Dimensional Fund Advisors
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Dimensional Fund Advisors’s Perma-Fix Environmental Services PESI Stock Holding History

Dimensional Fund Advisors’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 		$1.75M Sell
163,787
-1,000
-0.6% -$13.7K ﹤0.01% 2733
2025
Q4 		$2.08M Buy
164,787
+7,934
+5% +$101K ﹤0.01% 2733
2025
Q3 		$1.58M Buy
156,853
+4,478
+3% +$49.5K ﹤0.01% 2819
2025
Q2 		$1.6M Buy
152,375
+28,413
+23% +$261K ﹤0.01% 2813
2025
Q1 		$902K Buy
123,962
+12,343
+11% +$111K ﹤0.01% 2900
2024
Q4 		$1.24M Buy
111,619
+22,633
+25% +$298K ﹤0.01% 2881
2024
Q3 		$1.09M Buy
88,986
+10,480
+13% +$112K ﹤0.01% 2895
2024
Q2 		$795K Buy
78,506
+13,949
+22% +$155K ﹤0.01% 2945
2024
Q1 		$768K Sell
64,557
-4,305
-6% -$37.2K ﹤0.01% 2962
2023
Q4 		$541K Sell
68,862
-7,785
-10% -$65.8K ﹤0.01% 3032
2023
Q3 		$801K Buy
76,647
+2,100
+3% +$23.1K ﹤0.01% 2965
2023
Q2 		$819K Buy
74,547
+7,095
+11% +$74K ﹤0.01% 2958
2023
Q1 		$795K Buy
67,452
+2,849
+4% +$18.5K ﹤0.01% 2952
2022
Q4 		$229 Hold
64,603
– – ﹤0.01% 3203
2022
Q3 		$290K Sell
64,603
-1,114
-2% -$5.72K ﹤0.01% 3170
2022
Q2 		$341K Sell
65,717
-1,601
-2% -$8.88K ﹤0.01% 3154
2022
Q1 		$372K Hold
67,318
– – ﹤0.01% 3210
2021
Q4 		$426K Hold
67,318
– – ﹤0.01% 3203
2021
Q3 		$448K Buy
67,318
+88
+0.1% +$540 ﹤0.01% 3210
2021
Q2 		$481K Hold
67,230
– – ﹤0.01% 3168
2021
Q1 		$493K Buy
67,230
+1,900
+3% +$12.9K ﹤0.01% 3144
2020
Q4 		$390K Buy
65,330
+8
+0% +$52 ﹤0.01% 3135
2020
Q3 		$461K Hold
65,322
– – ﹤0.01% 3077
2020
Q2 		$417K Buy
65,322
+7,875
+14% +$45.6K ﹤0.01% 3110
2020
Q1 		$299K Buy
57,447
+4,701
+9% +$33.3K ﹤0.01% 3148
2019
Q4 		$480K Buy
52,746
+4,001
+8% +$25.3K ﹤0.01% 3138
2019
Q3 		$221K Hold
48,745
– – ﹤0.01% 3268
2019
Q2 		$191K Hold
48,745
– – ﹤0.01% 3327
2019
Q1 		$171K Hold
48,745
– – ﹤0.01% 3329
2018
Q4 		$115K Hold
48,745
– – ﹤0.01% 3351
2018
Q3 		$205K Buy
48,745
+3,100
+7% +$14.2K ﹤0.01% 3307
2018
Q2 		$205K Buy
45,645
+2,400
+6% +$10.9K ﹤0.01% 3249
2018
Q1 		$179K Buy
43,245
+5,634
+15% +$21.9K ﹤0.01% 3240
2017
Q4 		$137K Buy
37,611
+2,600
+7% +$9.87K ﹤0.01% 3258
2017
Q3 		$133K Buy
35,011
+12,507
+56% +$45.8K ﹤0.01% 3253
2017
Q2 		$83K Hold
22,504
– – ﹤0.01% 3268
2017
Q1 		$71K Hold
22,504
– – ﹤0.01% 3266
2016
Q4 		$88K Hold
22,504
– – ﹤0.01% 3251
2016
Q3 		$113K Hold
22,504
– – ﹤0.01% 3223
2016
Q2 		$115K Buy
22,504
+1,994
+10% +$8.72K ﹤0.01% 3227
2016
Q1 		$76K Hold
20,510
– – ﹤0.01% 3248
2015
Q4 		$77K Hold
20,510
– – ﹤0.01% 3277
2015
Q3 		$83K Hold
20,510
– – ﹤0.01% 3315
2015
Q2 		$78K Buy
20,510
+5,075
+33% +$18.6K ﹤0.01% 3317
2015
Q1 		$60K Buy
+15,435
New +$65.3K ﹤0.01% 3302

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

Dimensional Fund Advisors's PESI Position: Q1 2026 in Review

Dimensional Fund Advisors reduced its Perma-Fix Environmental Services (PESI) stake by 0.61% in Q1 2026, selling an estimated $13.7K and leaving 163,787 shares worth $1.75M. The position accounts for ﹤0.01% of the portfolio, ranked #2733.

Dimensional Fund Advisors first reported a position in PESI in Q1 2015 and has held it in 45 quarters since. The position peaked at $2.08M in Q4 2025. 85 funds tracked by Wall St. Rank hold PESI as of Q1 2026.

  • Dimensional Fund Advisors held 163,787 shares of Perma-Fix Environmental Services worth $1.75M as of Q1 2026.
  • Dimensional Fund Advisors sold 1,000 Perma-Fix Environmental Services shares in Q1 2026, an estimated $13.7K.
  • Perma-Fix Environmental Services made up ﹤0.01% of Dimensional Fund Advisors's portfolio in Q1 2026, its #2733 holding.
  • Dimensional Fund Advisors first reported a position in Perma-Fix Environmental Services in Q1 2015 and has held it in 45 quarters since.
  • Dimensional Fund Advisors's Perma-Fix Environmental Services position peaked at $2.08M in Q4 2025.
  • 85 funds tracked by Wall St. Rank held Perma-Fix Environmental Services as of Q1 2026.

Based on Dimensional Fund Advisors's 13F filing for Q1 2026, filed 7 May 2026.