IMSR Terrestrial Energy Inc.
Terrestrial Energy Inc. (IMSR) Institutional Ownership
What the institutions did with IMSR last quarter, from their 13F filings. Counting managers rather than shares is the point: a single index fund adding to a position tells you far less than four hundred separate managers all deciding to. Positions as reported for the quarter ended June 30, 2026.
Every manager below opens. Subscribers can see any firm's whole portfolio — every position, its weight, and what they bought, trimmed and exited last quarter.
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Each block is one manager, sized by shares held and colored by how much they moved the position last quarter. Green added, red cut, grey stood pat.
Largest holders
| Manager | Shares | % of reported |
|---|---|---|
| LMR Partners LLP | 3.9M | 11.6% |
| VANGUARD CAPITAL MANAGEMENT LLC | 3.4M | 10.1% |
| CANTOR FITZGERALD, L. P. | 2.2M | 6.4% |
| EXCHANGE TRADED CONCEPTS, LLC | 2.2M | 6.4% |
| Hudson Bay Capital Management LP | 1.9M | 5.6% |
| UBS Group AG | 1.8M | 5.2% |
| PEAK6 LLC | 1.2M | 3.7% |
| HRT FINANCIAL LP | 1.1M | 3.4% |
| BlackRock, Inc. | 1.1M | 3.2% |
| Magnetar Financial LLC | 967.0K | 2.9% |
| JPMORGAN CHASE & CO | 966.8K | 2.9% |
| Caption Management, LLC | 865.4K | 2.6% |
| ARISTEIA CAPITAL, L.L.C. | 840.0K | 2.5% |
| GEODE CAPITAL MANAGEMENT, LLC | 693.9K | 2.1% |
| D. E. Shaw & Co., Inc. | 668.0K | 2.0% |
| BOOTHBAY FUND MANAGEMENT, LLC | 621.0K | 1.8% |
| MORGAN STANLEY | 616.0K | 1.8% |
| Pacer Advisors, Inc. | 574.6K | 1.7% |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | 571.8K | 1.7% |
| WINTON GROUP Ltd | 504.0K | 1.5% |
| Verition Fund Management LLC | 375.0K | 1.1% |
| VANGUARD FIDUCIARY TRUST CO | 365.8K | 1.1% |
| Vennlight Capital Management, LP | 353.0K | 1.0% |
| STATE STREET CORP | 346.7K | 1.0% |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 333.6K | 1.0% |
Largest changes
| Manager | Action | Previous | Current | Change |
|---|---|---|---|---|
| LMR Partners LLP | Increased | 690.7K | 3.9M | +3.2M |
| CANTOR FITZGERALD, L. P. | New | 0 | 2.2M | +2.2M |
| VANGUARD CAPITAL MANAGEMENT LLC | Increased | 1.3M | 3.4M | +2.1M |
| Hudson Bay Capital Management LP | Increased | 452.3K | 1.9M | +1.4M |
| UBS Group AG | Increased | 493.6K | 1.8M | +1.3M |
| CITADEL ADVISORS LLC | Reduced | 1.3M | 10.1K | -1.3M |
| PEAK6 LLC | New | 0 | 1.2M | +1.2M |
| HRT FINANCIAL LP | New | 0 | 1.1M | +1.1M |
| Caption Management, LLC | New | 0 | 865.4K | +865.4K |
| ARISTEIA CAPITAL, L.L.C. | New | 0 | 840.0K | +840.0K |
| Magnetar Financial LLC | Increased | 244.0K | 967.0K | +723.0K |
| BOOTHBAY FUND MANAGEMENT, LLC | New | 0 | 621.0K | +621.0K |
| Pacer Advisors, Inc. | New | 0 | 574.6K | +574.6K |
| D. E. Shaw & Co., Inc. | Reduced | 1.2M | 668.0K | -546.8K |
| Alyeska Investment Group, L.P. | Reduced | 722.0K | 222.0K | -500.0K |
| GOLDMAN SACHS GROUP INC | Reduced | 396.2K | 59.4K | -336.8K |
| MORGAN STANLEY | Increased | 285.5K | 616.0K | +330.4K |
| HIGHBRIDGE CAPITAL MANAGEMENT LLC | New | 0 | 244.0K | +244.0K |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Increased | 330.3K | 571.8K | +241.6K |
| JANE STREET GROUP, LLC | New | 0 | 240.7K | +240.7K |
| HITE Hedge Asset Management LLC | Sold Out | 240.1K | 0 | -240.1K |
| RENAISSANCE TECHNOLOGIES LLC | Reduced | 407.9K | 183.8K | -224.1K |
| Vennlight Capital Management, LP | Reduced | 575.5K | 353.0K | -222.5K |
| Linden Advisors LP | New | 0 | 194.6K | +194.6K |
| CastleKnight Management LP | Increased | 60.7K | 238.6K | +177.9K |
| Arosa Capital Management LP | New | 0 | 175.0K | +175.0K |
| Creek Drive Management Group LLC | Reduced | 330.0K | 175.0K | -155.0K |
| Periscope Capital Inc. | Increased | 122.0K | 274.5K | +152.5K |
| Yorkville Advisors Global, LP | Increased | 122.0K | 274.5K | +152.5K |
| Balyasny Asset Management L.P. | Reduced | 205.9K | 56.5K | -149.4K |
| TORONTO DOMINION BANK | Reduced | 226.0K | 110.0K | -116.0K |
| BANK OF AMERICA CORP /DE/ | Reduced | 132.8K | 25.4K | -107.3K |
| JPMORGAN CHASE & CO | Reduced | 1.1M | 966.8K | -106.3K |
| MILLENNIUM MANAGEMENT LLC | New | 0 | 96.0K | +96.0K |
| XTX Topco Ltd | New | 0 | 94.6K | +94.6K |
| Aquatic Capital Management LLC | New | 0 | 89.0K | +89.0K |
| Squarepoint Ops LLC | Reduced | 173.2K | 85.5K | -87.7K |
| FNY Investment Advisers, LLC | Increased | 66.2K | 151.7K | +85.5K |
| VOLORIDGE INVESTMENT MANAGEMENT, LLC | New | 0 | 83.4K | +83.4K |
| Engineers Gate Manager LP | New | 0 | 82.3K | +82.3K |
| K2 PRINCIPAL FUND, L.P. | Sold Out | 80.0K | 0 | -80.0K |
| Verition Fund Management LLC | Reduced | 445.0K | 375.0K | -70.0K |
| EXCHANGE TRADED CONCEPTS, LLC | Increased | 2.1M | 2.2M | +68.9K |
| Parallax Volatility Advisers, L.P. | New | 0 | 68.5K | +68.5K |
| Saba Capital Management, L.P. | New | 0 | 65.7K | +65.7K |
| VANGUARD FIDUCIARY TRUST CO | Increased | 300.4K | 365.8K | +65.4K |
| Massar Capital Management, LP | Sold Out | 65.0K | 0 | -65.0K |
| AQR CAPITAL MANAGEMENT LLC | New | 0 | 59.8K | +59.8K |
| Diametric Capital, LP | Sold Out | 59.2K | 0 | -59.2K |
| IMC-Chicago, LLC | Increased | 21.2K | 75.0K | +53.8K |
| Walleye Capital LLC | New | 0 | 52.6K | +52.6K |
| ALLSTATE CORP | New | 0 | 50.2K | +50.2K |
| WOLVERINE ASSET MANAGEMENT LLC | New | 0 | 50.1K | +50.1K |
| Alberta Investment Management Corp | New | 0 | 50.0K | +50.0K |
| BlackRock, Inc. | Reduced | 1.1M | 1.1M | -46.4K |
| METEORA CAPITAL, LLC | New | 0 | 43.2K | +43.2K |
| Mount Lucas Management LP | Increased | 51.5K | 93.0K | +41.5K |
| ExodusPoint Capital Management, LP | New | 0 | 40.2K | +40.2K |
| Y-Intercept (Hong Kong) Ltd | New | 0 | 38.2K | +38.2K |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC | Reduced | 63.5K | 26.4K | -37.1K |
13F filings are due 45 days after quarter end and cover long positions in U.S.-listed equities only, so this is a lagged and partial picture: shorts, bonds and foreign listings never appear. Options positions are excluded here rather than folded into the share counts. Political ownership is coming.