Perma Fix Environmental Services Inc (PESI) Institutional Ownership

Institutions by Trading Activity

Ownership Statistics

0Shares Outstanding

963,809Shares held by institutions

$10,023,614Value of institutional holdings

46.17%Institutional ownership %

36.41%Shares Changed QoQ

68No. of institutional investors

Shares Owned by Institutions

Shares Purchased/Sold by Institutions

Ownership Summary

Perma Fix Environmental Services Inc (NASDAQ:PESI) is held by 81 institutional investors per 13F filings through December 2025.

Their combined ownership stood at 42.6% of outstanding shares in December 2025, up from 40.5% in September 2025.
Their total shares held in PESI increased 13.61% from the prior quarter, while the number of investors in Perma Fix Environmental Services increased 8.0% year over year.
Of these 81 holders, 35 added to their stakes in Perma Fix Environmental Services, 28 trimmed positions, and 18 made no changes.
The aggregate institutional position in Perma Fix Environmental Services amounted to 7.87Mn shares as of December 2025, up by 942.36K shares quarter on quarter, and down 503.48K shares year over year.
BlackRock, Inc. holds the largest position in PESI at 1.2Mn shares as of December 31, 2025, or 6.49% of shares outstanding.
The biggest buyers of Perma Fix Environmental Services for the quarter ending December 2025 included Potomac Capital Management, Inc. (341.8K), Rothschild Wealth LLC (166.3K), MAK CAPITAL ONE LLC (103.1K), MYDA Advisors LLC (100.0K), JANE STREET GROUP, LLC (86.04K).
The largest sales of PESI for the quarter ending December 2025 came from Ancora Advisors LLC (92.43K), HEARTLAND ADVISORS INC (58.25K), Bank Of America Corp /De/ (51.81K), Morgan Stanley (32.92K), CITADEL ADVISORS LLC (24.04K).
Per Business Quant data, the top 10 holders of Perma Fix Environmental Services for the quarter ending December 2025 are BlackRock, Inc. (1.2Mn), VANGUARD GROUP INC (968.11K), MAK CAPITAL ONE LLC (918.67K), PRESCOTT GROUP CAPITAL MANAGEMENT, L.L.C. (777.14K), GEODE CAPITAL MANAGEMENT, LLC (422.89K), HEARTLAND ADVISORS INC (400.0K), DIAMOND HILL CAPITAL MANAGEMENT INC (386.84K), Potomac Capital Management, Inc. (341.8K), State Street Corp (312.27K), PERRITT CAPITAL MANAGEMENT INC (166.3K).

81 Institutional Holders

963,809 Total Shares Held

Rows:

Download Data

Owner Name	Date	Change (QoQ)	Change (%)	Value (USD)
BlackRock, Inc.	31 Dec, 2025	30,253	2.59%	$0.00
VANGUARD GROUP INC	31 Dec, 2025	32,165	3.44%	$0.00
Rothschild Wealth LLC	31 Dec, 2025	166,300	0.00%	$0.00
Barclays Plc	31 Dec, 2025	-18,194	-40.27%	$0.00
MAK CAPITAL ONE LLC	31 Dec, 2025	103,097	12.64%	$0.00
GatePass Capital, LLC	31 Dec, 2025	0	0.00%	$0.00
Rockefeller Capital Management L.P.	31 Dec, 2025	500	100.00%	$0.00
PRESCOTT GROUP CAPITAL MANAGEMENT, L.L.C.	31 Dec, 2025	0	0.00%	$0.00
Pale Fire Capital SE	31 Dec, 2025	-2,050	-4.53%	$0.00
GEODE CAPITAL MANAGEMENT, LLC	31 Dec, 2025	1,655	0.39%	$0.00
Squarepoint Ops LLC	31 Dec, 2025	36,842	0.00%	$0.00
HEARTLAND ADVISORS INC	31 Dec, 2025	-58,250	-12.71%	$0.00
UBS Group AG	31 Dec, 2025	4,050	16.26%	$0.00
DIAMOND HILL CAPITAL MANAGEMENT INC	31 Dec, 2025	-14,716	-3.66%	$0.00
Nuveen, LLC	31 Dec, 2025	0	0.00%	$0.00
Potomac Capital Management, Inc.	31 Dec, 2025	341,800	0.00%	$0.00
Brookwood Investment Group LLC	31 Dec, 2025	5,930	39.68%	$0.00
State Street Corp	31 Dec, 2025	13,879	4.65%	$0.00
GUIDANCE CAPITAL, INC	31 Dec, 2025	-139	-0.80%	$0.00
PERRITT CAPITAL MANAGEMENT INC	31 Dec, 2025	-9,000	-5.13%	$0.00

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