Ranked by reported Q1 2026 13F market value
Share of total reported institutional value in IMSR held by the largest 10 / 25 filers.
| # | Institution | Shares Held | Market Value | QoQ Change | Ownership % | % of Fund |
|---|---|---|---|---|---|---|
| 1 | EXCHANGE TRADED CONCEPTS, LLC | 2.1M | $12.6M | β | 2.528% | 0.09% |
| 2 | CITADEL ADVISORS LLC | 2.0M | $11.8M | -18.6% | 2.376% | 0.01% |
| 3 | SUSQUEHANNA INTERNATIONAL GROUP, LLP | 1.6M | $9.8M | +23.0% | 1.966% | 0.00% |
| 4 | VANGUARD CAPITAL MANAGEMENT LLC | 1.3M | $7.8M | β | 1.576% | 0.00% |
| 5 | D. E. Shaw & Co., Inc. | 1.2M | $7.3M | +12.5% | 1.469% | 0.01% |
| 6 | BlackRock, Inc. | 1.1M | $6.7M | +2.6% | 1.355% | 0.00% |
| 7 | Alyeska Investment Group, L.P. | 722K | $4.3M | 0.0% | 0.873% | 0.01% |
| 8 | LMR Partners LLP | 691K | $4.1M | +17.4% | 0.835% | 0.03% |
| 9 | GEODE CAPITAL MANAGEMENT, LLC | 659K | $4.0M | -17.2% | 0.797% | 0.00% |
| 10 | Vennlight Capital Management, LP | 575K | $3.5M | β | 0.696% | 3.49% |
| 11 | WINTON GROUP Ltd | 496K | $3.0M | -23.2% | 0.600% | 0.10% |
| 12 | UBS Group AG | 494K | $3.0M | -3.7% | 0.597% | 0.00% |
| 13 | Hudson Bay Capital Management LP | 452K | $2.7M | β | 0.547% | 0.03% |
| 14 | Verition Fund Management LLC | 445K | $2.7M | -41.0% | 0.538% | 0.02% |
| 15 | RENAISSANCE TECHNOLOGIES LLC | 408K | $2.4M | +136.1% | 0.493% | 0.00% |
| 16 | GOLDMAN SACHS GROUP INC | 396K | $2.4M | +40.6% | 0.479% | 0.00% |
| 17 | STATE STREET CORP | 346K | $2.1M | +5.8% | 0.418% | 0.00% |
| 18 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 338K | $2.0M | -17.7% | 0.409% | 0.00% |
| 19 | Creek Drive Management Group LLC | 330K | $2.0M | β | 0.399% | 1.18% |
| 20 | VANGUARD FIDUCIARY TRUST CO | 300K | $1.8M | β | 0.363% | 0.00% |
| 21 | MORGAN STANLEY | 286K | $1.7M | +133.5% | 0.345% | 0.00% |
| 22 | Magnetar Financial LLC | 244K | $1.5M | +880.5% | 0.295% | 0.01% |
| 23 | HITE Hedge Asset Management LLC | 240K | $1.4M | β | 0.290% | 0.08% |
| 24 | TORONTO DOMINION BANK | 226K | $1.4M | +803.9% | 0.273% | 0.00% |
| 25 | BALYASNY ASSET MANAGEMENT LLC | 206K | $1.2M | -85.3% | 0.249% | 0.00% |
denotes a marquee investor (Buffett, Burry, ARK, Tiger Global, Pershing Square, Baupost and other widely-followed managers). β% of Fundβ shows how much of that investorβs total 13F portfolio is invested in IMSR β a direct measure of their conviction.
Filings activity in IMSR during Q1 2026, grouped by how each filer changed its position.
2 quarters of 13F filings Β· Ξ columns show change vs prior quarter
| Quarter | Inst. Holders | Ξ Holders | Ownership % | Ξ Ownership | Total 13F Value | Ξ Value |
|---|---|---|---|---|---|---|
| Q1 2026 | 85 | +9.0% | 19.48% | 1.33 pp | $116M | 6.4% |
| Q4 2025 | 78 | β | 20.81% | β | $124M | β |
Source: SEC 13F institutional filings. Ownership % requires market cap data and will show once linked. Ξ columns compare to the immediately prior filed quarter.
Quick answers to the most common questions about buying IMSR stock.
Based on Q1 2026 13F filings, institutional ownership of Terrestrial Energy Inc. stands at 19.5%, held across 85 reporting institutions.
EXCHANGE TRADED CONCEPTS, LLC is the largest reported institutional holder of IMSR, with approximately 2,091,161 shares worth $0.01B as of Q1 2026.
Yes β 3 widely-followed marquee investors appear among the top 25 institutional holders of IMSR, including CITADEL ADVISORS LLC, SUSQUEHANNA INTERNATIONAL GROUP, LLP, RENAISSANCE TECHNOLOGIES LLC.
Our composite Smart Money Score for IMSR is 53 out of 100 (Neutral). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
36 institutions opened new positions in IMSR during Q1 2026, while 29 fully exited. 21 added to existing positions and 28 trimmed.
IMSR institutional ownership fell by 1.33 percentage points quarter-over-quarter, with a net change of +7 holders.
The top 10 institutions account for 61.7% of all reported 13F value in IMSR, and the top 25 account for 88.5%.
All data is sourced from SEC Form 13F filings, which institutional investment managers with at least $100M in assets are required to file each quarter. We process every 13F filing from EDGAR and recompute the aggregates after each cycle. Insider transactions are sourced from Form 4 filings.
Terrestrial Energy Inc. (IMSR) Institutional Ownership