PESI US Equity

PERMA FIX ENVIRONMENTAL SERVICES INC

Nasdaq+ Compare Tear sheet →

Industrials · Hazardous Waste Management · CIK 891532 · FYE 1231

$16.64

+0.96 (+6.12%)

USD · as of 2026-07-28 · marketstack

Switch Ticker

Institutional ownership· 13F filers holding PESI · 2026-Q1 methodology → sources →

85 holders

% of shares outstanding held

40.8%

Shares held (13F)

7,569,045

Reporting holders

Top holders

largest 85 of 85 · Δ vs 2025-Q4

#	Holder	Shares	Value	% of shares out	Δ QoQ
1	BlackRock, Inc.	1,170,3031.2M	$13M	6.30%	TRIM -2%
2	MAK CAPITAL ONE LLC	918,673918,673	$10M	4.95%	—
3	Prescott Group Capital Management, L.L.C.	777,142777,142	$8M	4.19%	—
4	VANGUARD CAPITAL MANAGEMENT LLC	759,435759,435	$8M	4.09%	NEW†
5	GEODE CAPITAL MANAGEMENT, LLC	432,701432,701	$5M	2.33%	ADD 2%
6	HEARTLAND ADVISORS INC	400,000400,000	$4M	2.15%	—
7	DIAMOND HILL CAPITAL MANAGEMENT INC	355,978355,978	$4M	1.92%	TRIM -8%
8	STATE STREET CORP	335,547335,547	$4M	1.81%	ADD 7%
9	Potomac Capital Management, Inc.	296,700296,700	$3M	1.60%	TRIM -13%
10	GROUP ONE TRADING LLC	247,674247,674	$3M	1.33%	ADD 6050%
11	DIMENSIONAL FUND ADVISORS LP	163,787163,787	$2M	0.88%	—
12	GOLDMAN SACHS GROUP INC	142,687142,687	$2M	0.77%	ADD 98%
13	NORTHERN TRUST CORP	129,568129,568	$1M	0.70%	ADD 5%
14	North Star Investment Management Corp.	120,532120,532	$1M	0.65%	ADD 2639%
15	MYDA Advisors LLC	120,000120,000	$1M	0.65%	ADD 20%
16	VANGUARD FIDUCIARY TRUST CO	119,253119,253	$1M	0.64%	NEW
17	VANGUARD PORTFOLIO MANAGEMENT LLC	100,318100,318	$1M	0.54%	NEW
18	CITADEL ADVISORS LLC	69,31369,313	$740,956	0.37%	ADD 92%
19	D. E. Shaw & Co., Inc.	62,98962,989	$673,352	0.34%	TRIM -34%
20	UBS Group AG	62,08262,082	$663,657	0.33%	ADD 114%
21	Squarepoint Ops LLC	51,94051,940	$555,239	0.28%	ADD 41%
22	Pale Fire Capital SE	48,62648,626	$519,812	0.26%	ADD 13%
23	BANK OF AMERICA CORP /DE/	45,19045,190	$483,081	0.24%	ADD 3%
24	CHARLES SCHWAB INVESTMENT MANAGEMENT INC	43,59043,590	$465,977	0.23%	TRIM -10%
25	Bank of New York Mellon Corp	40,37940,379	$431,647	0.22%	TRIM -8%
26	CORSAIR CAPITAL MANAGEMENT, L.P.	37,64937,649	$402,468	0.20%	ADD 74%
27	SIMPLEX TRADING, LLC	31,31831,318	$334,789	0.17%	NEW
28	GatePass Capital, LLC	29,74229,742	$317,938	0.16%	TRIM -54%
29	JANE STREET GROUP, LLC	28,52528,525	$304,932	0.15%	TRIM -80%
30	MORGAN STANLEY	26,71826,718	$285,615	0.14%	TRIM -60%
31	XTX Topco Ltd	23,22723,227	$248,297	0.13%	NEW
32	Nuveen, LLC	22,45422,454	$240,033	0.12%	—
33	RHUMBLINE ADVISERS	21,41021,410	$228,865	0.12%	—
34	WELLS FARGO & COMPANY/MN	20,83020,830	$222,673	0.11%	TRIM -35%
35	Rothschild Wealth LLC	20,60020,600	$220,214	0.11%	TRIM -88%
36	BROWN ADVISORY INC	20,00020,000	$213,800	0.11%	NEW
37	GUIDANCE CAPITAL, INC	16,30216,302	$210,785	0.09%	TRIM -5%
38	BAILARD, INC.	17,80017,800	$190,282	0.10%	—
39	Oxler Private Wealth LLC	17,00517,005	$181,784	0.09%	—
40	IMC-Chicago, LLC	16,93316,933	$181,014	0.09%	NEW
41	Quent Capital, LLC	16,19916,199	$173,167	0.09%	—
42	GSA CAPITAL PARTNERS LLP	16,09716,097	$172,000	0.09%	NEW
43	OSAIC HOLDINGS, INC.	16,00016,000	$171,040	0.09%	—
44	DEUTSCHE BANK AG\	14,62114,621	$156,298	0.08%	ADD 22%
45	Fermata Advisors, LLC	12,93612,936	$138,286	0.07%	ADD 2%
46	Greenhaven Road Investment Management, L.P.	11,30311,303	$120,452	0.06%	NEW
47	PRICE T ROWE ASSOCIATES INC /MD/	11,20211,202	$120,000	0.06%	—
48	Invesco Ltd.	11,13511,135	$119,033	0.06%	NEW
49	SUSQUEHANNA INTERNATIONAL GROUP, LLP	11,09811,098	$118,638	0.06%	TRIM -89%
50	AMERICAN CENTURY COMPANIES INC	10,69210,692	$114,298	0.06%	NEW
51	Vident Advisory, LLC	10,39010,390	$111,069	0.06%	NEW
52	MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.	8,2238,223	$87,904	0.04%	ADD 3%
53	JPMORGAN CHASE & CO	7,0827,082	$73,652	0.04%	—
54	Vanguard Global Advisers, LLC	5,7425,742	$61,382	0.03%	NEW
55	Police & Firemen's Retirement System of New Jersey	5,6495,649	$60,388	0.03%	—
56	Capital Advisors, Ltd. LLC	5,0005,000	$53,000	0.03%	NEW
57	MetLife Investment Management, LLC	4,9224,922	$52,616	0.03%	TRIM -46%
58	FMR LLC	4,7264,726	$50,521	0.03%	TRIM -17%
59	NEW YORK STATE COMMON RETIREMENT FUND	4,4004,400	$47,036	0.02%	—
60	BNP PARIBAS FINANCIAL MARKETS	3,6693,669	$39,222	0.02%	TRIM -4%
61	BARCLAYS PLC	3,2733,273	$34,988	0.02%	TRIM -88%
62	Russell Investments Group, Ltd.	1,7321,732	$18,514	0.01%	ADD 7%
63	Legal & General Group Plc	1,5581,558	$16,655	0.01%	TRIM -3%
64	Tower Research Capital LLC (TRC)	1,5281,528	$16,334	0.01%	TRIM -52%
65	Ameritas Investment Partners, Inc.	1,2321,232	$13,170	0.01%	—
66	CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM	936936	$10,006	0.01%	TRIM -12%
67	CITIGROUP INC	819819	$8,755	0.00%	ADD 109%
68	Sterling Capital Management LLC	501501	$5,356	0.00%	TRIM -42%
69	Rockefeller Capital Management L.P.	500500	$5,345	0.00%	—
70	GAMMA Investing LLC	214214	$2,288	0.00%	—
71	CWM, LLC	195195	$2,085	0.00%	ADD 67%
72	Optiver Holding B.V.	170170	$1,817	0.00%	TRIM -43%
73	JONES FINANCIAL COMPANIES LLLP	140140	$1,491	0.00%	NEW
74	ROYAL BANK OF CANADA	5050	$1,000	0.00%	TRIM -95%
75	NISA INVESTMENT ADVISORS, LLC	7171	$759	0.00%	—
76	Torren Management, LLC	5353	$567	0.00%	—
77	ROTHSCHILD INVESTMENT LLC	2020	$214	0.00%	—
78	Caitong International Asset Management Co., Ltd	1414	$150	0.00%	NEW
79	Essential Partners LLC	99	$96	0.00%	—
80	PNC FINANCIAL SERVICES GROUP, INC.	88	$86	0.00%	—
81	Sunbelt Securities, Inc.	77	$75	0.00%	—
82	CoreCap Advisors, LLC	55	$53	0.00%	—
83	Farther Finance Advisors, LLC	22	$22	0.00%	NEW
84	MORGAN DEMPSEY CAPITAL MANAGEMENT LLC	11	$11	0.00%	—
85	SBI Securities Co., Ltd.	11	$11	0.00%	—

† a filer this large appearing as NEW usually reflects a renamed or succeeded filing entity (the old name stops filing the same quarter) — not a brand-new position.

Rows rank by the value each filer reported — 13F filers price their own positions, so a holder with fewer shares can rank just above one with more.

Holder trends· top 15 holders · shares held over 6 quarters

green added · red trimmed

Holder

2024-Q4

2025-Q1

2025-Q2

2025-Q3

2025-Q4

2026-Q1

Latest value

BlackRock, Inc.

1.0M

1.1M

1.2M

$13M

MAK CAPITAL ONE LLC

—

93K

816K

919K

$10M

Prescott Group Capital Management, L.L.C.

747K

777K

$8M

VANGUARD CAPITAL MANAGEMENT LLC

—

759K

$8M

GEODE CAPITAL MANAGEMENT, LLC

327K

393K

422K

421K

423K

433K

$5M

HEARTLAND ADVISORS INC

400K

455K

481K

458K

400K

$4M

DIAMOND HILL CAPITAL MANAGEMENT INC

316K

417K

394K

402K

387K

356K

$4M

STATE STREET CORP

183K

192K

288K

298K

312K

336K

$4M

Potomac Capital Management, Inc.

—

342K

297K

$3M

GROUP ONE TRADING LLC

—

721

248K

$3M

DIMENSIONAL FUND ADVISORS LP

112K

124K

152K

157K

165K

164K

$2M

GOLDMAN SACHS GROUP INC

40K

25K

—

64K

72K

143K

$2M

NORTHERN TRUST CORP

121K

139K

134K

135K

124K

130K

$1M

North Star Investment Management Corp.

—

121K

$1M

MYDA Advisors LLC

225K

200K

169K

—

100K

120K

$1M

Shares reported each quarter by the largest current holders. Green = added vs the prior filing, red = trimmed, grey = roughly held; a dash is a quarter with no 13F on file (a gap is skipped, not read as an exit). 13F is filed up to 45 days after quarter-end. Up to 40 quarters (10 years) available — use the selector above.

Institutional footprint by quarter

Line breaks are honest gaps — quarters with no 13F record, or a suppressed % — never interpolated. % of shares outstanding uses today's share count for every quarter (the only count stored).

Quarter	Holders	Shares held	% shares out	Value held
2026-Q1	85	7,569,045	40.8%	$81M
2025-Q4	84	7,876,466	42.4%

Short interest has its own tab now — open SI →

Source: SEC Form 13F — every institution manager (≥ $100M in 13F securities) reporting a long US-listed position, across ~10,250 filers over 10 years of history. 13F is long-only, US-listed, filed up to 45 days after quarter-end.

Institutional ownership· 13F filers holding PESI · 2026-Q1 methodology → sources →

85 holders

% of shares outstanding held

40.8%

Shares held (13F)

7,569,045

Reporting holders

Top holders

largest 85 of 85 · Δ vs 2025-Q4

#	Holder	Shares	Value	% of shares out	Δ QoQ
1	BlackRock, Inc.	1,170,3031.2M	$13M	6.30%	TRIM -2%
2	MAK CAPITAL ONE LLC	918,673918,673	$10M	4.95%	—
3	Prescott Group Capital Management, L.L.C.	777,142777,142	$8M	4.19%	—
4	VANGUARD CAPITAL MANAGEMENT LLC	759,435759,435	$8M	4.09%	NEW†
5	GEODE CAPITAL MANAGEMENT, LLC	432,701432,701	$5M	2.33%	ADD 2%
6	HEARTLAND ADVISORS INC	400,000400,000	$4M	2.15%	—
7	DIAMOND HILL CAPITAL MANAGEMENT INC	355,978355,978	$4M	1.92%	TRIM -8%
8	STATE STREET CORP	335,547335,547	$4M	1.81%	ADD 7%
9	Potomac Capital Management, Inc.	296,700296,700	$3M	1.60%	TRIM -13%
10	GROUP ONE TRADING LLC	247,674247,674	$3M	1.33%	ADD 6050%
11	DIMENSIONAL FUND ADVISORS LP	163,787163,787	$2M	0.88%	—
12	GOLDMAN SACHS GROUP INC	142,687142,687	$2M	0.77%	ADD 98%
13	NORTHERN TRUST CORP	129,568129,568	$1M	0.70%	ADD 5%
14	North Star Investment Management Corp.	120,532120,532	$1M	0.65%	ADD 2639%
15	MYDA Advisors LLC	120,000120,000	$1M	0.65%	ADD 20%
16	VANGUARD FIDUCIARY TRUST CO	119,253119,253	$1M	0.64%	NEW
17	VANGUARD PORTFOLIO MANAGEMENT LLC	100,318100,318	$1M	0.54%	NEW
18	CITADEL ADVISORS LLC	69,31369,313	$740,956	0.37%	ADD 92%
19	D. E. Shaw & Co., Inc.	62,98962,989	$673,352	0.34%	TRIM -34%
20	UBS Group AG	62,08262,082	$663,657	0.33%	ADD 114%
21	Squarepoint Ops LLC	51,94051,940	$555,239	0.28%	ADD 41%
22	Pale Fire Capital SE	48,62648,626	$519,812	0.26%	ADD 13%
23	BANK OF AMERICA CORP /DE/	45,19045,190	$483,081	0.24%	ADD 3%
24	CHARLES SCHWAB INVESTMENT MANAGEMENT INC	43,59043,590	$465,977	0.23%	TRIM -10%
25	Bank of New York Mellon Corp	40,37940,379	$431,647	0.22%	TRIM -8%
26	CORSAIR CAPITAL MANAGEMENT, L.P.	37,64937,649	$402,468	0.20%	ADD 74%
27	SIMPLEX TRADING, LLC	31,31831,318	$334,789	0.17%	NEW
28	GatePass Capital, LLC	29,74229,742	$317,938	0.16%	TRIM -54%
29	JANE STREET GROUP, LLC	28,52528,525	$304,932	0.15%	TRIM -80%
30	MORGAN STANLEY	26,71826,718	$285,615	0.14%	TRIM -60%
31	XTX Topco Ltd	23,22723,227	$248,297	0.13%	NEW
32	Nuveen, LLC	22,45422,454	$240,033	0.12%	—
33	RHUMBLINE ADVISERS	21,41021,410	$228,865	0.12%	—
34	WELLS FARGO & COMPANY/MN	20,83020,830	$222,673	0.11%	TRIM -35%
35	Rothschild Wealth LLC	20,60020,600	$220,214	0.11%	TRIM -88%
36	BROWN ADVISORY INC	20,00020,000	$213,800	0.11%	NEW
37	GUIDANCE CAPITAL, INC	16,30216,302	$210,785	0.09%	TRIM -5%
38	BAILARD, INC.	17,80017,800	$190,282	0.10%	—
39	Oxler Private Wealth LLC	17,00517,005	$181,784	0.09%	—
40	IMC-Chicago, LLC	16,93316,933	$181,014	0.09%	NEW
41	Quent Capital, LLC	16,19916,199	$173,167	0.09%	—
42	GSA CAPITAL PARTNERS LLP	16,09716,097	$172,000	0.09%	NEW
43	OSAIC HOLDINGS, INC.	16,00016,000	$171,040	0.09%	—
44	DEUTSCHE BANK AG\	14,62114,621	$156,298	0.08%	ADD 22%
45	Fermata Advisors, LLC	12,93612,936	$138,286	0.07%	ADD 2%
46	Greenhaven Road Investment Management, L.P.	11,30311,303	$120,452	0.06%	NEW
47	PRICE T ROWE ASSOCIATES INC /MD/	11,20211,202	$120,000	0.06%	—
48	Invesco Ltd.	11,13511,135	$119,033	0.06%	NEW
49	SUSQUEHANNA INTERNATIONAL GROUP, LLP	11,09811,098	$118,638	0.06%	TRIM -89%
50	AMERICAN CENTURY COMPANIES INC	10,69210,692	$114,298	0.06%	NEW
51	Vident Advisory, LLC	10,39010,390	$111,069	0.06%	NEW
52	MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.	8,2238,223	$87,904	0.04%	ADD 3%
53	JPMORGAN CHASE & CO	7,0827,082	$73,652	0.04%	—
54	Vanguard Global Advisers, LLC	5,7425,742	$61,382	0.03%	NEW
55	Police & Firemen's Retirement System of New Jersey	5,6495,649	$60,388	0.03%	—
56	Capital Advisors, Ltd. LLC	5,0005,000	$53,000	0.03%	NEW
57	MetLife Investment Management, LLC	4,9224,922	$52,616	0.03%	TRIM -46%
58	FMR LLC	4,7264,726	$50,521	0.03%	TRIM -17%
59	NEW YORK STATE COMMON RETIREMENT FUND	4,4004,400	$47,036	0.02%	—
60	BNP PARIBAS FINANCIAL MARKETS	3,6693,669	$39,222	0.02%	TRIM -4%
61	BARCLAYS PLC	3,2733,273	$34,988	0.02%	TRIM -88%
62	Russell Investments Group, Ltd.	1,7321,732	$18,514	0.01%	ADD 7%
63	Legal & General Group Plc	1,5581,558	$16,655	0.01%	TRIM -3%
64	Tower Research Capital LLC (TRC)	1,5281,528	$16,334	0.01%	TRIM -52%
65	Ameritas Investment Partners, Inc.	1,2321,232	$13,170	0.01%	—
66	CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM	936936	$10,006	0.01%	TRIM -12%
67	CITIGROUP INC	819819	$8,755	0.00%	ADD 109%
68	Sterling Capital Management LLC	501501	$5,356	0.00%	TRIM -42%
69	Rockefeller Capital Management L.P.	500500	$5,345	0.00%	—
70	GAMMA Investing LLC	214214	$2,288	0.00%	—
71	CWM, LLC	195195	$2,085	0.00%	ADD 67%
72	Optiver Holding B.V.	170170	$1,817	0.00%	TRIM -43%
73	JONES FINANCIAL COMPANIES LLLP	140140	$1,491	0.00%	NEW
74	ROYAL BANK OF CANADA	5050	$1,000	0.00%	TRIM -95%
75	NISA INVESTMENT ADVISORS, LLC	7171	$759	0.00%	—
76	Torren Management, LLC	5353	$567	0.00%	—
77	ROTHSCHILD INVESTMENT LLC	2020	$214	0.00%	—
78	Caitong International Asset Management Co., Ltd	1414	$150	0.00%	NEW
79	Essential Partners LLC	99	$96	0.00%	—
80	PNC FINANCIAL SERVICES GROUP, INC.	88	$86	0.00%	—
81	Sunbelt Securities, Inc.	77	$75	0.00%	—
82	CoreCap Advisors, LLC	55	$53	0.00%	—
83	Farther Finance Advisors, LLC	22	$22	0.00%	NEW
84	MORGAN DEMPSEY CAPITAL MANAGEMENT LLC	11	$11	0.00%	—
85	SBI Securities Co., Ltd.	11	$11	0.00%	—

† a filer this large appearing as NEW usually reflects a renamed or succeeded filing entity (the old name stops filing the same quarter) — not a brand-new position.

Rows rank by the value each filer reported — 13F filers price their own positions, so a holder with fewer shares can rank just above one with more.

Holder trends· top 15 holders · shares held over 6 quarters

green added · red trimmed

Holder

2024-Q4

2025-Q1

2025-Q2

2025-Q3

2025-Q4

2026-Q1

Latest value

BlackRock, Inc.

1.0M

1.1M

1.2M

$13M

MAK CAPITAL ONE LLC

—

93K

816K

919K

$10M

Prescott Group Capital Management, L.L.C.

747K

777K

$8M

VANGUARD CAPITAL MANAGEMENT LLC

—

759K

$8M

GEODE CAPITAL MANAGEMENT, LLC

327K

393K

422K

421K

423K

433K

$5M

HEARTLAND ADVISORS INC

400K

455K

481K

458K

400K

$4M

DIAMOND HILL CAPITAL MANAGEMENT INC

316K

417K

394K

402K

387K

356K

$4M

STATE STREET CORP

183K

192K

288K

298K

312K

336K

$4M

Potomac Capital Management, Inc.

—

342K

297K

$3M

GROUP ONE TRADING LLC

—

721

248K

$3M

DIMENSIONAL FUND ADVISORS LP

112K

124K

152K

157K

165K

164K

$2M

GOLDMAN SACHS GROUP INC

40K

25K

—

64K

72K

143K

$2M

NORTHERN TRUST CORP

121K

139K

134K

135K

124K

130K

$1M

North Star Investment Management Corp.

—

121K

$1M

MYDA Advisors LLC

225K

200K

169K

—

100K

120K

$1M

Institutional footprint by quarter

Line breaks are honest gaps — quarters with no 13F record, or a suppressed % — never interpolated. % of shares outstanding uses today's share count for every quarter (the only count stored).

Quarter	Holders	Shares held	% shares out	Value held
2026-Q1	85	7,569,045	40.8%	$81M
2025-Q4	84	7,876,466	42.4%

Short interest has its own tab now — open SI →

PESI US Equity☆

Institutional ownership· 13F filers holding PESI · 2026-Q1 methodology → sources →

Top holders

Holder trends· top 15 holders · shares held over 6 quarters

Institutional footprint by quarter

Institutional ownership· 13F filers holding PESI · 2026-Q1 methodology → sources →

Top holders

Holder trends· top 15 holders · shares held over 6 quarters

Institutional footprint by quarter

PESI US Equity