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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
DB
26
Danske Bank
Denmark
$1.3M +$2.85M +213,401 New
Walleye Capital
27
Walleye Capital
New York
$1.29M +$2.82M +210,581 New
Renaissance Technologies
28
Renaissance Technologies
New York
$1.06M +$2.31M +172,800 New
Northern Trust
29
Northern Trust
Illinois
$955K +$2.09M +156,377 New
Morgan Stanley
30
Morgan Stanley
New York
$747K +$680K +50,887 +71%
HCI
31
Harraden Circle Investments
New York
$745K +$1.63M +122,000 New
SAMU
32
SONA Asset Management (US)
New York
$611K – – –
XT
33
XTX Topco
Cayman Islands
$594K +$1.3M +97,218 New
PC
34
Periscope Capital
Ontario, Canada
$581K +$1.63M +122,000 New
FIA
35
FNY Investment Advisers
New York
$549K +$956K +71,480 +386%
Squarepoint
36
Squarepoint
New York
$545K +$1.19M +89,207 New
SIA
37
SkyView Investment Advisors
New Jersey
$512K +$1.12M +83,844 New
JF
38
Jump Financial
Illinois
$476K +$1.04M +77,900 New
TIA
39
Tiemann Investment Advisors
California
$464K +$1.02M +75,995 New
Bank of America
40
Bank of America
North Carolina
$414K +$537K +40,177 +146%
MCM
41
Massar Capital Management
Connecticut
$397K – – –
CM
42
CastleKnight Management
New York
$371K +$251K +18,800 +45%
Two Sigma Investments
43
Two Sigma Investments
New York
$353K +$772K +57,712 New
Commonwealth Equity Services
44
Commonwealth Equity Services
Massachusetts
$330K +$287K +21,452 +66%
EGM
45
Engineers Gate Manager
New York
$316K +$691K +51,654 New
MCM
46
Moore Capital Management
New York
$306K -$1.67M -125,000 -71%
Barclays
47
Barclays
United Kingdom
$277K +$605K +45,275 New
SQA
48
Simon Quick Advisors
New Jersey
$275K +$602K +45,000 New
MLM
49
Mount Lucas Management
Pennsylvania
$244K +$535K +40,000 New
Royal Bank of Canada
50
Royal Bank of Canada
Ontario, Canada
$202K +$347K +25,992 +371%
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.