Terrestrial Energy
IMSR
45 hedge funds and large institutions have $213M invested in Terrestrial Energy in 2025 Q1 according to their latest regulatory filings, with 18 funds opening new positions, 3 increasing their positions, 15 reducing their positions, and 8 closing their positions.
125% more first-time investments, than exits
New positions opened: 18 | Existing positions closed: 8
32% more capital invested
Capital invested by funds: $162M → $213M (+$51.1M)
29% more funds holding
Funds holding: 35 → 45 (+10)
17.65% more ownership
Funds ownership: 70.36% → 88.01% (+18%)
80% less repeat investments, than reductions
Existing positions increased: 3 | Existing positions reduced: 15
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
LA
Linden Advisors
New York
|
+$20.3M |
| 2 |
MF
Magnetar Financial
Evanston,
Illinois
|
+$19.9M |
| 3 |
MI
MMCAP International
Grand Cayman,
Cayman Islands
|
+$9.94M |
| 4 |
ECA
Encompass Capital Advisors
New York
|
+$9.6M |
| 5 |
Calamos Advisors
Naperville,
Illinois
|
+$5.07M |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
KIM
Karpus Investment Management
Pittsford,
New York
|
-$13M |
| 2 |
WAM
Wolverine Asset Management
Chicago,
Illinois
|
-$5.19M |
| 3 |
HCM
Highbridge Capital Management
New York
|
-$5.01M |
| 4 |
FTCM
First Trust Capital Management
Chicago,
Illinois
|
-$3.46M |
| 5 |
AA
AQR Arbitrage
Greenwich,
Connecticut
|
-$2.79M |
IMSR Hedge Fund Activity: Q1 2025 in Review
45 of the 7,459 institutional investors tracked by Wall St. Rank reported a position in Terrestrial Energy (IMSR) for Q1 2025, worth a combined $213M — up 32% from $162M a quarter earlier.
Buyers outnumbered sellers: 18 funds opened new IMSR positions and 8 closed out — a net gain of 10 holders — while 3 added to existing stakes and 15 trimmed.
The largest buyer was Linden Advisors, opening a new position worth an estimated $20.3M. The largest seller was Karpus Investment Management, exiting entirely with an estimated $13M sold.
- 45 institutional investors held Terrestrial Energy (IMSR) as of Q1 2025, up from 35 in Q4 2024.
- Funds reported $213M of Terrestrial Energy stock for Q1 2025, up 32% quarter-over-quarter.
- 18 funds opened new Terrestrial Energy positions in Q1 2025 and 8 closed out, a net change of +10 holders.
- The largest Terrestrial Energy buyer in Q1 2025 was Linden Advisors, an estimated $20.3M added.
- The largest Terrestrial Energy seller in Q1 2025 was Karpus Investment Management, an estimated $13M sold.
Based on aggregated 13F filings for Q1 2025.