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IMSR

Terrestrial Energy Inc. /DE/
$6.46 -0.37 (-5.42%) At close · Jul 2
Market Cap
$1.07B
Shares
105,935,254

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

Holders: 91
Total Value: $127,731,856
Total Shares: 21,270,924

Institutional Ownership Trend

2 quarters

Holder Concentration

Across 91 13F filers · Δ vs Dec 31, 2025
Top Holder
9.8%
Dec 2025 → Mar 2026 · range 9.5% – 9.8%
+0.4 pts
Top 5
38.6%
Dec 2025 → Mar 2026 · range 31.9% – 38.6%
+6.6 pts
Top 10
58.6%
Dec 2025 → Mar 2026 · range 51.5% – 58.6%
+7.1 pts
HHI
456
Dec 2025 → Mar 2026 · range 387 – 456
Broadly held+69

Quarterly Activity

vs Dec 31, 2025
New
32
Increased
21
Decreased
26
Sold Out
30
Unchanged
12
Holder count: +2
Institutional value: -24.9%
Shares held: -23.6%

Top Buyers

vs Dec 31, 2025
Institution Added Now Holds Open
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP +304,544 1,626,076
Large RENAISSANCE TECHNOLOGIES LLC +235,100 407,900
Mid Magnetar Financial LLC +219,115 244,000
Large TORONTO DOMINION BANK +200,974 225,974
Mega MORGAN STANLEY +163,242 285,549

Top Sellers

vs Dec 31, 2025
Institution Sold Now Holds Open
Mega CITADEL ADVISORS LLC −2,751,646 1,965,158
Large Balyasny Asset Management L.P. −1,195,050 205,903
Small MMCAP International Inc. SPC −705,721 44,279
Micro Vennlight Capital Management, LP −502,001 575,499
Large DANSKE BANK A/S −483,401 100,000

Top New Positions

vs Dec 31, 2025
Institution Acquired Value (USD) Open
Mid EXCHANGE TRADED CONCEPTS, LLC 2,091,161 $12,557,421
Mega VANGUARD CAPITAL MANAGEMENT LLC 1,303,452 $7,827,229
Small Creek Drive Management Group LLC 330,000 $1,981,650
Mega VANGUARD FIDUCIARY TRUST CO 300,407 $1,803,944
Mid HITE Hedge Asset Management LLC 240,113 $1,441,878

Top Sold-Out Positions

vs Dec 31, 2025
Institution Previously Held Last Value (USD) Open
Mega VANGUARD GROUP INC 1,849,446 $11,300,114
Mid Senator Investment Group LP 900,000 $5,499,000
Mid CANTOR FITZGERALD, L. P. 550,000 $3,360,500
Mid HBK INVESTMENTS L P 550,000 $3,360,500
Small Galaxy Group Investments LLC 500,000 $3,055,000
Filter: New 32 Increased 21 Reduced 26 Sold out 30 Unchanged 12
Showing 97 of 97
All Common Calls Puts
Export CSV
Holder Value (USD) % of 13F Shares Open
Mid EXCHANGE TRADED CONCEPTS, LLC $12,557,421 9.83% 2,091,161
Mega VANGUARD CAPITAL MANAGEMENT LLC $7,827,229 6.13% 1,303,452
Mega CITADEL ADVISORS LLC $7,669,934 6.00% 1,277,258
Mega D. E. Shaw & Co., Inc. $7,294,735 5.71% 1,214,777
Mega BlackRock, Inc. $6,730,913 5.27% 1,120,885
Mega JPMORGAN CHASE & CO $6,443,803 5.04% 1,073,073
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP $4,490,539 3.52% 747,800
Large Alyeska Investment Group, L.P. $4,335,610 3.39% 722,000
Large LMR Partners LLP $4,147,665 3.25% 690,702
Mega GEODE CAPITAL MANAGEMENT, LLC $3,959,624 3.10% 659,388
Micro Vennlight Capital Management, LP $3,455,871 2.71% 575,499
Mega CITADEL ADVISORS LLC $3,375,410 2.64% 562,100
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP $3,290,740 2.58% 548,000
Mid WINTON GROUP Ltd $2,980,281 2.33% 496,300
Mega UBS Group AG $2,963,929 2.32% 493,577
Large Hudson Bay Capital Management LP $2,715,983 2.13% 452,287
Large Verition Fund Management LLC $2,671,972 2.09% 444,958
Mega JANE STREET GROUP, LLC $2,471,658 1.94% 411,600
Large RENAISSANCE TECHNOLOGIES LLC $2,449,439 1.92% 407,900
Mega GOLDMAN SACHS GROUP INC $2,379,409 1.86% 396,238
Mega STATE STREET CORP $2,074,847 1.62% 345,520
Mega CHARLES SCHWAB INVESTMENT MANAGEMENT INC $2,029,635 1.59% 337,991
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP $1,983,307 1.55% 330,276
Small Creek Drive Management Group LLC $1,981,650 1.55% 330,000
Mega VANGUARD FIDUCIARY TRUST CO Bank $1,803,944 1.41% 300,407
Mega MORGAN STANLEY $1,714,720 1.34% 285,549
Mid Magnetar Financial LLC $1,465,220 1.15% 244,000
Mid HITE Hedge Asset Management LLC $1,441,878 1.13% 240,113
Large TORONTO DOMINION BANK Bank $1,356,973 1.06% 225,974
Large Balyasny Asset Management L.P. $1,236,447 0.97% 205,903
Large Squarepoint Ops LLC $1,040,120 0.81% 173,209
Mega BANK OF AMERICA CORP /DE/ Bank $797,163 0.62% 132,750
Mega CITADEL ADVISORS LLC $755,429 0.59% 125,800
Mega NORTHERN TRUST CORP Bank $747,844 0.59% 124,537
Small Harraden Circle Investments, LLC $732,610 0.57% 122,000
Small Yorkville Advisors Global, LP $732,610 0.57% 122,000
Small Periscope Capital Inc. $732,610 0.57% 122,000
Mid Shay Capital LLC $709,106 0.56% 118,086
Large COMMONWEALTH EQUITY SERVICES, LLC $601,286 0.47% 100,131
Large DANSKE BANK A/S Bank $600,500 0.47% 100,000
Mid SONA ASSET MANAGEMENT (US) LLC $513,822 0.40% 85,566
Small K2 PRINCIPAL FUND, L.P. $480,400 0.38% 80,000
Small TIEMANN INVESTMENT ADVISORS, LLC $456,349 0.36% 75,995
Mid MOORE CAPITAL MANAGEMENT, LP $450,375 0.35% 75,000
Mega JANE STREET GROUP, LLC $447,972 0.35% 74,600
Small FNY Investment Advisers, LLC $397,290 0.31% 66,160
Small Massar Capital Management, LP $390,325 0.31% 65,000
Mega UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC $381,317 0.30% 63,500
Mid CastleKnight Management LP $364,503 0.29% 60,700
Small Diametric Capital, LP $355,441 0.28% 59,191
Mega Swiss National Bank Bank $339,883 0.27% 56,600
Small Mount Lucas Management LP $309,257 0.24% 51,500
Small MMCAP International Inc. SPC $265,895 0.21% 44,279
Micro Stoic Point Capital Management LLC $252,210 0.20% 42,000
Small SIMON QUICK ADVISORS, LLC $240,200 0.19% 40,000
Mid BLUEFIN CAPITAL MANAGEMENT, LLC $194,940 0.15% 32,463
Large CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM Pension $187,812 0.15% 31,276
Mega Vanguard Global Advisers, LLC $162,465 0.13% 27,055
Mega CITIGROUP INC $161,582 0.13% 26,908
Mega LPL Financial LLC $160,357 0.13% 26,704
Large MARSHALL WACE, LLP $157,792 0.12% 26,277
Mega ROYAL BANK OF CANADA Bank $153,853 0.12% 25,621
Mid Brevan Howard Capital Management LP $151,043 0.12% 25,153
Mid DRW Securities, LLC Broker-Dealer $132,110 0.10% 22,000
Small FLOW TRADERS U.S. LLC $129,287 0.10% 21,530
Mid IMC-Chicago, LLC $127,047 0.10% 21,157
Mid Advisory Services Network, LLC $125,714 0.10% 20,935
Mega VANGUARD ASSET MANAGEMENT, Ltd $116,815 0.09% 19,453
Large Schonfeld Strategic Advisors LLC $115,620 0.09% 19,254
Small T3 Companies, LLC $105,688 0.08% 17,600
Mega Bank of New York Mellon Corp Bank $102,295 0.08% 17,035
Mid LEVEL FOUR ADVISORY SERVICES, LLC $98,331 0.08% 16,375
Small T3 Companies, LLC $97,851 0.08% 16,295
Small FLAX POND CAPITAL, LLC $96,080 0.08% 16,000
Mega Legal & General Group Plc $91,450 0.07% 15,229
Mid PRELUDE CAPITAL MANAGEMENT, LLC $75,777 0.06% 12,619
Mega BANK OF MONTREAL /CAN/ Bank $75,182 0.06% 12,520
Large TUDOR INVESTMENT CORP ET AL $67,580 0.05% 11,254
Large Vanguard Investments Australia, Ltd. $64,097 0.05% 10,674
Small WealthPlan Investment Management, LLC $61,287 0.05% 10,206
Small INSIGNEO ADVISORY SERVICES, LLC $60,050 0.05% 10,000
Mid FIRST FOUNDATION ADVISORS Endowment $60,050 0.05% 10,000
Large JONES FINANCIAL COMPANIES LLLP $51,961 0.04% 8,653
Large NATIONAL BANK OF CANADA /FI/ Bank $45,037 0.04% 7,500
Large KLP KAPITALFORVALTNING AS $37,831 0.03% 6,300
Large Federation des caisses Desjardins du Quebec $32,126 0.03% 5,350
Large OSAIC HOLDINGS, INC. $15,186 0.01% 2,529
Small Anchor Investment Management, LLC $12,610 0.01% 2,100
Micro Cherry Tree Wealth Management, LLC $4,155 0.00% 692
Mid Farther Finance Advisors, LLC $1,489 0.00% 248
Large Steward Partners Investment Advisory, LLC $1,201 0.00% 200
Micro DB Fitzpatrick & Co, Inc $900 0.00% 150
Mid Tower Research Capital LLC (TRC) $618 0.00% 103
Micro Redwood Park Advisors LLC $522 0.00% 87
Micro Signature Resources Capital Management, LLC $420 0.00% 70
Small Root Financial Partners, LLC $300 0.00% 50
Small CoreCap Advisors, LLC $42 0.00% 7
Key facts CIK 2019804 CUSIP 881454102 Visit website Investor relations

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