Ken Griffin
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Ken Griffin’s Perma-Fix Environmental Services PESI Stock Holding History

Ken Griffin’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 		$741K Buy
69,313
+33,184
+92% +$456K ﹤0.01% 8386
2025
Q4 		$455K Sell
36,129
-24,035
-40% -$306K ﹤0.01% 9253
2025
Q3 		$608K Buy
60,164
+29,691
+97% +$328K ﹤0.01% 8644
2025
Q2 		$321K Sell
30,473
-82,430
-73% -$758K ﹤0.01% 9654
2025
Q1 		$821K Buy
112,903
+112,640
+42,829% +$1.01M ﹤0.01% 7385
2024
Q4 		$2.91K Sell
263
-13,293
-98% -$175K ﹤0.01% 14042
2024
Q3 		$166K Buy
13,556
+7,646
+129% +$81.8K ﹤0.01% 10424
2024
Q2 		$59.9K Sell
5,910
-19,513
-77% -$216K ﹤0.01% 11563
2024
Q1 		$302K Sell
25,423
-16,413
-39% -$142K ﹤0.01% 9437
2023
Q4 		$329K Sell
41,836
-1,707
-4% -$14.4K ﹤0.01% 8987
2023
Q3 		$455K Buy
43,543
+31,324
+256% +$345K ﹤0.01% 8258
2023
Q2 		$134K Buy
12,219
+6,276
+106% +$65.4K ﹤0.01% 10496
2023
Q1 		$70K Sell
5,943
-22,938
-79% -$149K ﹤0.01% 11730
2022
Q4 		$102K Buy
+28,881
New +$111K ﹤0.01% 11190
2019
Q2 		– Sell
-19,225
Closed -$67K – 9687
2019
Q1 		$67K Buy
+19,225
New +$63.9K ﹤0.01% 8712
2018
Q1 		– Sell
-20,305
Closed -$74K – 8650
2017
Q4 		$74K Buy
+20,305
New +$77.1K ﹤0.01% 7519
2017
Q2 		– Sell
-13,052
Closed -$41K – 7907
2017
Q1 		$41K Buy
+13,052
New +$43.3K ﹤0.01% 7095
2013
Q4 		– Sell
-3,930
Closed -$14K – 7122
2013
Q3 		$14K Buy
+3,930
New +$9.94K ﹤0.01% 6369

Other funds holding PESI

BlackRock
BlackRock New York $6.73T AUM 46.02% 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 $1.16B AUM 53.61% 1-Year Est. Return
VCM
Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return
HA
Heartland Advisors Milwaukee, Wisconsin $2.25B AUM 44.61% 1-Year Est. Return
Diamond Hill Capital Management
Diamond Hill Capital Management Columbus, Ohio $12.5B AUM 7.49% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 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

Ken Griffin's PESI Position: Q1 2026 in Review

Ken Griffin increased its Perma-Fix Environmental Services (PESI) stake by 92% in Q1 2026, buying an estimated $456K and bringing the position to 69,313 shares worth $741K. The position accounts for ﹤0.01% of the portfolio, ranked #8386.

Ken Griffin first reported a position in PESI in Q3 2013 and has held it in 18 quarters since. The position peaked at $821K in Q1 2025. 85 funds tracked by Wall St. Rank hold PESI as of Q1 2026.

  • Ken Griffin held 69,313 shares of Perma-Fix Environmental Services worth $741K as of Q1 2026.
  • Ken Griffin bought 33,184 Perma-Fix Environmental Services shares in Q1 2026, an estimated $456K.
  • Perma-Fix Environmental Services made up ﹤0.01% of Ken Griffin's portfolio in Q1 2026, its #8386 holding.
  • Ken Griffin first reported a position in Perma-Fix Environmental Services in Q3 2013 and has held it in 18 quarters since.
  • Ken Griffin's Perma-Fix Environmental Services position peaked at $821K in Q1 2025.
  • 85 funds tracked by Wall St. Rank held Perma-Fix Environmental Services as of Q1 2026.

Based on Citadel Advisors's 13F filing for Q1 2026, filed 15 May 2026.