Who owns Terrestrial Energy Inc. /DE/?
Prices and market caps: Cboe delayed data, at least 15 minutes delayed. Not real-time. Fundamentals from company filings.
Institutional ownership of IMSRW from SEC Form 13F filings across 24 reporting managers. All positions are from one synchronized reporting period — 2026-06-30 books, filed up to 45 days after quarter end — so every row is comparable.
As of the 2026-06-30 reporting period, 24 institutions disclosed 11.2M shares of Terrestrial Energy Inc. /DE/ worth $39.7M — about 10.6% of shares outstanding; the largest disclosed holder is LMR Partners LLP. Source: SEC Form 13F filings, parsed by EvidInvest.
24
13F holders
$39.7M
value, 2026 filers
10.6%
of shares outstanding (11.2M sh)
3
new positions (2026 filers)
Top institutional holders
ordered by shares owned · positions as of 2026-06-30 · % of fund = share of the manager's own book · % of co. = share of IMSRW's shares outstanding
| # | Manager | Shares | Value | % of fund | % of co. | Δ shares QoQ |
|---|---|---|---|---|---|---|
| 1 | LMR Partners LLP | 3.2M | $11.0M | 0.0% | 3.1% | -3.0% |
| 2 | Hudson Bay Capital Management LP | 1.3M | $4.4M | 0.0% | 1.2% | -0.5% |
| 3 | PEAK6 LLC | 1.2M | $4.2M | 0.0% | 1.2% | +4.2% |
| 4 | CANTOR FITZGERALD, L. P. | 1.1M | $3.5M | 0.0% | 1% | 0.0% |
| 5 | Caption Management, LLC | 865,372 | $2.9M | 0.0% | 0.8% | 0.0% |
| 6 | ARISTEIA CAPITAL, L.L.C. | 840,047 | $2.8M | 0.0% | 0.8% | +14.2% |
| 7 | Magnetar Financial LLC | 723,000 | $2.4M | 0.0% | 0.7% | -7.3% |
| 8 | BOOTHBAY FUND MANAGEMENT, LLC | 621,000 | $4.4M | 0.1% | 0.6% | +59.2% |
| 9 | MORGAN STANLEY | 203,165 | $686,698 | 0.0% | 0.2% | -27.6% |
| 10 | Linden Advisors LP | 194,560 | $647,885 | 0.0% | 0.2% | 0.0% |
| 11 | Arosa Capital Management LP | 175,000 | $591,500 | 0.1% | 0.2% | 0.0% |
| 12 | Periscope Capital Inc. | 152,500 | $417,850 | 0.0% | 0.1% | 0.0% |
| 13 | Yorkville Advisors Global, LPNEW | 152,499 | $515,446 | 0.6% | 0.1% | new |
| 14 | CastleKnight Management LP | 73,200 | $238,632 | 0.0% | 0.1% | 0.0% |
| 15 | Saba Capital Management, L.P. | 65,681 | $218,718 | 0.0% | 0.1% | 0.0% |
| 16 | Walleye Capital LLC | 52,616 | $177,842 | 0.0% | 0% | -62.4% |
| 17 | WOLVERINE ASSET MANAGEMENT LLC | 50,067 | $169,226 | 0.0% | 0% | +2.8% |
| 18 | Alberta Investment Management Corp | 50,000 | $169,000 | 0.0% | 0% | 0.0% |
| 19 | Meteora Capital, LLCNEW | 43,200 | $146,016 | 0.0% | 0% | new |
| 20 | Virtu Financial LLC | 23,041 | $75 | 0.0% | 0% | -18.9% |
| 21 | Stoic Point Capital Management LLC | 13,402 | $45,299 | 0.0% | 0% | 0.0% |
| 22 | US BANCORP \DE\NEW | 11,655 | $39,394 | 0.0% | 0% | new |
| 23 | Clear Street Group Inc. | 10,000 | $33,800 | 0.0% | 0% | 0.0% |
| 24 | Rockefeller Capital Management L.P. | 6,000 | $20,280 | 0.0% | 0% | 0.0% |
Source: SEC Form 13F-HR filings (institutional managers over $100M in US-listed positions). 13Fs disclose long positions only, up to 45 days after quarter end; each manager's latest filed quarter is shown per row and dollar values are the manager's filed marks. Aggregates labeled "2026 filers" count only managers whose latest book is a 2026 quarter. Related: valuation · options positioning · supply chain. Research, not investment advice.