Terrestrial Energy
IMSR
108 hedge funds and large institutions have $151M invested in Terrestrial Energy in 2026 Q2 according to their latest regulatory filings, with 38 funds opening new positions, 28 increasing their positions, 22 reducing their positions, and 16 closing their positions.
138% more first-time investments, than exits
New positions opened: 38 | Existing positions closed: 16
36% more capital invested
Capital invested by funds: $111M → $151M (+$40M)
34% more call options, than puts
Call options by funds: $19.4M | Put options by funds: $14.5M
27% more repeat investments, than reductions
Existing positions increased: 28 | Existing positions reduced: 22
23% more funds holding
Funds holding: 88 → 108 (+20)
2.47% less ownership
Funds ownership: 22.8% → 20.33% (-2.5%)
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Vanguard Capital Management
Malvern,
Pennsylvania
|
+$15.6M |
| 2 |
UBS Group
Zurich,
Switzerland
|
+$9.45M |
| 3 |
HF
HRT Financial
New York
|
+$8.32M |
| 4 |
Pacer Advisors
Malvern,
Pennsylvania
|
+$4.25M |
| 5 |
HCM
Highbridge Capital Management
New York
|
+$1.8M |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Citadel Advisors
Miami,
Florida
|
-$9.37M |
| 2 |
D.E. Shaw & Co
New York
|
-$4.04M |
| 3 |
Alyeska Investment Group
Chicago,
Illinois
|
-$3.7M |
| 4 |
Goldman Sachs
New York
|
-$2.49M |
| 5 |
Renaissance Technologies
New York
|
-$1.66M |
IMSR Hedge Fund Activity: Q2 2026 in Review
108 of the 8,318 institutional investors tracked by Wall St. Rank reported a position in Terrestrial Energy (IMSR) for Q2 2026, worth a combined $151M — up 36% from $111M a quarter earlier.
Buyers outnumbered sellers: 38 funds opened new IMSR positions and 16 closed out — a net gain of 22 holders — while 28 added to existing stakes and 22 trimmed.
The largest buyer was Vanguard Capital Management, adding an estimated $15.6M. The largest seller was Citadel Advisors, cutting an estimated $9.37M.
- 108 institutional investors held Terrestrial Energy (IMSR) as of Q2 2026, up from 88 in Q1 2026.
- Funds reported $151M of Terrestrial Energy stock for Q2 2026, up 36% quarter-over-quarter.
- 38 funds opened new Terrestrial Energy positions in Q2 2026 and 16 closed out, a net change of +22 holders.
- The largest Terrestrial Energy buyer in Q2 2026 was Vanguard Capital Management, an estimated $15.6M added.
- The largest Terrestrial Energy seller in Q2 2026 was Citadel Advisors, an estimated $9.37M sold.
Based on aggregated 13F filings for Q2 2026.