PESI · Perma Fix Environmental Services Inc · Holdings

$18.77 +0.52 (+2.85%) At close · Sep 11

Russell 2000 member Rebalance outlook locked

Market Cap

$398.27M

21.22M

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

Use institutional holdings through the 13F API or MCP →

Quarter:

Holders: 88

Total Value: $136,856,805

Total Shares: 9,577,107

Institutional Ownership Trend

26 quarters

Holder Concentration

Across 88 13F filers · Δ vs Mar 31, 2026

Top Holder

13.1%

−2.0 pts

Top 5

47.2%

−5.0 pts

Top 10

71.1%

−2.0 pts

HHI

622

Broadly held−90

Quarterly Activity

vs Mar 31, 2026

New

Increased

Decreased

Sold Out

Unchanged

Holder count: +3

Institutional value: +64.4%

Shares held: +23.0%

Top Buyers

vs Mar 31, 2026

Institution	Added	Now Holds
Large DIAMOND HILL CAPITAL MANAGEMENT INC	+286,555	642,533
Small Potomac Capital Management, Inc.	+180,300	477,000
Small MAK CAPITAL ONE LLC	+114,285	1,032,958
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP	+88,136	249,734
Mega BlackRock, Inc.	+82,453	1,252,756

Top Sellers

vs Mar 31, 2026

Institution	Sold	Now Holds
Mid GROUP ONE TRADING LLC	−125,063	122,611
Mega D. E. Shaw & Co., Inc.	−38,131	24,858
Mega JANE STREET GROUP, LLC	−32,874	46,651
Mega UBS Group AG	−30,589	31,493
Small MYDA Advisors LLC	−30,000	90,000

Top New Positions

vs Mar 31, 2026

Institution	Acquired	Value (USD)
Mid KENNEDY CAPITAL MANAGEMENT LLC	610,903	$8,729,803
Small Diametric Capital, LP	114,714	$1,639,263
Small CM WEALTH ADVISORS LLC	87,839	$1,255,219
Small Owls Nest Partners IA, LLC	56,555	$808,170
Large SEI INVESTMENTS CO	41,022	$586,204

Top Sold-Out Positions

vs Mar 31, 2026

Institution	Previously Held	Last Value (USD)
Mid GSA CAPITAL PARTNERS LLP	16,097	$172,076
Small Fermata Advisors, LLC	12,936	$138,285
Small Greenhaven Road Investment Management, L.P.	11,303	$120,829
Mega Invesco Ltd.	11,135	$119,031
Mega AMERICAN CENTURY COMPANIES INC	10,692	$114,297

Filter: New 14 Increased 33 Reduced 18 Sold out 11 Unchanged 23

Showing 91 of 91

All Common Calls Puts

Compact Export CSV

Holder

Value (USD)

% of 13F

BlackRock, Inc.

$17,901,881

13.08%

1,252,756

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
BLACKROCK FINANCIAL MANAGEMENT INC/DE	9,947	$142,142	0.8%	Sole
BlackRock Investment Management, LLC	54,780	$782,806	4.4%	Sole
BLACKROCK ADVISORS LLC	35,363	$505,337	2.8%	Sole
BlackRock Fund Advisors	688,775	$9,842,594	55.0%	Sole
BlackRock Institutional Trust Company, N.A.	463,891	$6,629,002	37.0%	Sole

MAK CAPITAL ONE LLC

$14,760,969

10.79%

1,032,958

VANGUARD CAPITAL MANAGEMENT LLC

$11,599,807

8.48%

811,743

Prescott Group Capital Management, L.L.C.

$11,105,359

8.11%

777,142

DIAMOND HILL CAPITAL MANAGEMENT INC

$9,181,796

6.71%

642,533

KENNEDY CAPITAL MANAGEMENT LLC

$8,729,803

6.38%

610,903

Potomac Capital Management, Inc.

$6,816,330

4.98%

477,000

GEODE CAPITAL MANAGEMENT, LLC

$6,504,179

4.75%

455,156

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
GEODE CAPITAL MANAGEMENT TRUST COMPANY, LLC	65,080	$929,993	14.3%	Defined
Held directly	390,076	$5,574,186	85.7%	Defined

HEARTLAND ADVISORS INC

$5,716,000

4.18%

400,000

STATE STREET CORP

$4,997,841

3.65%

349,744

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
STATE STREET GLOBAL ADVISORS EUROPE LIMITED joint	349,744	$4,997,841	100.0%	Defined

DIMENSIONAL FUND ADVISORS LP

$2,730,288

1.99%

191,063

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Dimensional Fund Advisors Ltd.	1,441	$20,591	0.8%	Defined
DFA Australia Ltd.	1,316	$18,805	0.7%	Defined
Dimensional Ireland Ltd	11,069	$158,176	5.8%	Defined
Held directly	177,237	$2,532,716	92.8%	Sole

GOLDMAN SACHS GROUP INC

$2,325,768

1.70%

162,755

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
GOLDMAN SACHS & CO. LLC	138,650	$1,981,308	85.2%	Defined
GOLDMAN SACHS ASSET MANAGEMENT, L.P.	24,105	$344,460	14.8%	Defined

SUSQUEHANNA INTERNATIONAL GROUP, LLP

$2,242,586

1.64%

156,934

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
SUSQUEHANNA SECURITIES, LLC	156,934	$2,242,586	100.0%	Other

CITADEL ADVISORS LLC

$2,181,025

1.59%

152,626

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Citadel Securities GP LLC	39,960	$571,028	26.2%	Defined
Held directly	112,666	$1,609,997	73.8%	Defined

NORTHERN TRUST CORP

$2,024,020

1.48%

141,639

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
NORTHERN TRUST CO joint	139,162	$1,988,624	98.3%	Defined
DWS INVESTMENT MANAGEMENT AMERICAS, INC joint	2,477	$35,396	1.7%	Other

VANGUARD FIDUCIARY TRUST CO

$1,758,241

1.28%

123,040

GROUP ONE TRADING LLC

$1,752,111

1.28%

122,611

VANGUARD PORTFOLIO MANAGEMENT LLC

$1,732,905

1.27%

121,267

North Star Investment Management Corp.

$1,722,402

1.26%

120,532

Diametric Capital, LP

$1,639,263

1.20%

114,714

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Thakore Nainoor	114,714	$1,639,263	100.0%	Defined

MYDA Advisors LLC

$1,286,100

0.94%

90,000

CM WEALTH ADVISORS LLC

$1,255,219

0.92%

87,839

XTX Topco Ltd

$898,669

0.66%

62,888

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
XTX EXECUTION SERVICES LLC joint	62,888	$898,669	100.0%	Defined

SUSQUEHANNA INTERNATIONAL GROUP, LLP

$878,835

0.64%

61,500

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
SUSQUEHANNA SECURITIES, LLC	61,500	$878,835	100.0%	Other

Owls Nest Partners IA, LLC

$808,170

0.59%

56,555

Pale Fire Capital SE

$794,909

0.58%

55,627

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Barta Jan joint	55,627	$794,909	100.0%	Defined

MORGAN STANLEY

$758,567

0.55%

53,084

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
MORGAN STANLEY & CO INTERNATIONAL PLC	82	$1,171	0.2%	Defined
MORGAN STANLEY & CO. LLC	4,910	$70,163	9.2%	Defined
MORGAN STANLEY CAPITAL SERVICES, LLC	20,495	$292,873	38.6%	Defined
MORGAN STANLEY SMITH BARNEY LLC	5,998	$85,711	11.3%	Defined
PARAMETRIC PORTFOLIO ASSOCIATES LLC	21,599	$308,649	40.7%	Defined

JANE STREET GROUP, LLC

$666,642

0.49%

46,651

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Jane Street Capital, LLC	46,651	$666,642	100.0%	Defined

CHARLES SCHWAB INVESTMENT MANAGEMENT INC

$646,608

0.47%

45,249

GatePass Capital, LLC

$639,363

0.47%

44,742

CORSAIR CAPITAL MANAGEMENT, L.P.

$609,454

0.45%

42,649

BANK OF AMERICA CORP /DE/

$591,191

0.43%

41,371

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
BANK OF AMERICA NA	41,371	$591,191	100.0%	Defined

SEI INVESTMENTS CO

$586,204

0.43%

41,022

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
SEI TRUST CO	41,022	$586,204	100.0%	Sole

Bank of New York Mellon Corp

$544,461

0.40%

38,101

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Mellon Investments Corporation	11,860	$169,479	31.1%	Defined
The Bank of New York Mellon	26,096	$372,911	68.5%	Defined
BNY Mellon, NA	143	$2,043	0.4%	Defined
Held directly	2	$28	0.0%	Defined

ALLIANCEBERNSTEIN L.P.

$469,426

0.34%

32,850

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Equitable Holdings, Inc.	32,850	$469,426	100.0%	Defined

SIMPLEX TRADING, LLC

$452,035

0.33%

31,633

UBS Group AG

$450,034

0.33%

31,493

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
UBS AG	31,493	$450,034	100.0%	Defined

SUSQUEHANNA INTERNATIONAL GROUP, LLP

$447,277

0.33%

31,300

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
SUSQUEHANNA SECURITIES, LLC	31,300	$447,277	100.0%	Other

Squarepoint Ops LLC

$442,647

0.32%

30,976

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Squarepoint Capital LLP	30,976	$442,647	100.0%	Defined

WELLS FARGO & COMPANY/MN

$418,739

0.31%

29,303

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
WELLS FARGO BANK N A	15,903	$227,253	54.3%	Defined
WELLS FARGO CLEARING SERVICES, LLC	13,400	$191,486	45.7%	Defined

D. E. Shaw & Co., Inc.

$355,220

0.26%

24,858

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
D. E. SHAW & CO, L.P.	24,858	$355,220	100.0%	Defined

BROWN ADVISORY INC

$333,428

0.24%

23,333

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Brown Advisory LLC	23,333	$333,428	100.0%	Defined

Nuveen, LLC

$320,867

0.23%

22,454

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
TEACHERS ADVISORS, LLC joint	22,454	$320,867	100.0%	Defined

Trexquant Investment LP

$313,636

0.23%

21,948

RHUMBLINE ADVISERS

$298,360

0.22%

20,879

Rothschild Wealth LLC

$294,374

0.22%

20,600

Quadrature Capital Ltd

$271,038

0.20%

18,967

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Quadrature US Inc.	18,967	$271,038	100.0%	Other

FIFTH LANE CAPITAL, LP

$257,220

0.19%

18,000

BAILARD, INC.

$254,362

0.19%

17,800

Oxler Private Wealth LLC

$243,001

0.18%

17,005

GUIDANCE CAPITAL, INC

$238,400

0.17%

16,683

IMC-Chicago, LLC

$235,284

0.17%

16,465

Quent Capital, LLC

$231,483

0.17%

16,199

OSAIC HOLDINGS, INC.

$227,211

0.17%

15,900

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
OSAIC WEALTH, INC.	400	$5,716	2.5%	Defined
CW Advisors, LLC	15,500	$221,495	97.5%	Sole

DEUTSCHE BANK AG\

$219,579

0.16%

15,366

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
DWS INVESTMENT MANAGEMENT AMERICAS, INC	315	$4,501	2.0%	Defined
DWS Investments UK Ltd	15,051	$215,078	98.0%	Defined

CITADEL ADVISORS LLC

$197,202

0.14%

13,800

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Citadel Securities GP LLC	13,800	$197,202	100.0%	Defined

PRICE T ROWE ASSOCIATES INC /MD/

$166,921

0.12%

11,681

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
T. Rowe Price International Ltd	11,681	$166,921	100.0%	Defined

Vident Advisory, LLC

$148,473

0.11%

10,390

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Acuitas Investments, LLC	10,390	$148,473	100.0%	Defined

MetLife Investment Management, LLC

$134,468

0.10%

9,410

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
METLIFE INC	9,410	$134,468	100.0%	Defined

Russell Investments Group, Ltd.

$124,765

0.09%

8,731

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Russell Investment Management, LLC	8,731	$124,765	100.0%	Defined

CITIGROUP INC

$117,734

0.09%

8,239

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Citigroup Financial Products Inc. joint	8,239	$117,734	100.0%	Defined

MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.

$115,963

0.08%

8,115

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Global X Management CO LLC joint	8,115	$115,963	100.0%	Defined

JPMORGAN CHASE & CO

$106,730

0.08%

7,469

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
JPMorgan Chase Bank, N.A.	7,306	$104,402	97.8%	Defined
J.P. Morgan Investment Management Inc.	50	$714	0.7%	Defined
J.P. Morgan Securities plc	113	$1,614	1.5%	Defined

Vanguard Global Advisers, LLC

$82,053

0.06%

5,742

Police & Firemen's Retirement System of New Jersey

$80,724

0.06%

5,649

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Mellon Capital	5,649	$80,724	100.0%	Defined

Capital Advisors, Ltd. LLC

$71,450

0.05%

5,000

NEW YORK STATE COMMON RETIREMENT FUND

$62,876

0.05%

4,400

FMR LLC

$59,745

0.04%

4,181

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Fidelity Management & Research Co LLC	4,171	$59,603	99.8%	Defined
STRATEGIC ADVISERS LLC	10	$142	0.2%	Defined

Persistent Asset Partners Ltd

$55,902

0.04%

3,912

BARCLAYS PLC

$38,697

0.03%

2,708

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
BARCLAYS BANK PLC	2,273	$32,481	83.9%	Defined
BARCLAYS CAPITAL INC.	435	$6,216	16.1%	Defined

BNP PARIBAS ARBITRAGE, SA

$35,467

0.03%

2,482

Tower Research Capital LLC (TRC)

$25,493

0.02%

1,784

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Latour Trading LLC (Latour)	1,784	$25,493	100.0%	Defined

Legal & General Group Plc

$22,263

0.02%

1,558

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Legal & General Investment Management America Inc	1,558	$22,263	100.0%	Defined

Ameritas Investment Partners, Inc.

$17,605

0.01%

1,232

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
EATON VANCE MANAGEMENT	1,232	$17,605	100.0%	Other

Global Retirement Partners, LLC

$10,631

0.01%

744

ROYAL BANK OF CANADA

$8,273

0.01%

579

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
RBC CMA LTD.	529	$7,559	91.4%	Defined
RBC Capital Markets, LLC	50	$714	8.6%	Defined

CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM

$3,472

0.00%

243

GAMMA Investing LLC

$3,058

0.00%

214

Sterling Capital Management LLC

$1,443

0.00%

101

Arax Advisory Partners

$1,286

0.00%

NISA INVESTMENT ADVISORS, LLC

$1,014

0.00%

Torren Management, LLC

$757

0.00%

Caitong International Asset Management Co., Ltd

$685

0.00%

EverSource Wealth Advisors, LLC

$457

0.00%

ROTHSCHILD INVESTMENT LLC

$285

0.00%

Essential Partners LLC

$128

0.00%

CoreCap Advisors, LLC

$71

0.00%

Allworth Financial LP

$71

0.00%

Optiver Holding B.V.

$28

0.00%

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Optiver VOF	2	$28	100.0%	Defined

MORGAN DEMPSEY CAPITAL MANAGEMENT LLC

$14

0.00%

SBI Securities Co., Ltd.

$14

0.00%

Key facts CIK 891532 CUSIP 714157203 13F (30d) 41 filings 41 filers Visit website Investor relations