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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
DCM
76
Davidson Capital Management
Texas
$1.11K +$2.43K +182 New
FHA
77
Flagship Harbor Advisors
Massachusetts
$855 +$1.87K +140 New
Fidelity Investments
78
Fidelity Investments
Massachusetts
$611 +$1.34K +100 New
DFC
79
DB Fitzpatrick & Co
Idaho
$428 +$936 +70 New
RFP
80
Root Financial Partners
California
$306 +$668 +50 New
TCM
81
Triumph Capital Management
Colorado
$275 +$602 +45 New
CA
82
CoreCap Advisors
Michigan
$43 -$13.3K -993 -99%
VCM
83
Vennlight Capital Management
Connecticut
– -$6.68M -500,000 Closed
DKCM
84
Davidson Kempner Capital Management
New York
– -$4.44M -270,540 Closed
SG
85
Sourcerock Group
Colorado
– -$4.23M -257,900 Closed
SCM
86
SIR Capital Management
New York
– -$3.57M -217,600 Closed
LA
87
Linden Advisors
New York
– -$3.44M -209,426 Closed
HF
88
HRT Financial
New York
– -$2.74M -204,611 Closed
WCA
89
Waratah Capital Advisors
Ontario, Canada
– -$3.25M -198,188 Closed
WRBC
90
W.R. Berkley Corp
Connecticut
– -$2.64M -160,672 Closed
WA
91
Whitebox Advisors
Minnesota
– -$1.89M -115,000 Closed
BCM
92
BlueCrest Capital Management
Jersey
– -$1.82M -110,644 Closed
WC
93
Wexford Capital
Florida
– -$1.69M -102,712 Closed
HHAM
94
HITE Hedge Asset Management
Massachusetts
– -$1.68M -102,338 Closed
DAM
95
Deltec Asset Management
New York
– -$1.23M -75,000 Closed
ACM
96
Arosa Capital Management
Florida
– -$1.07M -65,000 Closed
JG
97
Jain Global
New York
– -$1.04M -63,363 Closed
BFM
98
Boothbay Fund Management
New York
– -$963K -58,698 Closed
Simplex Trading
99
Simplex Trading
Illinois
– -$649K -48,514 Closed
PMAM
100
Picton Mahoney Asset Management
Ontario, Canada
– -$691K -42,081 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.