TERRESTRIAL ENERGY INC (IMSR) Institutional Shareholders
TERRESTRIAL ENERGY INC (IMSR) is currently reported in institutional portfolios tracked by InsiderSet based on the latest available SEC Form 13F filings for the quarter ended June 30, 2026. The institutional investors covered on this page collectively reported approximately $151.46M in IMSR holdings during the latest filing period.
Vanguard Capital Management Llc is currently the largest disclosed institutional shareholder of IMSR tracked by InsiderSet, reporting ownership valued at approximately $24.17M in its June 30, 2026 SEC Form 13F filing. Based on current market prices and the latest disclosed share count, the position is now estimated to be worth approximately $14.20M, representing an estimated loss of -41.24% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 61% of the total disclosed IMSR value among the investors covered in this analysis. Major shareholders include Vanguard Capital Management Llc, Exchange Traded Concepts, Llc, Ubs Group Ag, and several other long-term asset managers with concentrated positions in TERRESTRIAL ENERGY INC (IMSR).
This page ranks the largest institutional IMSR shareholders using publicly disclosed SEC Form 13F data, including reported values, estimated current holding values, portfolio allocation percentages, ownership concentration metrics, and historical holding changes across major hedge funds and investment firms.
Institutional Holders
109
Total Reported Value
$151.46M
Largest Holder
Vanguard Capital Management Llc
Largest Position
$24.17M
Insider Transactions (90d)
0
Latest Filing Quarter
Q2 2026
New Institutional Positions
143
Funds Exiting Positions
0
| Name | Investor/Manager | Portfolio % | Quantity | Reported Balance | Current Estimated Value | Gain/loss Since Filing | Estimated Portfolio Performance |
|---|---|---|---|---|---|---|---|
| Vanguard Capital Management Llc | 0.00% | 3,414,196 | $24,172,508 | $14,203,055 | -$9,969,453 | -41.24% | |
| Exchange Traded Concepts, Llc | 0.08% | 2,160,074 | $15,293,324 | $8,985,908 | -$6,307,416 | -41.24% | |
| Ubs Group Ag | 0.00% | 1,772,173 | $12,546,985 | $7,372,240 | -$5,174,745 | -41.24% | |
| Hrt Financial Lp | 0.01% | 1,125,849 | $7,971,000 | $4,683,532 | -$3,287,468 | -41.24% | |
| Blackrock, Inc. | 0.00% | 1,074,524 | $7,607,630 | $4,470,020 | -$3,137,610 | -41.24% | |
| Jpmorgan Chase & Co | 0.00% | 966,797 | $6,777,247 | $4,021,876 | -$2,755,371 | -40.66% | |
| Geode Capital Management, Llc | 0.00% | 693,934 | $4,915,460 | $2,886,765 | -$2,028,695 | -41.27% | |
| Lmr Partners Llp | 0.04% | 690,702 | $4,890,170 | $2,873,320 | -$2,016,850 | -41.24% | |
| D. E. Shaw & Co., Inc. | 0.00% | 667,968 | $4,729,214 | $2,778,747 | -$1,950,467 | -41.24% | |
| Hudson Bay Capital Management Lp | 0.02% | 589,293 | $4,172,195 | $2,451,459 | -$1,720,736 | -41.24% | |
| Pacer Advisors, Inc. | 0.01% | 574,618 | $4,068,000 | $2,390,411 | -$1,677,589 | -41.24% | |
| Susquehanna International Group, Llp | 0.00% | 571,832 | $4,048,571 | $2,378,821 | -$1,669,750 | -41.24% | |
| Winton Group Ltd | 0.12% | 504,000 | $3,568,320 | $2,096,640 | -$1,471,680 | -41.24% | |
| Morgan Stanley | 0.00% | 412,815 | $2,922,730 | $1,717,310 | -$1,205,420 | -41.24% | |
| Verition Fund Management Llc | 0.02% | 374,958 | $2,654,703 | $1,559,825 | -$1,094,878 | -41.24% | |
| Vanguard Fiduciary Trust Co | 0.00% | 365,772 | $2,589,666 | $1,521,612 | -$1,068,054 | -41.24% | |
| Vennlight Capital Management, Lp | 1.68% | 353,010 | $2,499,311 | $1,468,522 | -$1,030,789 | -41.24% | |
| State Street Corp | 0.00% | 346,696 | $2,454,608 | $1,442,255 | -$1,012,353 | -41.24% | |
| Charles Schwab Investment Management Inc | 0.00% | 333,599 | $2,361,881 | $1,387,772 | -$974,109 | -41.24% | |
| Highbridge Capital Management Llc | 0.06% | 244,000 | $1,710,440 | $1,015,040 | -$695,400 | -40.66% | |
| Jane Street Group, Llc | 0.00% | 240,719 | $1,704,290 | $1,001,391 | -$702,899 | -41.24% | |
| Alyeska Investment Group, L.P. | 0.00% | 222,000 | $1,571,760 | $923,520 | -$648,240 | -41.24% | |
| Renaissance Technologies LLC | Jim Simons | 0.00% | 183,800 | $1,301,304 | $764,608 | -$536,696 | -41.24% |
| Creek Drive Management Group Llc | 0.77% | 175,000 | $1,239,000 | $728,000 | -$511,000 | -41.24% | |
| Castleknight Management Lp | 0.04% | 165,400 | $1,171,032 | $688,064 | -$482,968 | -41.24% | |
| Fny Investment Advisers, Llc | 0.39% | 151,650 | $1,073,000 | $630,864 | -$442,136 | -41.21% | |
| Shay Capital Llc | 0.11% | 134,539 | $952,536 | $559,682 | -$392,854 | -41.24% | |
| Northern Trust Corp | 0.00% | 126,539 | $895,896 | $526,402 | -$369,494 | -41.24% | |
| Harraden Circle Investments, Llc | 0.11% | 122,000 | $863,760 | $507,520 | -$356,240 | -41.24% | |
| Yorkville Advisors Global, Lp | 1.00% | 122,000 | $863,760 | $507,520 | -$356,240 | -41.24% | |
| Commonwealth Equity Services, Llc | 0.00% | 110,794 | $784,417 | $460,903 | -$323,514 | -41.24% | |
| Toronto Dominion Bank | 0.00% | 110,000 | $778,800 | $457,600 | -$321,200 | -41.24% | |
| Magnetar Financial Llc | 0.01% | 244,000 | $737,063 | $1,015,040 | +$277,977 | +37.71% | |
| Periscope Capital Inc. | 0.12% | 122,000 | $729,560 | $507,520 | -$222,040 | -30.43% | |
| Millennium Management Llc | 0.00% | 96,035 | $679,928 | $399,506 | -$280,422 | -41.24% | |
| Xtx Topco Ltd | 0.01% | 94,601 | $669,775 | $393,540 | -$276,235 | -41.24% | |
| Mount Lucas Management Lp | 0.23% | 93,000 | $658,440 | $386,880 | -$271,560 | -41.24% | |
| Aquatic Capital Management Llc | 0.02% | 88,952 | $629,780 | $370,040 | -$259,740 | -41.24% | |
| Sona Asset Management (Us) Llc | 0.02% | 85,566 | $605,807 | $355,955 | -$249,852 | -41.24% | |
| Squarepoint Ops Llc | 0.00% | 85,500 | $605,340 | $355,680 | -$249,660 | -41.24% | |
| Voloridge Investment Management, Llc | 0.00% | 83,374 | $590,288 | $346,836 | -$243,452 | -41.24% | |
| Engineers Gate Manager Lp | 0.01% | 82,295 | $582,649 | $342,347 | -$240,302 | -41.24% | |
| Tiemann Investment Advisors, Llc | 0.19% | 75,995 | $538,045 | $316,139 | -$221,906 | -41.24% | |
| Moore Capital Management, Lp | 0.01% | 75,000 | $531,000 | $312,000 | -$219,000 | -41.24% | |
| Imc-Chicago, Llc | 0.00% | 74,991 | $530,936 | $311,963 | -$218,973 | -41.24% | |
| Parallax Volatility Advisers, L.P. | 0.02% | 68,518 | $485,107 | $285,035 | -$200,072 | -41.24% | |
| Aqr Capital Management Llc | 0.00% | 59,777 | $423,221 | $248,672 | -$174,549 | -41.24% | |
| Goldman Sachs Group Inc | 0.00% | 59,425 | $420,729 | $247,208 | -$173,521 | -41.24% | |
| Swiss National Bank | 0.00% | 56,600 | $400,728 | $235,456 | -$165,272 | -41.24% | |
| Balyasny Asset Management L.P. | 0.00% | 56,461 | $399,744 | $234,878 | -$164,866 | -41.24% |
Frequently asked questions about IMSR
Who owns the most IMSR stock?
The largest holders of IMSR are typically major institutional investors such as asset managers and hedge funds reporting on Form 13F. The table above ranks tracked superinvestors by reported position size using the latest available filings for TERRESTRIAL ENERGY INC (IMSR).
Is IMSR widely held by superinvestors?
Many widely followed stocks like IMSR appear across numerous superinvestor portfolios because of liquidity, index inclusion, and fundamentals. The holder count and table above show how broadly IMSR is represented among the institutional managers we track.
What do “Current Estimated Value”, “Gain/loss Since Filing”, and “Estimated Portfolio Performance” mean?
Current Estimated Value is reported share quantity from the latest 13F times our most recent split-adjusted U.S. session close. Gain/loss Since Filing is that estimate minus the reported 13F dollar value; Estimated Portfolio Performance is that difference as a percent of the reported value. Green means the estimate is above the filing value; red means below (not purchase cost). If many filers share the same implied filing price per share, the performance % may match across rows. These are not official fund marks or live quotes.