Terrestrial Energy Inc. /DE/ (IMSR) — Institutional Holders, Q2 2026
111 institutional investment managers reported a IMSR position on SEC Form 13F-HR for the quarter ended June 30, 2026, with a combined reported value of $151.1M. Every filer is listed below, ranked by position value, 100 per page; this page shows ranks 1 to 100. Put and call option positions are excluded, and a firm filing several lots or share classes is shown once with its total.
IMSR in Q2 2026: what funds did
Funds that filed a 13F for both Q1 2026 and Q2 2026, by what they did with the common stock. Share counts are adjusted for any split between the two quarters; dollar figures are the change in shares at this quarter’s price.
Biggest buyers
- VANGUARD CAPITAL MANAGEMENTAdded · +2,110,744 sh+$14.9M
- UBS Group AGAdded · +1,278,596 sh+$9.1M
- HRT FINANCIALNew · +1,125,849 sh+$8.0M
- Pacer AdvisorsNew · +574,618 sh+$4.1M
- HIGHBRIDGE CAPITAL MANAGEMENTNew · +244,000 sh+$1.7M
Biggest sellers
- CITADEL ADVISORSTrimmed · -1,267,197 sh-$9.0M
- D. E. ShawTrimmed · -546,809 sh-$3.9M
- Alyeska Investment Group, L.P.Trimmed · -500,000 sh-$3.5M
- GOLDMAN SACHS GROUPTrimmed · -336,813 sh-$2.4M
- HITE Hedge Asset ManagementSold out · -240,113 sh-$1.7M
IMSR 13F holders ranked 1–100 of 111
| # | Institution | Shares | Value | % of portfolio | QoQShares vs Q1 2026 |
|---|---|---|---|---|---|
| 1 | VANGUARD CAPITAL MANAGEMENT#1 · 3,414,196 sh | 3,414,196 | $24.2M | <0.01% | +161.9% |
| 2 | EXCHANGE TRADED CONCEPTS#2 · 2,160,074 sh | 2,160,074 | $15.3M | 0.07% | +3.3% |
| 3 | UBS Group AG#3 · 1,772,173 sh | 1,772,173 | $12.5M | <0.01% | +259.0% |
| 4 | HRT FINANCIAL#4 · 1,140,849 sh | 1,140,849 | $8.0M | 0.02% | +2064.8% |
| 5 | BlackRock#5 · 1,074,524 sh | 1,074,524 | $7.6M | <0.01% | -4.1% |
| 6 | JPMORGAN CHASE#6 · 966,797 sh | 966,797 | $6.8M | <0.01% | -9.9% |
| 7 | GEODE CAPITAL MANAGEMENT#7 · 693,934 sh | 693,934 | $4.9M | <0.01% | +5.2% |
| 8 | LMR Partners LLP#8 · 690,702 sh | 690,702 | $4.9M | 0.02% | 0.0% |
| 9 | D. E. Shaw#9 · 667,968 sh | 667,968 | $4.7M | <0.01% | -45.0% |
| 10 | Hudson Bay Capital Management#10 · 589,293 sh | 589,293 | $4.2M | 0.01% | +30.3% |
| 11 | Pacer Advisors#11 · 574,618 sh | 574,618 | $4.1M | 0.01% | New |
| 12 | SUSQUEHANNA INTERNATIONAL GROUP, LLP#12 · 571,832 sh | 571,832 | $4.0M | <0.01% | +73.1% |
| 13 | WINTON GROUP Ltd#13 · 504,000 sh | 504,000 | $3.6M | 0.12% | +1.6% |
| 14 | MORGAN STANLEY#14 · 412,815 sh | 412,815 | $2.9M | <0.01% | +44.6% |
| 15 | Verition Fund Management#15 · 374,958 sh | 374,958 | $2.7M | <0.01% | -15.7% |
| 16 | VANGUARD FIDUCIARY#16 · 365,772 sh | 365,772 | $2.6M | <0.01% | +21.8% |
| 17 | Vennlight Capital Management#17 · 353,010 sh | 353,010 | $2.5M | 1.68% | -38.7% |
| 18 | STATE STREET#18 · 346,696 sh | 346,696 | $2.5M | <0.01% | +0.3% |
| 19 | CHARLES SCHWAB INVESTMENT MANAGEMENT#19 · 333,599 sh | 333,599 | $2.4M | <0.01% | -1.3% |
| 20 | HIGHBRIDGE CAPITAL MANAGEMENT#20 · 244,000 sh | 244,000 | $1.7M | 0.04% | New |
| 21 | JANE STREET GROUP#21 · 240,719 sh | 240,719 | $1.7M | <0.01% | New |
| 22 | Alyeska Investment Group, L.P.#22 · 222,000 sh | 222,000 | $1.6M | <0.01% | -69.3% |
| 23 | RENAISSANCE TECHNOLOGIES#23 · 183,800 sh | 183,800 | $1.3M | <0.01% | -54.9% |
| 24 | Creek Drive Management Group#24 · 175,000 sh | 175,000 | $1.2M | 0.60% | -47.0% |
| 25 | CastleKnight Management#25 · 165,400 sh | 165,400 | $1.2M | 0.02% | +172.5% |
| 26 | FNY Investment Advisers#26 · 151,650 sh | 151,650 | $1.1M | — | +129.2% |
| 27 | Shay Capital#27 · 134,539 sh | 134,539 | $952.5K | 0.06% | +13.9% |
| 28 | NORTHERN#28 · 126,539 sh | 126,539 | $895.9K | <0.01% | +1.6% |
| 29 | Yorkville Advisors Global#29 · 122,000 sh | 122,000 | $863.8K | 1.00% | 0.0% |
| 30 | Harraden Circle Investments#30 · 122,000 sh | 122,000 | $863.8K | 0.11% | 0.0% |
| 31 | COMMONWEALTH EQUITY SERVICES#31 · 110,794 sh | 110,794 | $784.4K | <0.01% | +10.6% |
| 32 | TORONTO DOMINION BANK#32 · 110,000 sh | 110,000 | $778.8K | <0.01% | -51.3% |
| 33 | Magnetar Financial#33 · 244,000 sh | 244,000 | $737.1K | <0.01% | 0.0% |
| 34 | PERISCOPE CAPITAL#34 · 122,000 sh | 122,000 | $729.6K | 0.06% | 0.0% |
| 35 | MILLENNIUM MANAGEMENT#35 · 96,035 sh | 96,035 | $679.9K | <0.01% | New |
| 36 | XTX Topco Ltd#36 · 94,601 sh | 94,601 | $669.8K | <0.01% | New |
| 37 | Mount Lucas Management#37 · 93,000 sh | 93,000 | $658.4K | 0.23% | +80.6% |
| 38 | Aquatic Capital Management#38 · 88,952 sh | 88,952 | $629.8K | 0.02% | New |
| 39 | SONA ASSET MANAGEMENT (US)#39 · 85,566 sh | 85,566 | $605.8K | 0.01% | 0.0% |
| 40 | Squarepoint Ops#40 · 85,500 sh | 85,500 | $605.3K | <0.01% | -50.6% |
| 41 | VOLORIDGE INVESTMENT MANAGEMENT#41 · 83,374 sh | 83,374 | $590.3K | <0.01% | New |
| 42 | Engineers Gate Manager#42 · 82,295 sh | 82,295 | $582.6K | <0.01% | New |
| 43 | TIEMANN INVESTMENT ADVISORS#43 · 75,995 sh | 75,995 | $538.0K | 0.19% | 0.0% |
| 44 | MOORE CAPITAL MANAGEMENT#44 · 75,000 sh | 75,000 | $531.0K | <0.01% | 0.0% |
| 45 | IMC-Chicago#45 · 74,991 sh | 74,991 | $530.9K | <0.01% | +254.5% |
| 46 | Parallax Volatility Advisers, L.P.#46 · 68,518 sh | 68,518 | $485.1K | <0.01% | New |
| 47 | AQR CAPITAL MANAGEMENT#47 · 59,777 sh | 59,777 | $423.2K | <0.01% | New |
| 48 | GOLDMAN SACHS GROUP#48 · 59,425 sh | 59,425 | $420.7K | 0.00% | -85.0% |
| 49 | Swiss National Bank#49 · 56,600 sh | 56,600 | $400.7K | <0.01% | 0.0% |
| 50 | BALYASNY ASSET MANAGEMENT L.P.#50 · 56,461 sh | 56,461 | $399.7K | <0.01% | -72.6% |
| 51 | ALLSTATE#51 · 50,205 sh | 50,205 | $355.5K | <0.01% | New |
| 52 | MMCAP International SPC#52 · 44,279 sh | 44,279 | $313.5K | 0.03% | 0.0% |
| 53 | LPL Financial#53 · 42,381 sh | 42,381 | $300.1K | <0.01% | +58.7% |
| 54 | TUDOR INVESTMENT ET AL#54 · 42,225 sh | 42,225 | $299.0K | <0.01% | +275.2% |
| 55 | ExodusPoint Capital Management#55 · 40,205 sh | 40,205 | $284.7K | <0.01% | New |
| 56 | SIMON QUICK ADVISORS#56 · 40,000 sh | 40,000 | $283.2K | — | 0.0% |
| 57 | Y-Intercept (Hong Kong) Ltd#57 · 38,150 sh | 38,150 | $270.1K | — | New |
| 58 | CANADA PENSION PLAN INVESTMENT BOARD#58 · 29,000 sh | 29,000 | $205.3K | <0.01% | New |
| 59 | AMERICAN CENTURY COMPANIES#59 · 26,768 sh | 26,768 | $189.5K | <0.01% | New |
| 60 | UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AME#60 · 26,399 sh | 26,399 | $186.9K | 0.00% | -58.4% |
| 61 | BANK OF AMERICA#61 · 25,431 sh | 25,431 | $180.1K | 0.00% | -80.8% |
| 62 | PRELUDE CAPITAL MANAGEMENT#62 · 25,000 sh | 25,000 | $177.0K | 0.01% | +98.1% |
| 63 | Advisory Services Network#63 · 24,555 sh | 24,555 | $173.8K | <0.01% | +17.3% |
| 64 | DRW Securities#64 · 22,000 sh | 22,000 | $155.8K | <0.01% | 0.0% |
| 65 | Legal & General Group Plc#65 · 21,537 sh | 21,537 | $152.5K | 0.00% | +41.4% |
| 66 | Foundations Investment Advisors#66 · 21,000 sh | 21,000 | $148.7K | <0.01% | New |
| 67 | SLT#67 · 21,000 sh | 21,000 | $148.7K | — | New |
| 68 | MARSHALL WACE, LLP#68 · 20,278 sh | 20,278 | $143.6K | <0.01% | -22.8% |
| 69 | Vanguard Global Advisers#69 · 19,963 sh | 19,963 | $141.3K | <0.01% | -26.2% |
| 70 | VANGUARD ASSET MANAGEMENT, Ltd#70 · 19,453 sh | 19,453 | $137.7K | <0.01% | 0.0% |
| 71 | FLAX POND CAPITAL#71 · 21,000 sh | 21,000 | $126.1K | 0.10% | +31.2% |
| 72 | Zurcher Kantonalbank (Zurich Cantonalbank)#72 · 17,093 sh | 17,093 | $121.0K | <0.01% | New |
| 73 | Bank of New York Mellon#73 · 16,911 sh | 16,911 | $119.7K | 0.00% | -0.7% |
| 74 | JONES FINANCIAL COMPANIES LLLP#74 · 17,382 sh | 17,382 | $117.0K | 0.00% | +100.9% |
| 75 | BANK OF MONTREAL#75 · 16,469 sh | 16,469 | $116.6K | 0.00% | +31.5% |
| 76 | Valeo Financial Advisors#76 · 15,000 sh | 15,000 | $106.2K | — | New |
| 77 | DnB Asset Management AS#77 · 11,430 sh | 11,430 | $80.9K | <0.01% | New |
| 78 | Vanguard Investments Australia, Ltd.#78 · 10,674 sh | 10,674 | $75.6K | <0.01% | 0.0% |
| 79 | CITADEL ADVISORS#79 · 10,061 sh | 10,061 | $71.2K | 0.00% | -99.2% |
| 80 | Cornerstone Advisory#80 · 10,003 sh | 10,003 | $70.8K | <0.01% | New |
| 81 | FIRST FOUNDATION ADVISORS#81 · 10,000 sh | 10,000 | $70.8K | <0.01% | 0.0% |
| 82 | INSIGNEO ADVISORY SERVICES#82 · 10,000 sh | 10,000 | $70.8K | <0.01% | 0.0% |
| 83 | Rockefeller Capital Management L.P.#83 · 7,000 sh | 7,000 | $49.6K | <0.01% | New |
| 84 | Federation des caisses Desjardins du Quebec#84 · 6,450 sh | 6,450 | $45.7K | <0.01% | +20.6% |
| 85 | KLP KAPITALFORVALTNING AS#85 · 6,300 sh | 6,300 | $44.6K | <0.01% | 0.0% |
| 86 | US BANCORP \DE\#86 · 4,500 sh | 4,500 | $31.9K | 0.00% | New |
| 87 | SkyView Investment Advisors#87 · 3,844 sh | 3,844 | $27.0K | 0.02% | New |
| 88 | ROYAL BANK OF CANADA#88 · 3,333 sh | 3,333 | $24.0K | 0.00% | -87.0% |
| 89 | OSAIC#89 · 2,737 sh | 2,737 | $19.4K | 0.00% | +8.2% |
| 90 | Anchor Investment Management#90 · 2,100 sh | 2,100 | $14.9K | <0.01% | 0.0% |
| 91 | NATIONAL BANK OF CANADA#91 · 1,999 sh | 1,999 | $14.1K | 0.00% | -73.3% |
| 92 | CITIGROUP#92 · 1,510 sh | 1,510 | $10.7K | 0.00% | -94.4% |
| 93 | FMR#93 · 1,300 sh | 1,300 | $9.2K | 0.00% | New |
| 94 | SRS Capital Advisors#94 · 903 sh | 903 | $6.4K | 0.00% | New |
| 95 | Cherry Tree Wealth Management#95 · 692 sh | 692 | $4.9K | — | 0.0% |
| 96 | EverSource Wealth Advisors#96 · 594 sh | 594 | $4.2K | <0.01% | New |
| 97 | Caitong International Asset Management , Ltd#97 · 447 sh | 447 | $3.2K | <0.01% | New |
| 98 | Essential Partners#98 · 407 sh | 407 | $2.9K | — | New |
| 99 | BARCLAYS PLC#99 · 354 sh | 354 | $2.5K | 0.00% | New |
| 100 | Farther Finance Advisors#100 · 301 sh | 301 | $2.1K | — | +21.4% |
Funds that sold out of IMSR in Q2 2026 (16)
Held IMSR at the end of Q1 2026 and filed a Q2 2026 13F without it. Not in the list above, because they no longer hold it. Largest prior position first.
| Institution | Shares sold | Value in Q1 2026 |
|---|---|---|
| HITE Hedge Asset Management240,113 sh | 240,113 | $1.4M |
| K2 PRINCIPAL FUND, L.P.80,000 sh | 80,000 | $480.8K |
| Massar Capital Management65,000 sh | 65,000 | $390.3K |
| Diametric Capital59,191 sh | 59,191 | $355.4K |
| BLUEFIN CAPITAL MANAGEMENT32,463 sh | 32,463 | $194.9K |
| Brevan Howard Capital Management25,153 sh | 25,153 | $151.0K |
| FLOW TRADERS U.S.21,530 sh | 21,530 | $129.0K |
| Schonfeld Strategic Advisors19,254 sh | 19,254 | $115.6K |
| LEVEL FOUR ADVISORY SERVICES16,375 sh | 16,375 | $98.3K |
| T3 Companies16,295 sh | 16,295 | $97.9K |
| WealthPlan Investment Management10,206 sh | 10,206 | $61.3K |
| DB Fitzpatrick150 sh | 150 | $901.00 |
| Tower Research Capital (TRC)103 sh | 103 | $619.00 |
| Signature Resources Capital Management70 sh | 70 | $420.00 |
| Root Financial Partners50 sh | 50 | $300.00 |
| CoreCap Advisors7 sh | 7 | $42.00 |
Source: Form 13F-HR filings on SEC EDGAR, Q2 2026. Values are as reported by each manager at quarter end. “% of portfolio” is the position’s share of the manager’s total reported 13F value for the same quarter. “New” means the manager filed a 13F for Q1 2026 without this position; a dash means no comparison is available. Where a manager’s own filing is internally inconsistent its value is withheld and it is listed last. 13F data shows reported holdings, not recommendations.