Perma Fix Environmental Services Inc (PESI) Institutional Ownership

Institutions by Trading Activity

Ownership Statistics

18,350,000Shares Outstanding

948,126Shares held by institutions

$13,747,827Value of institutional holdings

42.86%Institutional ownership %

14.52%Shares Changed QoQ

80No. of institutional investors

Shares Owned by Institutions

Shares Purchased/Sold by Institutions

Ownership Summary

Recent 13F filings as of December 2025 show that 80 institutional investors hold a position in Perma Fix Environmental Services Inc (NASDAQ:PESI).

The collective stake of institutional investors in Perma Fix Environmental Services moved to 42.9% in December 2025, a shift up from the 40.4% reported for September 2025.
Institutional share ownership changed by 14.52% QoQ, while the number of institutional owners saw an increase of 6.67% YoY.
Among the 80 institutional holders of Perma Fix Environmental Services, 36 added to their stakes while 27 trimmed their positions and 17 held steady.
The total number of shares held by institutions in Perma Fix Environmental Services increased to 7.87Mn as of December 2025, a net change of up by 997.13K shares quarter on quarter, and up 495.58K shares year over year.
BlackRock, Inc. continues to be the largest institutional holder of Perma Fix Environmental Services as of December 31, 2025, with a position of 1.20Mn shares, representing 6.53% of the company's outstanding stock.
Among the most significant buyers of Perma Fix Environmental Services during December 2025 were Potomac Capital Management, Inc. (341.80K), Rothschild Wealth LLC (166.30K), MAK CAPITAL ONE LLC (103.10K), MYDA Advisors LLC (100.00K), JANE STREET GROUP, LLC (86.04K).
Leading sellers of Perma Fix Environmental Services stock in December 2025 included Ancora Advisors LLC (92.43K), HEARTLAND ADVISORS INC (58.25K), MORGAN STANLEY (32.92K), CITADEL ADVISORS LLC (24.04K), OSAIC HOLDINGS, INC. (20.00K).
The top 10 institutional holders of Perma Fix Environmental Services for the quarter ending December 2025 included BlackRock, Inc. (1.20Mn), 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 (400.00K), DIAMOND HILL CAPITAL MANAGEMENT INC (386.84K), Potomac Capital Management, Inc. (341.80K), STATE STREET CORP (312.27K), Rothschild Wealth LLC (166.30K).

80 Institutional Holders

948,126 Total Shares Held

Rows:

Download Data

Owner Name	Date	Shares Held	Change (QoQ)	Change (%)	Value (USD)
BlackRock, Inc.	31 Dec, 2025	1,197,985	30,253	2.59%	$15,082,631.00
VANGUARD GROUP INC	31 Dec, 2025	968,107	32,165	3.44%	$12,188,467.00
MAK CAPITAL ONE LLC	31 Dec, 2025	918,673	103,097	12.64%	$11,566,093.00
PRESCOTT GROUP CAPITAL MANAGEMENT, L.L.C.	31 Dec, 2025	777,142	0	0.00%	$9,784,218.00
GEODE CAPITAL MANAGEMENT, LLC	31 Dec, 2025	422,890	1,655	0.39%	$5,325,211.00
HEARTLAND ADVISORS INC	31 Dec, 2025	400,000	-58,250	-12.71%	$5,036,000.00
DIAMOND HILL CAPITAL MANAGEMENT INC	31 Dec, 2025	386,843	-14,716	-3.66%	$4,870,353.00
Potomac Capital Management, Inc.	31 Dec, 2025	341,800	341,800	0.00%	$4,303,262.00
STATE STREET CORP	31 Dec, 2025	312,267	13,879	4.65%	$3,931,442.00
Rothschild Wealth LLC	31 Dec, 2025	166,300	166,300	0.00%	$2,093,717.00
PERRITT CAPITAL MANAGEMENT INC	31 Dec, 2025	166,300	-9,000	-5.13%	$2,093,717.00
DIMENSIONAL FUND ADVISORS LP	31 Dec, 2025	164,787	7,934	5.06%	$2,075,216.00
JANE STREET GROUP, LLC	31 Dec, 2025	144,239	86,038	147.83%	$1,815,969.00
NORTHERN TRUST CORP	31 Dec, 2025	123,509	-11,953	-8.82%	$1,554,977.00
MYDA Advisors LLC	31 Dec, 2025	100,000	100,000	0.00%	$1,259,000.00
SUSQUEHANNA INTERNATIONAL GROUP, LLP	31 Dec, 2025	98,269	81,151	474.07%	$1,237,207.00
D. E. Shaw & Co., Inc.	31 Dec, 2025	96,009	49,704	107.34%	$1,208,753.00
GOLDMAN SACHS GROUP INC	31 Dec, 2025	71,937	7,683	11.96%	$905,687.00
MORGAN STANLEY	31 Dec, 2025	66,731	-32,916	-33.03%	$840,144.00
Informed Momentum Co LLC	31 Dec, 2025	64,784	64,784	0.00%	$815,631.00

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