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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
PEAK6
101
PEAK6
Illinois
– -$553K -41,389 Closed
MA
102
MYDA Advisors
New York
– -$492K -30,000 Closed
NFG
103
Nations Financial Group
Iowa
– -$444K -27,047 Closed
PAG
104
Private Advisor Group
New Jersey
– -$375K -22,841 Closed
TCM
105
Tuttle Capital Management
Connecticut
– -$287K -17,500 Closed
EFI
106
EHP Funds Inc
Canada
– -$228K -13,895 Closed
MS
107
Maven Securities
Jersey
– -$200K -12,200 Closed
Raymond James Financial
108
Raymond James Financial
Florida
– -$177K -10,809 Closed
BNP Paribas Financial Markets
109
BNP Paribas Financial Markets
France
– -$164K -10,000 Closed
NC
110
North Capital
Utah
– -$164K -10,000 Closed
SIA
111
Soltis Investment Advisors
Utah
– -$164K -10,000 Closed
Group One Trading
112
Group One Trading
Illinois
– -$7.7K -576 Closed
LFG
113
Larson Financial Group
Missouri
– -$1.71K -104 Closed
KHC
114
Koesten Hirschmann & Crabtree
Kansas
– -$821 -50 Closed
RPA
115
Redwood Park Advisors
California
– -$588 -44 Closed
WANY
116
Wealthspire Advisors (New York)
New York
– -$329 -20 Closed
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.