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 IMSR from SEC Form 13F filings across 110 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, 110 institutions disclosed 22.1M shares of Terrestrial Energy Inc. /DE/ worth $140.3M — about 20.8% of shares outstanding; the largest disclosed holder is VANGUARD CAPITAL MANAGEMENT LLC. Source: SEC Form 13F filings, parsed by EvidInvest.
110
13F holders
$140.3M
value, 2026 filers
20.8%
of shares outstanding (22.1M sh)
41
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 IMSR's shares outstanding
| # | Manager | Shares | Value | % of fund | % of co. | Δ shares QoQ |
|---|---|---|---|---|---|---|
| 1 | VANGUARD CAPITAL MANAGEMENT LLC | 3.4M | $24.2M | 0.0% | 3.2% | +161.9% |
| 2 | EXCHANGE TRADED CONCEPTS, LLC | 2.2M | $15.3M | 0.1% | 2% | +3.3% |
| 3 | UBS Group AG | 1.8M | $12.5M | 0.0% | 1.7% | +259.0% |
| 4 | HRT FINANCIAL LPNEW | 1.1M | $7,971 | 0.0% | 1.1% | new |
| 5 | BlackRock, Inc. | 1.1M | $7.6M | 0.0% | 1% | -4.1% |
| 6 | JPMORGAN CHASE & CONEW | 966,797 | $6.8M | 0.0% | 0.9% | new |
| 7 | GEODE CAPITAL MANAGEMENT, LLC | 693,934 | $4.9M | 0.0% | 0.7% | +5.2% |
| 8 | LMR Partners LLP | 690,702 | $4.9M | 0.0% | 0.7% | 0.0% |
| 9 | D. E. Shaw & Co., Inc. | 667,968 | $4.7M | 0.0% | 0.6% | -45.0% |
| 10 | Hudson Bay Capital Management LP | 589,293 | $4.2M | 0.0% | 0.6% | +30.3% |
| 11 | Pacer Advisors, Inc.NEW | 574,618 | $4,068 | 0.0% | 0.5% | new |
| 12 | SUSQUEHANNA INTERNATIONAL GROUP, LLP | 571,832 | $4.0M | 0.0% | 0.5% | +73.1% |
| 13 | WINTON GROUP Ltd | 504,000 | $3.6M | 0.1% | 0.5% | +1.6% |
| 14 | MORGAN STANLEY | 412,815 | $2.9M | 0.0% | 0.4% | +44.6% |
| 15 | Verition Fund Management LLC | 374,958 | $2.7M | 0.0% | 0.4% | -15.7% |
| 16 | VANGUARD FIDUCIARY TRUST CO | 365,772 | $2.6M | 0.0% | 0.3% | +21.8% |
| 17 | Vennlight Capital Management, LP | 353,010 | $2.5M | 1.7% | 0.3% | -38.7% |
| 18 | STATE STREET CORP | 346,696 | $2.5M | 0.0% | 0.3% | +0.3% |
| 19 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 333,599 | $2.4M | 0.0% | 0.3% | -1.3% |
| 20 | Sixth Street Partners Management Company, L.P.NEW | 333,599 | $2.4M | 0.4% | 0.3% | new |
| 21 | HIGHBRIDGE CAPITAL MANAGEMENT LLCNEW | 244,000 | $1.7M | 0.0% | 0.2% | new |
| 22 | Magnetar Financial LLC | 244,000 | $737,063 | 0.0% | 0.2% | 0.0% |
| 23 | JANE STREET GROUP, LLCNEW | 240,719 | $1.7M | 0.0% | 0.2% | new |
| 24 | Alyeska Investment Group, L.P. | 222,000 | $1.6M | 0.0% | 0.2% | -69.3% |
| 25 | CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM | 221,434 | $31,276 | 0.0% | 0.2% | +608.0% |
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.