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IMSR

Terrestrial Energy
IMSR

65 hedge funds and large institutions have $210M invested in Terrestrial Energy in 2025 Q2 according to their latest regulatory filings, with 29 funds opening new positions, 7 increasing their positions, 23 reducing their positions, and 9 closing their positions.

New
Increased
Maintained
Reduced
Closed

222% more first-time investments, than exits

New positions opened: 29 | Existing positions closed: 9

44% more funds holding

Funds holding: 45 → 65 (+20)

2% less capital invested

Capital invested by funds: $213M → $210M (-$3.8M)

6.29% less ownership

Funds ownership: 88.01% → 81.72% (-6.3%)

70% less repeat investments, than reductions

Existing positions increased: 7 | Existing positions reduced: 23

Holders
65
Holders Change
+20
Holders Change %
+44.44%
% of All Funds
0.86%
Holding in Top 10
2
Holding in Top 10 Change
+2
Holding in Top 10 Change %
% of All Funds
0.03%
New
29
Increased
7
Reduced
23
Closed
9
Calls
$360K
Puts
–
Net Calls
+$360K
Net Calls Change
+$360K

Top Buyers

Rank Fund Capital Flow
1
VCM
Vennlight Capital Management
Connecticut
+$11.4M
2
ACM
Arosa Capital Management
Florida
+$6.23M
3
SC
Shay Capital
New York
+$6.1M
4
Balyasny Asset Management
Balyasny Asset Management
Illinois
+$5.34M
5
CF
Cantor Fitzgerald
New York
+$5.19M

Top Sellers

Rank Fund Capital Flow
1
AA
AQR Arbitrage
Connecticut
-$13.6M
2
ECA
Encompass Capital Advisors
New York
-$10M
3
PMAM
Picton Mahoney Asset Management
Ontario, Canada
-$9.32M
4
FTCM
First Trust Capital Management
Illinois
-$7.54M
5
MF
Magnetar Financial
Illinois
-$6.25M
Name Holding Trade Value Shares
Change 		Change in
Stake
LA
1
Linden Advisors
New York
$21.6M -$556K -50,000 -3%
MF
2
Magnetar Financial
Illinois
$16.5M -$6.25M -562,032 -29%
FTCM
3
First Trust Capital Management
Illinois
$11.7M -$7.54M -677,828 -39%
VCM
4
Vennlight Capital Management
Connecticut
$11.4M +$11.4M +1,027,934 New
D.E. Shaw & Co
5
D.E. Shaw & Co
New York
$10.8M – – –
MI
6
MMCAP International
Cayman Islands
$10.7M -$199K -17,932 -2%
PMAM
7
Picton Mahoney Asset Management
Ontario, Canada
$10.5M -$9.32M -837,919 -47%
LP
8
LMR Partners
United Kingdom
$10.4M -$5.23M -470,402 -33%
ACM
9
Arosa Capital Management
Florida
$6.22M +$6.23M +560,000 New
SC
10
Shay Capital
New York
$6.09M +$6.1M +548,258 New
Balyasny Asset Management
11
Balyasny Asset Management
Illinois
$6.05M +$5.34M +479,894 +738%
Calamos Advisors
12
Calamos Advisors
Illinois
$5.55M – – –
DAM
13
DLD Asset Management
New York
$5.2M +$2.66M +239,189 +104%
CF
14
Cantor Fitzgerald
New York
$5.18M +$5.19M +466,287 New
Goldman Sachs
15
Goldman Sachs
New York
$4.83M -$2.04M -183,701 -30%
COPPSERS
16
Commonwealth of Pennsylvania Public School Employees Retirement System
Pennsylvania
$4.51M – – –
RCM
17
Rivernorth Capital Management
Florida
$4.44M – – –
WRBC
18
W.R. Berkley Corp
Connecticut
$4.42M +$1.12M +100,781 +34%
SIG
19
Senator Investment Group
New York
$3.77M +$3.78M +340,000 New
WA
20
Whitebox Advisors
Minnesota
$3.54M -$902K -81,086 -20%
GL
21
Governors Lane
New York
$3.33M +$3.34M +300,000 New
MA
22
MYDA Advisors
New York
$3.33M +$3.34M +300,000 New
PAMP
23
Polar Asset Management Partners
Ontario, Canada
$2.86M -$1.1M -98,538 -28%
PEAK6
24
PEAK6
Illinois
$2.81M +$2.82M +253,361 New
HF
25
HRT Financial
New York
$2.55M +$1.45M +130,749 +132%
1
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IMSR Hedge Fund Activity: Q2 2025 in Review

65 of the 7,596 institutional investors tracked by Wall St. Rank reported a position in Terrestrial Energy (IMSR) for Q2 2025, worth a combined $210M — down 1.8% from $213M a quarter earlier.

Buyers outnumbered sellers: 29 funds opened new IMSR positions and 9 closed out — a net gain of 20 holders — while 7 added to existing stakes and 23 trimmed.

The largest buyer was Vennlight Capital Management, opening a new position worth an estimated $11.4M. The largest seller was AQR Arbitrage, exiting entirely with an estimated $13.6M sold.

  • 65 institutional investors held Terrestrial Energy (IMSR) as of Q2 2025, up from 45 in Q1 2025.
  • Funds reported $210M of Terrestrial Energy stock for Q2 2025, down 1.8% quarter-over-quarter.
  • 29 funds opened new Terrestrial Energy positions in Q2 2025 and 9 closed out, a net change of +20 holders.
  • The largest Terrestrial Energy buyer in Q2 2025 was Vennlight Capital Management, an estimated $11.4M added.
  • The largest Terrestrial Energy seller in Q2 2025 was AQR Arbitrage, an estimated $13.6M sold.

Based on aggregated 13F filings for Q2 2025.