Perma-Fix Environmental Services

PESI • NASDAQ

Perma-Fix Environmental Services is a waste management company in the industrials sector on NASDAQ, led by Mark Duff, with a market cap of $260.9M. As of Q3 2025, 40% of shares are held by 76 institutional investors, with BlackRock, Inc. as the largest holder at 6.32%.

CEOMark Duff

Market Cap$260.9M

Waste Management

Industrials

Employees297.0

Websiteperma-fix.com

Country

United States of America

Overview

Overview of institutional ownership in PESI as of Q3 2025 with a market cap of $186.5M

All Institutions

Institutions: 76
Value Held: $74.4M
Shares Held: 7.4M
Avg Position: $978.4K
Median Position: $163.3K

Hedge Funds

Hedge Funds: 8
Value Held: $17.7M
Shares Held: 1.8M
Avg Position: $2.2M
Median Position: $354.0K

Ownership Breakdown

Institutional (non-HF)

30.37%

$56.7M

Hedge Funds

9.49%

$17.7M

Retail & Other

60.14%

$112.2M

Based on market cap of $186.5M as of Q3 2025. Institutional (non-HF) excludes hedge funds to avoid double counting.

Biggest Investors

Institutions with the largest positions in PESI as of Q3 2025

Institution	Key People	Position Value	Ownership	Owned Since	Total AUM (Long)
B BlackRock, Inc. Institution	-	$11.8M 0.00% of portfolio	6.32% 1.2M shares	Q1 2017 Held for 8y 8m	$5.67T
VANGUARD GROUP INC Institution	Salim Ramji CEO	$9.5M 0.00% of portfolio	5.07% 935.9K shares	≤ Q2 2013 Held for 12y 5m+	$6.69T
MAK CAPITAL ONE LLC Hedge Fund•Multi-Strategy	Michael Anthony Kaufman CIO	$8.2M 1.64% of portfolio	4.42% 815.6K shares	Q2 2025 Held for 5 months	$501.3M
P PRESCOTT GROUP CAPITAL MANAGEMENT, L.L.C. Hedge Fund•Long/Short	Matthew Nicholas Dunham President	$7.8M 0.83% of portfolio	4.21% 777.1K shares	Q4 2023 Held for 1y 11m	$948.6M
H HEARTLAND ADVISORS INC Long Only Manager	William Richard Nasgovitz CEO	$4.6M 0.24% of portfolio	2.48% 458.3K shares	≤ Q2 2013 Held for 12y 5m+	$1.9B
GEODE CAPITAL MANAGEMENT LLC ETF Provider	David Kenneth Lane CEO	$4.3M 0.00% of portfolio	2.28% 421.2K shares	≤ Q2 2013 Held for 12y 5m+	$1.57T
DIAMOND HILL CAPITAL MANAGEMENT INC Long Only Manager	Heather Brilliant CEO	$4.1M 0.02% of portfolio	2.17% 401.6K shares	Q3 2024 Held for 1y 2m	$21.0B
STATE STREET CORP Institution	Ronald P. O'Hanley CEO	$3.0M 0.00% of portfolio	1.62% 298.4K shares	Q2 2021 Held for 4y 5m	$2.88T
VAN ECK ASSOCIATES CORP ETF Provider	Jan Frederick Vaneck CEO	$2.2M 0.00% of portfolio	1.19% 220.3K shares	Q2 2024 Held for 1y 5m	$96.6B
ESSEX INVESTMENT MANAGEMENT CO LLC Long Only Manager	Nancy Beth Prial CEO	$2.0M 0.30% of portfolio	1.06% 196.2K shares	Q3 2023 Held for 2y 2m	$652.5M

Net Capital Flow

Institutional buying and selling activity for PESI in Q3 2025

Traded: +$8.0M
Buyers: 43
Sellers: 26
Total Bought: +$12.9M
Total Sold: −$4.9M
Avg Position: $895.9K

Biggest Buyers

Institution	Net Bought	Current Position
MAK CAPITAL ONE LLC Hedge Fund•Multi-Strategy	+$7.3M +723.0K shares	$8.2M 815.6K shares
GOLDMAN SACHS GROUP INC Institution	+$649.0K +64.3K shares	$649.0K 64.3K shares
VAN ECK ASSOCIATES CORP ETF Provider	+$479.7K +47.5K shares	$2.2M 220.3K shares
D D. E. Shaw & Co., Inc. Institution	+$467.7K +46.3K shares	$467.7K 46.3K shares
Trexquant Investment LP Hedge Fund•Quant	+$425.8K +42.2K shares	$425.8K 42.2K shares
BANK OF AMERICA CORP /DE/ Institution	+$391.5K +38.8K shares	$482.2K 47.7K shares
J JANE STREET GROUP, LLC Institution	+$365.0K +36.1K shares	$587.8K 58.2K shares
A Advisor Group Holdings, Inc. Institution	+$340.9K +33.8K shares	$362.5K 35.9K shares
MORGAN STANLEY RIA/Wealth	+$309.2K +30.6K shares	$1.0M 99.6K shares
CITADEL ADVISORS LLC Hedge Fund•Multi-Strategy	+$299.9K +29.7K shares	$607.7K 60.2K shares

Biggest Sellers

Institution	Net Sold	Current Position
M MYDA Advisors LLC Hedge Fund•Long/Short	−$1.8M −169.2K shares	Sold Off 0 shares
SUSQUEHANNA INTERNATIONAL GROUP, LLP Private Equity	−$506.2K −50.1K shares	$172.9K 17.1K shares
SCHMEIDLER A R & CO INC RIA/Wealth	−$437.0K −43.3K shares	$413.7K 41.0K shares
COMMONS CAPITAL, LLC RIA/Wealth	−$319.3K −30.4K shares	Sold Off 0 shares
Ancora Advisors, LLC RIA/Wealth	−$307.4K −30.4K shares	$1.5M 150.4K shares
M MOODY NATIONAL BANK TRUST DIVISION Institution	−$263.0K −25.0K shares	Sold Off 0 shares
H HEARTLAND ADVISORS INC Long Only Manager	−$231.3K −22.9K shares	$4.6M 458.3K shares
B BRIDGEWAY CAPITAL MANAGEMENT INC Long Only Manager	−$213.6K −20.3K shares	Sold Off 0 shares
X XTX Topco Ltd Institution	−$199.4K −19.0K shares	Sold Off 0 shares
Marshall Wace LLP Institution	−$193.6K −18.4K shares	Sold Off 0 shares

Entry and Exit Activity

Institutions that initiated new positions or completely exited PESI in Q3 2025

New Positions: 10
New Value: $1.4M
Exited Positions: 7
Exited Value: $3.0M

New Positions

Institution	Position Value
D D. E. Shaw & Co., Inc. Institution	$467.7K 46.3K shares
CORSAIR CAPITAL MANAGEMENT LLC Hedge Fund•Multi-Strategy	$282.2K 27.9K shares
GUIDANCE CAPITAL, INC RIA/Wealth	$241.3K 17.3K shares
BLUE SQUARE ASSET MANAGEMENT, LLC Digital Asset Manager	$203.0K 20.1K shares
Verition Fund Management LLC Hedge Fund•Multi-Strategy	$146.0K 14.5K shares
Quest Partners LLC Hedge Fund•Quant Macro	$7.3K 719.0 shares
Rockefeller Capital Management L.P. Long Only Manager	$5.1K 500.0 shares
O Optiver Holding B.V. Institution	$3.0K 298.0 shares
SRS Capital Advisors, Inc. RIA/Wealth	$2.3K 226.0 shares
Sunbelt Securities, Inc. RIA/Wealth	$71.0 7.0 shares

Exited Positions

Institution	Previous Position
M MYDA Advisors LLC Hedge Fund•Long/Short	$1.8M 169.2K shares
COMMONS CAPITAL, LLC RIA/Wealth	$319.3K 30.4K shares
M MOODY NATIONAL BANK TRUST DIVISION Institution	$263.0K 25.0K shares
B BRIDGEWAY CAPITAL MANAGEMENT INC Long Only Manager	$213.6K 20.3K shares
X XTX Topco Ltd Institution	$199.4K 19.0K shares
Marshall Wace LLP Institution	$193.6K 18.4K shares
RAYMOND JAMES FINANCIAL INC RIA/Wealth	$12.2K 1.2K shares

Options Activity

Institutions with the largest Call and Put options positions in PESI as of Q3 2025

Call Positions: 3
Call Value: $1.1M
Put Positions: 2
Put Value: $293.9K

Call Positions

Institution	Position Value
M MYDA Advisors LLC Hedge Fund•Long/Short	$505.0K 500.0 contracts
SUSQUEHANNA INTERNATIONAL GROUP, LLP Private Equity	$418.1K 414.0 contracts
CITADEL ADVISORS LLC Hedge Fund•Multi-Strategy	$150.5K 149.0 contracts

Put Positions

Institution	Position Value
SUSQUEHANNA INTERNATIONAL GROUP, LLP Private Equity	$293.9K 291.0 contracts
CITADEL ADVISORS LLC Hedge Fund•Multi-Strategy	- - contracts

Most Committed Institutions

Institutions with PESI as the highest % of their portfolio as of Q3 2025

Institution	Key People	Portfolio Weight	Ownership	Owned Since	Total AUM (Long)
MAK CAPITAL ONE LLC Hedge Fund•Multi-Strategy	Michael Anthony Kaufman CIO	1.64% $8.2M	4.42% 815.6K shares	Q2 2025 Held for 5 months	$501.3M
PERRITT CAPITAL MANAGEMENT INC Long Only Manager	Mark J Buh President	0.84% $1.8M	0.95% 175.3K shares	Q4 2019 Held for 5y 11m	$211.0M
P PRESCOTT GROUP CAPITAL MANAGEMENT, L.L.C. Hedge Fund•Long/Short	Matthew Nicholas Dunham President	0.83% $7.8M	4.21% 777.1K shares	Q4 2023 Held for 1y 11m	$948.6M
ESSEX INVESTMENT MANAGEMENT CO LLC Long Only Manager	Nancy Beth Prial CEO	0.30% $2.0M	1.06% 196.2K shares	Q3 2023 Held for 2y 2m	$652.5M
H HEARTLAND ADVISORS INC Long Only Manager	William Richard Nasgovitz CEO	0.24% $4.6M	2.48% 458.3K shares	≤ Q2 2013 Held for 12y 5m+	$1.9B
BLUE SQUARE ASSET MANAGEMENT, LLC Digital Asset Manager	Jay Howard Bluestine CEO	0.09% $203.0K	0.11% 20.1K shares	Q3 2025 Held for 2 months	$229.3M
GUIDANCE CAPITAL, INC RIA/Wealth	Beau Justin Handy Managing Partner	0.06% $241.3K	0.09% 17.3K shares	Q3 2025 Held for 2 months	$383.2M
Legato Capital Management LLC Fund of Funds	Victor Louis Hymes CEO	0.06% $570.2K	0.31% 56.5K shares	Q3 2023 Held for 2y 2m	$915.6M
CORSAIR CAPITAL MANAGEMENT LLC Hedge Fund•Multi-Strategy	Jeffrey Archer Zelin COO	0.05% $282.2K	0.15% 27.9K shares	Q3 2025 Held for 2 months	$563.1M
P Pale Fire Capital SE Institution	-	0.05% $457.2K	0.25% 45.3K shares	Q1 2025 Held for 8 months	$912.4M

Hedge Fund Spotlight

Discover hedge funds investing in PESI

Fermata Advisors, LLC

Hedge Fund • Sector

Portfolio ManagerNelson Moonhun Seo

Portfolio Value: $371.6M
Positions: 207
Last Reported: Q3 2025

Sector Allocation

Position in Perma-Fix Environmental Services

Market Value: $154.8K
Shares Held: 15.3K
Portfolio Weight: 0.04%
Owned Since: 2023-Q4

Top Holding	Sector	Market Value	Weight
1 Apple AAPL	Consumer Electronics Technology	$13.6M	3.67%
2 JPMorgan Equity Premium Income JEPI	ETF ETF	$13.1M	3.53%
3 Dimensional International Core Equity Market DFAI	ETF ETF	$12.7M	3.43%