q1 2026
Institutional positions in Terrestrial Energy Inc. as of Mar 31, 2026. 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
- 26
- −2 vs. Q4 2025
- Shares held
- 11.0M
- +337.7K (+3.2%) vs. Q4 2025
- Total value
- $29.6M
- +$6.54M (+28.3%) vs. Q4 2025
- New holders
- 5
- 4 more added
- Sold out
- 7
- 8 more reduced
Compare with Q4 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, Q1 2026
Shares, value and share of portfolio for each institution holding Terrestrial Energy Inc.; share changes are against Q4 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| LMR Partners LLP | 3,347,510 | $8.67M | 0.08% | +496,900+17.4% | Added |
| Hudson Bay Capital Management LP | 1,303,050 | $3.37M | 0.02% | +1,055,650+426.7% | Added |
| PEAK6 LLC | 1,186,146 | $3.07M | 0.09% | 00.0% | Unchanged |
| Cantor Fitzgerald, L. P. | 1,083,051 | $2.81M | 0.10% | −1,491,949−57.9% | Reduced |
| Boothbay Fund Management, LLC | 390,000 | $2.34M | 0.06% | +390,000 | New |
| Caption Management, LLC | 865,372 | $2.24M | 0.11% | +58,829+7.3% | Added |
| Magnetar Financial LLC | 780,000 | $2.02M | 0.02% | −124,994−13.8% | Reduced |
| Aristeia Capital LLC | 735,393 | $1.89M | 0.04% | +532,912+263.2% | Added |
| Morgan Stanley | 280,768 | $727.2K | 0.00% | −61,511−18.0% | Reduced |
| Linden Advisors LP | 194,560 | $500.0K | 0.00% | 00.0% | Unchanged |
| Arosa Capital Management LP | 175,000 | $453.3K | 0.30% | −100,000−36.4% | Reduced |
| Walleye Capital LLC | 139,986 | $362.6K | 0.00% | −14,694−9.5% | Reduced |
| Periscope Capital Inc. | 152,500 | $292.8K | 0.05% | 00.0% | Unchanged |
| CastleKnight Management LP | 73,200 | $189.6K | 0.01% | 00.0% | Unchanged |
| Saba Capital Management, L.P. | 65,681 | $170.1K | 0.01% | −10,000−13.2% | Reduced |
| Alberta Investment Management Corp | 50,000 | $129.5K | 0.00% | 00.0% | Unchanged |
| Wolverine Asset Management LLC | 48,722 | $126.2K | 0.00% | −22,847−31.9% | Reduced |
| Balyasny Asset Management LLC | 40,743 | $104.9K | 0.00% | −173,170−81.0% | Reduced |
| Virtu Financial LLC | 28,421 | $74.0K | 0.00% | +28,421 | New |
| Stoic Point Capital Management LLC | 13,402 | $34.7K | 0.03% | 00.0% | Unchanged |
| Clear Street Group Inc. | 10,000 | $25.9K | 0.00% | 00.0% | Unchanged |
| Advisory Services Network, LLC | 6,050 | $15.7K | 0.00% | +6,050 | New |
| Rockefeller Capital Management L.P. | 6,000 | $15.5K | 0.00% | +6,000 | New |
| Federation des caisses Desjardins du Quebec | 2,000 | $5.18K | 0.00% | +2,000 | New |
| Advisor Group Holdings, Inc. | 600 | $1.55K | 0.00% | 00.0% | Unchanged |
| Clear Street Markets LLC | 1 | $3 | 0.00% | 00.0% | Unchanged |
| Highbridge Capital Management LLC | 0 | $0 | 0.00% | – | Sold out |
| Jain Global LLC | 0 | $0 | 0.00% | −90,918−100.0% | Sold out |
| MYDA Advisors LLC | 0 | $0 | 0.00% | −73,179−100.0% | Sold out |
| Meteora Capital, LLC | 0 | $0 | 0.00% | −50,200−100.0% | Sold out |
| DLD Asset Management, LP | 0 | $0 | 0.00% | −14,323−100.0% | Sold out |
| Warberg Asset Management LLC | 0 | $0 | 0.00% | −11,000−100.0% | Sold out |
| Royal Bank of Canada | 0 | $0 | 0.00% | −300−100.0% | Sold out |