Perma-Fix Environmental Services

PESI · NASDAQ

$12.38+$0.32 (+2.65%)TodayMarket closed · Oct 20, 6:50 PM ET

Prev close $12.06

Who owns PESI

Largest institutional holders, from their latest 13F filings

The 10 largest institutions hold 46.3% of PESI’s shares.

HOLD Alapkezelo Zrt10.6%
Schelhammer Capital Bank AG7.6%
BlackRock Institutional Trust Company, N.A.5.4%
MAK Capital One, LLC4.8%
Next 6 largest institutions17.8%
All other shareholders53.7%

Top institutional holders of PESI
Holder	Shares	% of shares	Change, last filing	Filed
HOLD Alapkezelo Zrt	2.25M	10.61%	+1.31M	Aug 25, 2026
Schelhammer Capital Bank AG	1.61M	7.61%	−14.38K	May 28, 2026
BlackRock Institutional Trust Company, N.A.	1.15M	5.44%	+81.83K	Jun 30, 2026
MAK Capital One, LLC	1.02M	4.79%	−145.32K	Aug 24, 2026
Vanguard Capital Management, LLC	811.74K	3.83%	+52.31K	Jun 30, 2026
Prescott Group Capital Management, LLC	777.14K	3.67%	+0	Jun 30, 2026
Diamond Hill Capital Management Inc.	642.53K	3.03%	+286.56K	Jun 30, 2026
Kennedy Capital Management LLC	610.90K	2.88%	+610.90K	Jun 30, 2026
Potomac Capital Management Inc.	477.00K	2.25%	+180.30K	Jun 30, 2026
Geode Capital Management, L.L.C.	455.16K	2.15%	+22.45K	Jun 30, 2026

Largest mutual fund holders

Top mutual fund holders of PESI
Holder	Shares	% of shares	Change, last filing	Filed
Vanguard Total Stock Market Index Fund	597.75K	2.82%	+0	Jul 31, 2026
iShares Russell 2000 ETF	458.20K	2.16%	−1.99K	Jul 31, 2026
Heartland Value Fund	400.00K	1.89%	+0	Jun 30, 2026
Diamond Hill Small Cap Fund	309.77K	1.46%	+18.90K	Jul 31, 2026
Vanguard Extended Market Index Fund	203.15K	0.96%	+8.99K	Jul 31, 2026

Insider trades

Form 4 filings by officers, directors and large holders

Insiders made no open-market buys or sales of PESI in the last 6 months.

Latest PESI insider transactions
Insider	Date	Type	Shares	Price	Value
Duggan Kerry C	Oct 1, 2026	Award	748	$11.74	$8.78K
Grumski Joseph Timothy	Oct 1, 2026	Award	1.44K	$11.74	$16.88K
Wamp Zach Paul	Oct 1, 2026	Award	775	$11.74	$9.10K
Bostick Thomas	Oct 1, 2026	Award	1.11K	$11.74	$13.01K
Shelton Larry	Oct 1, 2026	Award	1.25K	$11.74	$14.62K
REEDER JOE	Oct 1, 2026	Award	1.29K	$11.74	$15.13K
ZWECKER MARK A	Oct 1, 2026	Award	1.04K	$11.74	$12.18K
REEDER JOE	Jul 22, 2026	Award	10.00K	—	—
Duggan Kerry C	Jul 22, 2026	Award	10.00K	—	—
Grumski Joseph Timothy	Jul 22, 2026	Award	10.00K	—	—

Short interest

Settled Sep 30, 2026

Shares short: 3.20M
Days to cover: 8.13
% of shares outstanding: 15.11%
Average daily volume: 394.15K
Change since last report: +19.9%

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