13F Insight
DOSSIER · 13F Holders · Q1 2026Cheap mega-capRe-rated
PESI

PERMA-FIX ENVIRONMENTAL SVCS

90 institutions still hold PERMA-FIX ENVIRONMENTAL SVCS as of Q1 2026. Tracked across SEC 13F-HR filings, with insider and 13D/G activity surfaced alongside.

CUSIP 714157203·90 13F holders·last filed Mar 31, 2026
Market cap
—
▲ 4.2%
vs prior quarter
13F value held
$76M
56.0% inst. owned
of float
Holders
90
+20 QoQ
filers reporting
Activity
+80 / −7
+982 added · −881 reduced
this quarter
Concentration
16.41%
BlackRock, Inc. #1
top holder share
AI Holders Summary · Q1 2026

90 institutions reported PESI in Q1 2026. BlackRock, Inc. leads at 16.4% of the visible book. +20 net new institutions vs prior quarter — accumulation reading.

Top holders

Sorted by position value. Source: SEC EDGAR 13F-HR filings.

#HolderValueShares% port.Quarter
01
BlackRock, Inc.
CIK 0002012383
$13M1.2M0.00%Q1 202602
MAK CAPITAL ONE LLC
CIK 0001385702
$10M919K1.45%Q1 202603
PRESCOTT GROUP CAPITAL MANAGEMENT, L.L.C.
CIK 0001166152
$8M777K0.83%Q1 202604
VANGUARD CAPITAL MANAGEMENT LLC
CIK 0002100119· Index
$8M759K0.00%Q1 202605
HEARTLAND ADVISORS INC
CIK 0000937394
$5M400K0.27%Q4 202506
GEODE CAPITAL MANAGEMENT, LLC
CIK 0001214717· Index
$5M433K0.00%Q1 202607
DIAMOND HILL CAPITAL MANAGEMENT INC
CIK 0001217541
$4M356K0.02%Q1 202608
STATE STREET CORP
CIK 0000093751
$4M336K0.00%Q1 202609
Potomac Capital Management, Inc.
CIK 0001418746
$3M297K2.76%Q1 202610
GROUP ONE TRADING LLC
CIK 0000932540
$3M248K0.01%Q1 202611
PERRITT CAPITAL MANAGEMENT INC
CIK 0001279342
$2M166K3.50%Q4 202512
DIMENSIONAL FUND ADVISORS LP
CIK 0000354204· Quasi-passive
$2M164K0.00%Q1 202613
SUSQUEHANNA INTERNATIONAL GROUP, LLP
CIK 0001446194· Market maker
$2M162K0.00%Q1 202614
GOLDMAN SACHS GROUP INC
CIK 0000886982
$2M143K0.00%Q1 202615
NORTHERN TRUST CORP
CIK 0000073124· Index
$1M130K0.00%Q1 202616
North Star Investment Management Corp.
CIK 0001342857
$1M121K0.08%Q1 202617
MYDA Advisors LLC
CIK 0001589689
$1M120K0.21%Q1 202618
VANGUARD FIDUCIARY TRUST CO
CIK 0000933478· Index
$1M119K0.00%Q1 202619
D. E. Shaw & Co., Inc.
CIK 0001009207
$1M96K0.00%Q4 202520
Vanguard Portfolio Management
CIK 0002100121
$1M100K0.00%Q1 2026
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