Terrestrial Energy Inc (IMSR) Ownership
IMSR ownership summary
as of October 18, 2026- Institutions
- 26.7% of shares outstanding
- Insiders
- 18.61% of shares outstanding
- Shares outstanding
- 82.7M
- Float
- 51.3M shares available to trade
- Short interest
- 13.31% 6.4M shares short
- Days to cover
- 4.50 short interest up 11.1% vs prior month
- Institutions 26.74%
- Insiders 18.61%
- Other investors 54.65%
IMSR top institutional holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | Vanguard Capital Management, LLC | 3.22% | 3.4M | $10.4M | +2.1M (+161.9%) | June 30, 2026 |
| 2 | Exchange Traded Concepts, LLC | 2.04% | 2.2M | $6.6M | +68,913 (+3.3%) | June 30, 2026 |
| 3 | UBS Group AG | 1.67% | 1.8M | $5.4M | +1.3M (+259.0%) | June 30, 2026 |
| 4 | HRT FINANCIAL LLC | 1.06% | 1.1M | $3.4M | +1.1M (0.0%) | June 30, 2026 |
| 5 | BlackRock Inc | 1.01% | 1.1M | $3.3M | −46,361 (−4.1%) | June 30, 2026 |
| 6 | JPMorgan Chase & Co | 0.91% | 967K | $2.9M | −106,276 (−9.9%) | June 30, 2026 |
| 7 | Geode Capital Management, LLC | 0.66% | 694K | $2.1M | +34,546 (+5.2%) | June 30, 2026 |
| 8 | LMR Partners LLP | 0.65% | 691K | $2.1M | — | June 30, 2026 |
| 9 | D. E. Shaw & Co LP | 0.63% | 668K | $2.0M | −546,809 (−45.0%) | June 30, 2026 |
| 10 | Hudson Bay Capital Management LP | 0.56% | 589K | $1.8M | +137,006 (+30.3%) | June 30, 2026 |
| 11 | Pacer Advisors, INC. | 0.54% | 575K | $1.8M | +574,618 (0.0%) | June 30, 2026 |
| 12 | Susquehanna International Group, LLP | 0.54% | 572K | $1.7M | +241,556 (+73.1%) | June 30, 2026 |
| 13 | Winton Capital Group Ltd | 0.48% | 504K | $1.5M | +7,700 (+1.6%) | June 30, 2026 |
| 14 | Morgan Stanley - Brokerage Accounts | 0.39% | 413K | $1.3M | +127,266 (+44.6%) | June 30, 2026 |
| 15 | Verition Fund Managegment, LLC | 0.35% | 375K | $1.1M | −70,000 (−15.7%) | June 30, 2026 |
| 16 | Vanguard Fiduciary Trust Co | 0.35% | 366K | $1.1M | +65,365 (+21.8%) | June 30, 2026 |
| 17 | Vennlight Capital Management, LP | 0.33% | 353K | $1.1M | −222,489 (−38.7%) | June 30, 2026 |
| 18 | State Street Corp | 0.33% | 347K | $1.1M | +1,176 (+0.3%) | June 30, 2026 |
| 19 | Charles Schwab Investment Management Inc | 0.31% | 334K | $1.0M | −4,392 (−1.3%) | June 30, 2026 |
| 20 | Magnetar Financial LLC | 0.23% | 244K | $744,200 | — | June 30, 2026 |
Value at the latest close. Change = shares bought or sold in the latest quarterly filing (13F). In the top 20, 12 holders added 5.8M shares and 6 cut 996K.
IMSR top mutual fund and ETF holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | Global X Uranium ETF | 3.68% | 3.9M | $11.9M | −8,618 (−0.2%) | September 30, 2026 |
| 2 | Vanguard MStar Total Stk Mkt Idx Invest | 2.55% | 2.7M | $8.2M | — | August 31, 2026 |
| 3 | Range Nuclear Renaissance ETF | 0.59% | 621K | $1.9M | — | September 30, 2026 |
| 4 | Pacer Data & Infrastructure Rl EsttETF | 0.48% | 504K | $1.5M | −30,771 (−5.8%) | September 30, 2026 |
| 5 | Schwab US Small-Cap ETF™ | 0.30% | 315K | $960,125 | +207 (+0.1%) | September 30, 2026 |
| 6 | Fidelity Extended Market Index | 0.26% | 277K | $845,884 | −13,535 (−4.7%) | August 31, 2026 |
| 7 | WisdomTree Uranium & Nucler Ey ETF $ Acc | 0.12% | 122K | $372,155 | −760 (−0.6%) | September 30, 2026 |
| 8 | Fidelity Total Market Index | 0.10% | 107K | $325,795 | — | August 31, 2026 |
| 9 | Fidelity Series Total Market Index | 0.08% | 84K | $256,572 | +3,398 (+4.2%) | August 31, 2026 |
| 10 | Vanguard Balanced Index Inv | 0.04% | 45K | $137,524 | — | August 31, 2026 |
| 11 | Schwab US Broad Market ETF™ | 0.04% | 44K | $134,227 | +48 (+0.1%) | September 30, 2026 |
| 12 | Vanguard MStar Inst Ttl StkMktIdxInstlPl | 0.04% | 43K | $130,384 | — | August 31, 2026 |
| 13 | Nowo Global Fund A (SEK) | 0.04% | 40K | $122,000 | +40,000 (0.0%) | December 31, 2025 |
| 14 | Schwab Total Stock Market Index | 0.04% | 38K | $117,120 | — | August 31, 2026 |
| 15 | Avantis US Small Cap Equity ETF | 0.03% | 36K | $111,105 | — | September 30, 2026 |
| 16 | Fidelity ZERO Total Market Index | 0.03% | 29K | $88,139 | — | August 31, 2026 |
| 17 | Fidelity ZERO Extended Market Index | 0.02% | 23K | $69,973 | +3,139 (+15.9%) | August 31, 2026 |
| 18 | Vanguard U.S. Eq Idx £ Acc | 0.02% | 20K | $60,887 | — | August 31, 2026 |
| 19 | Themes Uranium & Nuclear ETF | 0.02% | 20K | $59,963 | — | September 30, 2026 |
| 20 | Vanguard Global Small-Cap Idx USD Acc | 0.02% | 19K | $59,332 | — | August 31, 2026 |
Funds report holdings monthly or quarterly; dates differ by fund.
Who owns IMSR
Institutional investors own 26.7% of Terrestrial Energy's shares and insiders 18.61%. The largest holder is Vanguard Capital Management, LLC with 3.22% of the shares (3.4M), as of June 30, 2026. Among the top 20 institutions, 12 added shares and 6 reduced their stake in the latest filings. Short interest is 13.31% of the float, or 4.50 days of average trading volume. The share count fell 21.9% since 2024.
Related: IMSR analyst forecast, IMSR key metrics. See the IMSR stock overview for the latest quote and news.
IMSR ownership FAQ
Who owns the most Terrestrial Energy stock?
The largest shareholders of Terrestrial Energy are Vanguard Capital Management, LLC (3.22%), Exchange Traded Concepts, LLC (2.04%), UBS Group AG (1.67%), HRT FINANCIAL LLC (1.06%), BlackRock Inc (1.01%).
What percentage of Terrestrial Energy is owned by institutions?
Institutions hold 26.7% of Terrestrial Energy's shares outstanding; insiders hold 18.61%.
Which funds own Terrestrial Energy?
The largest fund holders of Terrestrial Energy are Global X Uranium ETF (3.68%), Vanguard MStar Total Stk Mkt Idx Invest (2.55%), Range Nuclear Renaissance ETF (0.59%), Pacer Data & Infrastructure Rl EsttETF (0.48%), Schwab US Small-Cap ETF™ (0.30%).
What is Terrestrial Energy's short interest?
6.4M shares of Terrestrial Energy were sold short, 13.31% of the float; at the average daily volume it would take 4.50 days to cover.
How many shares of Terrestrial Energy are outstanding?
Terrestrial Energy has 82.7M shares outstanding, of which 51.3M are in the public float.
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