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IMSR

Terrestrial Energy
IMSR

82 hedge funds and large institutions have $131M invested in Terrestrial Energy in 2025 Q4 according to their latest regulatory filings, with 50 funds opening new positions, 19 increasing their positions, 9 reducing their positions, and 34 closing their positions.

New
Increased
Maintained
Reduced
Closed

250% more call options, than puts

Call options by funds: $22.1M | Put options by funds: $6.33M

111% more repeat investments, than reductions

Existing positions increased: 19 | Existing positions reduced: 9

47% more first-time investments, than exits

New positions opened: 50 | Existing positions closed: 34

24% more funds holding

Funds holding: 66 → 82 (+16)

16.87% less ownership

Funds ownership: 43.06% → 26.19% (-17%)

20% less capital invested

Capital invested by funds: $163M → $131M (-$31.8M)

100% less funds holding in top 10

Funds holding in top 10: 1 → 0 (-1)

Holders
82
Holders Change
+16
Holders Change %
+24.24%
% of All Funds
1%
Holding in Top 10
–
Holding in Top 10 Change
-1
Holding in Top 10 Change %
-100%
% of All Funds
–
New
50
Increased
19
Reduced
9
Closed
34
Calls
$22.1M
Puts
$6.33M
Net Calls
+$15.8M
Net Calls Change
+$9.87M

Top Buyers

Rank Fund Capital Flow
1
Vanguard Group
Vanguard Group
Pennsylvania
+$24.7M
2
JP Morgan Chase
JP Morgan Chase
New York
+$14.9M
3
BlackRock
BlackRock
New York
+$14.6M
4
Citadel Advisors
Citadel Advisors
Florida
+$13.4M
5
SIG
Senator Investment Group
New York
+$12M

Top Sellers

Rank Fund Capital Flow
1
Millennium Management
Millennium Management
New York
-$7.99M
2
VCM
Vennlight Capital Management
Connecticut
-$6.68M
3
DKCM
Davidson Kempner Capital Management
New York
-$4.44M
4
SG
Sourcerock Group
Colorado
-$4.23M
5
SCM
SIR Capital Management
New York
-$3.57M
Name Holding Trade Value Shares
Change 		Change in
Stake
Millennium Management
51
Millennium Management
New York
$193K -$7.99M -597,705 -95%
Marshall Wace
52
Marshall Wace
United Kingdom
$189K +$413K +30,893 New
TC
53
T3 Companies
New York
$174K +$381K +28,500 New
BHCM
54
Brevan Howard Capital Management
Jersey
$161K +$353K +26,400 New
LIP
55
Lighthouse Investment Partners
Florida
$161K +$352K +26,340 New
Toronto Dominion Bank
56
Toronto Dominion Bank
Ontario, Canada
$153K +$334K +25,000 New
MF
57
Magnetar Financial
Illinois
$152K -$1.57M -117,419 -83%
VF
58
Virtu Financial
New York
$133K +$290K +21,688 New
SSA
59
Schonfeld Strategic Advisors
New York
$109K +$238K +17,828 New
LCM
60
Landscape Capital Management
New Jersey
$105K +$229K +17,121 New
National Bank of Canada
61
National Bank of Canada
Quebec, Canada
$104K +$4.04K +302 +2%
AGM
62
Alpine Global Management
New York
$99.3K -$174K -13,048 -45%
Citigroup
63
Citigroup
New York
$75.3K +$165K +12,319 New
MG
64
Marex Group
$73.3K +$160K +12,000 New
SSG
65
Summit Securities Group
New York
$70.3K +$154K +11,500 New
Grantham, Mayo, Van Otterloo & Co (GMO)
66
Grantham, Mayo, Van Otterloo & Co (GMO)
Massachusetts
$70.1K +$153K +11,475 New
FDCDDQ
67
Federation des caisses Desjardins du Quebec
Quebec, Canada
$26.6K -$12K -900 -17%
Osaic Holdings
68
Osaic Holdings
Arizona
$14.9K +$28.4K +2,121 +684%
AIM
69
Anchor Investment Management
South Carolina
$12.8K – – –
TRCT
70
Tower Research Capital (TRC)
New York
$10.3K +$22.5K +1,680 New
ACM
71
Aster Capital Management
United Arab Emirates
$8.19K +$17.9K +1,340 New
CTWM
72
Cherry Tree Wealth Management
Minnesota
$4.23K +$9.25K +692 New
TAM
73
Tucker Asset Management
Colorado
$2.27K +$4.96K +371 New
FFA
74
Farther Finance Advisors
California
$1.51K +$3.31K +248 New
SPIA
75
Steward Partners Investment Advisory
New York
$1.22K – – –
1 2
3
4 5

IMSR Hedge Fund Activity: Q4 2025 in Review

82 of the 8,223 institutional investors tracked by Wall St. Rank reported a position in Terrestrial Energy (IMSR) for Q4 2025, worth a combined $131M — down 20% from $163M a quarter earlier.

Buyers outnumbered sellers: 50 funds opened new IMSR positions and 34 closed out — a net gain of 16 holders — while 19 added to existing stakes and 9 trimmed.

The largest buyer was Vanguard Group, opening a new position worth an estimated $24.7M. The largest seller was Millennium Management, cutting an estimated $7.99M.

  • 82 institutional investors held Terrestrial Energy (IMSR) as of Q4 2025, up from 66 in Q3 2025.
  • Funds reported $131M of Terrestrial Energy stock for Q4 2025, down 20% quarter-over-quarter.
  • 50 funds opened new Terrestrial Energy positions in Q4 2025 and 34 closed out, a net change of +16 holders.
  • The largest Terrestrial Energy buyer in Q4 2025 was Vanguard Group, an estimated $24.7M added.
  • The largest Terrestrial Energy seller in Q4 2025 was Millennium Management, an estimated $7.99M sold.

Based on aggregated 13F filings for Q4 2025.