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IMSR · Terrestrial Energy Inc. /DE/

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$5.57 +0.30 (+5.69%) At close · Aug 21
Market Cap
$590.06M
Shares
105.94M

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: 122
Total Value: $174,094,164
Total Shares: 35,905,195

Institutional Ownership Trend

4 quarters

Holder Concentration

Across 122 13F filers · Δ vs Mar 31, 2026
Top Holder
13.9%
Sep 2025 → Jun 2026 · range 0.0% – 13.9%
+4.0 pts
Top 5
41.5%
Sep 2025 → Jun 2026 · range 0.0% – 41.5%
+2.7 pts
Top 10
58.8%
Sep 2025 → Jun 2026 · range 0.0% – 58.9%
−0.2 pts
HHI
510
Sep 2025 → Jun 2026 · range 0 – 510
Broadly held+50

Quarterly Activity

vs Mar 31, 2026
New
36
Increased
34
Decreased
31
Sold Out
21
Unchanged
21
Holder count: +15
Institutional value: +37.0%
Shares held: +10.8%

Top Buyers

vs Mar 31, 2026
Institution Added Now Holds Open
VANGUARD CAPITAL MANAGEMENT LLC +2,110,744 3,414,196
UBS Group AG +1,278,596 1,772,173
Caption Management, LLC +384,300 1,249,672
BOOTHBAY FUND MANAGEMENT, LLC +231,000 621,000
JANE STREET GROUP, LLC +229,819 716,019

Top Sellers

vs Mar 31, 2026
Institution Sold Now Holds Open
CITADEL ADVISORS LLC −1,159,197 805,961
D. E. Shaw & Co., Inc. −546,809 667,968
Alyeska Investment Group, L.P. −500,000 222,000
GOLDMAN SACHS GROUP INC −336,813 59,425
RENAISSANCE TECHNOLOGIES LLC −224,100 183,800

Top New Positions

vs Mar 31, 2026
Institution Acquired Value (USD) Open
HRT FINANCIAL LP 1,125,849 $7,971,010
Pacer Advisors, Inc. 574,618 $4,068,295
Parallax Volatility Advisers, L.P. 328,518 $2,325,907
HIGHBRIDGE CAPITAL MANAGEMENT LLC 244,000 $1,727,520
XTX Topco Ltd 94,601 $669,775

Top Sold-Out Positions

vs Mar 31, 2026
Institution Previously Held Last Value (USD) Open
HITE Hedge Asset Management LLC 240,113 $1,441,878
K2 PRINCIPAL FUND, L.P. 80,000 $480,400
Massar Capital Management, LP 65,000 $390,325
Diametric Capital, LP 59,191 $355,441
BLUEFIN CAPITAL MANAGEMENT, LLC 32,463 $194,940
Filter: New 36 Increased 34 Reduced 31 Sold out 21 Unchanged 21
Showing 100 of 142
All Common Calls Puts
Export CSV
Holder Value (USD) % of 13F Shares Open
VANGUARD CAPITAL MANAGEMENT LLC $24,172,507 13.88% 3,414,196
EXCHANGE TRADED CONCEPTS, LLC $15,293,323 8.78% 2,160,074
UBS Group AG $12,546,984 7.21% 1,772,173
HRT FINANCIAL LP $7,971,010 4.58% 1,125,849
BlackRock, Inc. $7,607,628 4.37% 1,074,524
JPMORGAN CHASE & CO $6,844,922 3.93% 966,797
GEODE CAPITAL MANAGEMENT, LLC $4,913,052 2.82% 693,934
LMR Partners LLP $4,890,170 2.81% 690,702
SUSQUEHANNA INTERNATIONAL GROUP, LLP $4,767,672 2.74% 673,400
D. E. Shaw & Co., Inc. $4,729,212 2.72% 667,968
Hudson Bay Capital Management LP $4,172,194 2.40% 589,293
CITADEL ADVISORS LLC $4,138,968 2.38% 584,600
Pacer Advisors, Inc. $4,068,295 2.34% 574,618
SUSQUEHANNA INTERNATIONAL GROUP, LLP $4,048,570 2.33% 571,832
WINTON GROUP Ltd $3,568,320 2.05% 504,000
SUSQUEHANNA INTERNATIONAL GROUP, LLP $3,379,992 1.94% 477,400
MORGAN STANLEY $2,922,729 1.68% 412,815
Caption Management, LLC $2,720,844 1.56% 384,300
Verition Fund Management LLC $2,654,702 1.52% 374,958
VANGUARD FIDUCIARY TRUST CO $2,589,665 1.49% 365,772
Vennlight Capital Management, LP $2,499,310 1.44% 353,010
STATE STREET CORP $2,454,607 1.41% 346,696
CHARLES SCHWAB INVESTMENT MANAGEMENT INC $2,361,880 1.36% 333,599
JANE STREET GROUP, LLC $2,203,296 1.27% 311,200
Parallax Volatility Advisers, L.P. $1,840,800 1.06% 260,000
HIGHBRIDGE CAPITAL MANAGEMENT LLC $1,727,520 0.99% 244,000
Magnetar Financial LLC $1,727,520 0.99% 244,000
JANE STREET GROUP, LLC $1,704,290 0.98% 240,719
Alyeska Investment Group, L.P. $1,571,760 0.90% 222,000
CITADEL ADVISORS LLC $1,496,004 0.86% 211,300
RENAISSANCE TECHNOLOGIES LLC $1,301,304 0.75% 183,800
Creek Drive Management Group LLC $1,239,000 0.71% 175,000
CastleKnight Management LP $1,171,032 0.67% 165,400
JANE STREET GROUP, LLC $1,161,828 0.67% 164,100
FNY Investment Advisers, LLC $1,073,682 0.62% 151,650
Shay Capital LLC $952,536 0.55% 134,539
NORTHERN TRUST CORP $895,896 0.51% 126,539
Yorkville Advisors Global, LP $863,760 0.50% 122,000
Periscope Capital Inc. $863,760 0.50% 122,000
Harraden Circle Investments, LLC $863,760 0.50% 122,000
COMMONWEALTH EQUITY SERVICES, LLC $784,421 0.45% 110,794
TORONTO DOMINION BANK $778,800 0.45% 110,000
MILLENNIUM MANAGEMENT LLC $679,927 0.39% 96,035
XTX Topco Ltd $669,775 0.38% 94,601
Mount Lucas Management LP $658,440 0.38% 93,000
Aquatic Capital Management LLC $629,780 0.36% 88,952
SONA ASSET MANAGEMENT (US) LLC $605,806 0.35% 85,566
Squarepoint Ops LLC $605,340 0.35% 85,500
VOLORIDGE INVESTMENT MANAGEMENT, LLC $590,287 0.34% 83,374
Engineers Gate Manager LP $582,648 0.33% 82,295
TIEMANN INVESTMENT ADVISORS, LLC $538,044 0.31% 75,995
MOORE CAPITAL MANAGEMENT, LP $531,000 0.31% 75,000
IMC-Chicago, LLC $530,936 0.30% 74,991
Parallax Volatility Advisers, L.P. $485,107 0.28% 68,518
AQR CAPITAL MANAGEMENT LLC $423,218 0.24% 59,777
GOLDMAN SACHS GROUP INC $420,729 0.24% 59,425
Swiss National Bank $400,728 0.23% 56,600
Balyasny Asset Management L.P. $399,743 0.23% 56,461
ALLSTATE CORP $355,451 0.20% 50,205
MMCAP International Inc. SPC $313,495 0.18% 44,279
LPL Financial LLC $300,057 0.17% 42,381
TUDOR INVESTMENT CORP ET AL $298,953 0.17% 42,225
ExodusPoint Capital Management, LP $284,651 0.16% 40,205
SIMON QUICK ADVISORS, LLC $283,200 0.16% 40,000
Y-Intercept (Hong Kong) Ltd $270,102 0.16% 38,150
CANADA PENSION PLAN INVESTMENT BOARD $205,320 0.12% 29,000
AMERICAN CENTURY COMPANIES INC $189,517 0.11% 26,768
UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC $186,904 0.11% 26,399
BANK OF AMERICA CORP /DE/ $180,051 0.10% 25,431
PRELUDE CAPITAL MANAGEMENT, LLC $177,000 0.10% 25,000
Advisory Services Network, LLC $173,849 0.10% 24,555
DRW Securities, LLC $155,760 0.09% 22,000
Legal & General Group Plc $152,481 0.09% 21,537
SLT Holdings LLC $148,680 0.09% 21,000
Foundations Investment Advisors, LLC $148,680 0.09% 21,000
MARSHALL WACE, LLP $143,568 0.08% 20,278
Shay Capital LLC $141,600 0.08% 20,000
Vanguard Global Advisers, LLC $141,338 0.08% 19,963
VANGUARD ASSET MANAGEMENT, Ltd $137,727 0.08% 19,453
JONES FINANCIAL COMPANIES LLLP $123,064 0.07% 17,382
Zurcher Kantonalbank (Zurich Cantonalbank) $121,018 0.07% 17,093
Bank of New York Mellon Corp $119,729 0.07% 16,911
BANK OF MONTREAL /CAN/ $116,600 0.07% 16,469
FLAX POND CAPITAL, LLC $113,280 0.07% 16,000
Valeo Financial Advisors, LLC $106,200 0.06% 15,000
DNB Asset Management AS $80,924 0.05% 11,430
Vanguard Investments Australia, Ltd. $75,571 0.04% 10,674
CITADEL ADVISORS LLC $71,231 0.04% 10,061
Cornerstone Advisory, LLC $70,821 0.04% 10,003
FIRST FOUNDATION ADVISORS $70,800 0.04% 10,000
INSIGNEO ADVISORY SERVICES, LLC $70,800 0.04% 10,000
Rockefeller Capital Management L.P. $49,560 0.03% 7,000
Federation des caisses Desjardins du Quebec $45,666 0.03% 6,450
KLP KAPITALFORVALTNING AS $44,604 0.03% 6,300
US BANCORP \DE\ $31,860 0.02% 4,500
ROYAL BANK OF CANADA $23,597 0.01% 3,333
OSAIC HOLDINGS, INC. $19,377 0.01% 2,737
NATIONAL BANK OF CANADA /FI/ $14,152 0.01% 1,999
CITIGROUP INC $10,690 0.01% 1,510
FMR LLC $9,204 0.01% 1,300
Key facts CIK 2019804 CUSIP 881454102 13F (30d) 116 filings 116 filers Visit website Investor relations

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