Perma Fix Environmental Services PESI Institutional Ownership

NASDAQ PESI

$15.41 -0.24 (-1.53%)

At close: Oct 1, 2026 · 4:00 PM EDT

Institutions by Trading Activity

91 Institutions

Increased 51 56.0%

Unchanged 23 25.3%

Reduced 17 18.7%

Ownership Statistics

13F · as of 30 Jun, 2026

Institutional Ownership

47.96%

▲+7.14 pp QoQ

Shares Held by Institutions

9.52Mn

of 19.84Mn outstanding

▲+26.78% QoQ

Shares Outstanding

19.84Mn

10.32Mn held outside 13F filers

Institutional Investors

filed 13F for Jun 2026

▲+6 vs prior quarter

Net Shares Added (QoQ)

+2.01Mn

accumulated since last quarter

Value of Holdings

$148.93Mn

reported market value

Shares Owned by Institutions

Shares held % of outstanding

Latest —

Average ownership —

Peak ownership —

Shares Purchased/Sold by Institutions

Accumulated Distributed

Latest quarter —

Net over range —

Accumulating quarters —

Ownership Summary

Quarter ending 30 Jun, 2026

Perma Fix Environmental Services Inc (NASDAQ:PESI) showed up in the 13F filings of 91 institutional investors as of June 2026.

Collectively, these holders controlled 48.0% of Perma Fix Environmental Services's outstanding shares in June 2026, up from 40.8% in March 2026.
Their total shares held in PESI increased 26.78% from the prior quarter, while the number of investors in Perma Fix Environmental Services increased 33.82% year over year.
Of these 91 funds, 51 grew their exposure to Perma Fix Environmental Services, 17 cut back, and 23 maintained positions.
Combined, these investors held 9.52Mn shares in PESI for June 2026, up by 2.01Mn shares quarter on quarter, and up 2.92Mn shares year over year.
BlackRock, Inc. holds the largest position in PESI at 1.25Mn shares as of June 30, 2026, or 6.31% of shares outstanding.
The biggest buyers of Perma Fix Environmental Services for the quarter ending June 2026 included KENNEDY CAPITAL MANAGEMENT LLC (610.9K), Diamond Hill Capital Management, LLC (Investment Advisor) (286.56K), Potomac Capital Management, Inc. (180.3K), SUSQUEHANNA INTERNATIONAL GROUP, LLP (145.84K), Diametric Capital, LP (114.71K).
Leading sellers of Perma Fix Environmental Services shares for the quarter ending June 2026 were GROUP ONE TRADING LLC (125.06K), D. E. Shaw & Co., Inc. (38.13K), UBS Group AG (30.59K), MYDA Advisors LLC (30.0K), Squarepoint Ops LLC (20.96K).
Per Business Quant, the top 10 investors in PESI for the quarter ending June 2026 include BlackRock, Inc. (1.25Mn), MAK CAPITAL ONE LLC (1.03Mn), VANGUARD CAPITAL MANAGEMENT LLC (811.74K), PRESCOTT GROUP CAPITAL MANAGEMENT, L.L.C. (777.14K), Diamond Hill Capital Management, LLC (Investment Advisor) (642.53K), KENNEDY CAPITAL MANAGEMENT LLC (610.9K), Potomac Capital Management, Inc. (477.0K), GEODE CAPITAL MANAGEMENT, LLC (455.16K), HEARTLAND ADVISORS INC (400.0K), State Street Corp (349.74K).

Form 13F Holdings

91 Institutional Holders

Report period 30 Jun, 2026

Total shares held 9.52Mn

Of outstanding 47.96%

#	Institution	CIK	Shares Held	% of Outstanding	Change (QoQ)	Change (%)	Value (USD)
1	BlackRock, Inc.	0002012383	1,252,756	6.31%	▲82,453	+7.05%	$17.90Mn
2	MAK CAPITAL ONE LLC	0001385702	1,032,958	5.21%	▲114,285	+12.44%	$14.76Mn
3	VANGUARD CAPITAL MANAGEMENT LLC	0002100119	811,743	4.09%	▲52,308	+6.89%	$11.60Mn
4	PRESCOTT GROUP CAPITAL MANAGEMENT, L.L.C.	0001166152	777,142	3.92%	0	0.00%	$11.11Mn
5	Diamond Hill Capital Management, LLC (Investment Advisor)	0001217541	642,533	3.24%	▲286,555	+80.50%	$9.18Mn
6	KENNEDY CAPITAL MANAGEMENT LLC	0000884589	610,903	3.08%	▲610,903	0.00%	$8.73Mn
7	Potomac Capital Management, Inc.	0001418746	477,000	2.40%	▲180,300	+60.77%	$6.82Mn
8	GEODE CAPITAL MANAGEMENT, LLC	0001214717	455,156	2.29%	▲22,455	+5.19%	$6.51Mn
9	HEARTLAND ADVISORS INC	0000937394	400,000	2.02%	0	0.00%	$5.72Mn
10	State Street Corp	0000093751	349,744	1.76%	▲14,197	+4.23%	$5.00Mn
11	DIMENSIONAL FUND ADVISORS LP	0000354204	191,063	0.96%	▲27,276	+16.65%	$2.73Mn
12	Goldman Sachs Group Inc	0000886982	162,755	0.82%	▲20,068	+14.06%	$2.33Mn
13	SUSQUEHANNA INTERNATIONAL GROUP, LLP	0001446194	156,934	0.79%	▲145,836	+1,314.07%	$2.24Mn
14	CITADEL ADVISORS LLC	0001423053	152,626	0.77%	▲83,313	+120.20%	$2.18Mn
15	Northern Trust Corp	0000073124	141,639	0.71%	▲12,071	+9.32%	$2.02Mn
16	VANGUARD FIDUCIARY TRUST CO	0000933478	123,040	0.62%	▲3,787	+3.18%	$1.76Mn
17	GROUP ONE TRADING LLC	0000932540	122,611	0.62%	▼125,063	-50.50%	$1.75Mn
18	VANGUARD PORTFOLIO MANAGEMENT LLC	0002100121	121,267	0.61%	▲20,949	+20.88%	$1.73Mn
19	North Star Investment Management Corp.	0001342857	120,532	0.61%	0	0.00%	$1.72Mn
20	Diametric Capital, LP	0001719087	114,714	0.58%	▲114,714	0.00%	$1.64Mn

Showing 1 to 20 of 91 holders