Simplex Trading
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Simplex Trading’s Perma-Fix Environmental Services PESI Stock Holding History

Simplex Trading’s Portfolio PESI Stock Details PESI Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q1 		$140K Buy
+13,100
New +$180K ﹤0.01% 4708
2025
Q4 		– Sell
-8,400
Closed -$84K – 9700
2025
Q3 		$84K Buy
8,400
+200
+2% +$2.21K ﹤0.01% 5945
2025
Q2 		$86K Sell
8,200
-5,700
-41% -$52.4K ﹤0.01% 5391
2025
Q1 		$101K Buy
13,900
+7,400
+114% +$66.5K ﹤0.01% 5047
2024
Q4 		$71K Buy
+6,500
New +$85.5K ﹤0.01% 5511
2023
Q2 		– Sell
-9,300
Closed -$109K – 9698
2023
Q1 		$109K Buy
+9,300
New +$60.5K ﹤0.01% 5061
2020
Q2 		– Sell
-15
Closed -$7K – 8162
2020
Q1 		$7K Buy
+15
New +$106 ﹤0.01% 6681

Other funds holding PESI

BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
MCO
MAK Capital One New York $679M AUM 29.02% 1-Year Est. Return
PGCM
Prescott Group Capital Management Tulsa, Oklahoma $1B AUM 51.95% 1-Year Est. Return
VCM
Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return
HA
Heartland Advisors Milwaukee, Wisconsin $1.96B AUM 28.26% 1-Year Est. Return
Diamond Hill Capital Management
Diamond Hill Capital Management Columbus, Ohio $16B AUM 4.15% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return
PCM
Potomac Capital Management New York $115M AUM
Group One Trading
Group One Trading Chicago, Illinois $52.2B AUM 104.56% 1-Year Est. Return

Simplex Trading's PESI Position: Q1 2026 in Review

Simplex Trading opened a new position in Perma-Fix Environmental Services (PESI) in Q1 2026: 31,318 shares worth $335K. The stake represents ﹤0.01% of the portfolio and ranks #3699 among its holdings. This is a return to the name: Simplex Trading previously reported a position in PESI as recently as Q3 2025.

Simplex Trading first reported a position in PESI in Q1 2018 and has held it in 13 quarters since. 85 funds tracked by Wall St. Rank hold PESI as of Q1 2026.

  • Simplex Trading held 31,318 shares of Perma-Fix Environmental Services worth $335K as of Q1 2026.
  • Perma-Fix Environmental Services was a new Simplex Trading position in Q1 2026.
  • Perma-Fix Environmental Services made up ﹤0.01% of Simplex Trading's portfolio in Q1 2026, its #3699 holding.
  • Simplex Trading first reported a position in Perma-Fix Environmental Services in Q1 2018 and has held it in 13 quarters since.
  • 85 funds tracked by Wall St. Rank held Perma-Fix Environmental Services as of Q1 2026.

Based on Simplex Trading's 13F filing for Q1 2026, filed 14 May 2026.