Perma-Fix Environmental Services
PESI
88 hedge funds and large institutions have $135M invested in Perma-Fix Environmental Services in 2026 Q2 according to their latest regulatory filings, with 14 funds opening new positions, 34 increasing their positions, 17 reducing their positions, and 9 closing their positions.
100% more funds holding in top 10
Funds holding in top 10: 1 → 2 (+1)
100% more repeat investments, than reductions
Existing positions increased: 34 | Existing positions reduced: 17
67% more capital invested
Capital invested by funds: $80.9M → $135M (+$54.3M)
56% more first-time investments, than exits
New positions opened: 14 | Existing positions closed: 9
3.86% more ownership
Funds ownership: 40.81% → 44.66% (+3.9%)
4% more funds holding
Funds holding: 85 → 88 (+3)
4% more call options, than puts
Call options by funds: $1.14M | Put options by funds: $1.09M
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
KCM
Kennedy Capital Management
St Louis,
Missouri
|
+$6.81M |
| 2 |
Diamond Hill Capital Management
Columbus,
Ohio
|
+$3.19M |
| 3 |
PCM
Potomac Capital Management
New York
|
+$2.01M |
| 4 |
Susquehanna International Group
Bala Cynwyd,
Pennsylvania
|
+$1.63M |
| 5 |
DC
Diametric Capital
Boston,
Massachusetts
|
+$1.28M |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Group One Trading
Chicago,
Illinois
|
-$1.39M |
| 2 |
D.E. Shaw & Co
New York
|
-$425K |
| 3 |
UBS Group
Zurich,
Switzerland
|
-$341K |
| 4 |
MA
MYDA Advisors
Woodmere,
New York
|
-$334K |
| 5 |
Squarepoint
New York
|
-$234K |
PESI Hedge Fund Activity: Q2 2026 in Review
88 of the 8,351 institutional investors tracked by Wall St. Rank reported a position in Perma-Fix Environmental Services (PESI) for Q2 2026, worth a combined $135M — up 67% from $80.9M a quarter earlier.
Buyers outnumbered sellers: 14 funds opened new PESI positions and 9 closed out — a net gain of 5 holders — while 34 added to existing stakes and 17 trimmed.
The largest buyer was Kennedy Capital Management, opening a new position worth an estimated $6.81M. The largest seller was Group One Trading, cutting an estimated $1.39M.
- 88 institutional investors held Perma-Fix Environmental Services (PESI) as of Q2 2026, up from 85 in Q1 2026.
- Funds reported $135M of Perma-Fix Environmental Services stock for Q2 2026, up 67% quarter-over-quarter.
- 14 funds opened new Perma-Fix Environmental Services positions in Q2 2026 and 9 closed out, a net change of +5 holders.
- The largest Perma-Fix Environmental Services buyer in Q2 2026 was Kennedy Capital Management, an estimated $6.81M added.
- The largest Perma-Fix Environmental Services seller in Q2 2026 was Group One Trading, an estimated $1.39M sold.
Based on aggregated 13F filings for Q2 2026.