$PESI

$13.66 +$0.74 (5.73%) Close

$PESI Overview Financial Statements SEC Filings Executives News Red Flags Capital Raising Ownership Insider Transactions Congressional Trades

Ownership

13F as of Q2 2026 · 21.2M shares outstanding

Who owns PESI?

By type of holder

Institutions 43.9% Insiders 8.7% Everyone else 47.4%

Concentration Top 10 holders own 33.5%

BlackRock, Inc. 5.9% · Mak Capital One LLC 4.9%

Institutional ownership

43.9%

+8.2 pts vs last qtr

Institutional holders

+2 vs last qtr

Net shares bought

+1.7M

by institutions in Q2 2026

New / sold out

14 / 12

positions opened vs closed

How is ownership changing?

Institutions, last 8 quarters

Biggest buyers in Q2 2026

Kennedy Capital Management LLC NEW +610.9K
Diamond Hill Capital Management, LLC (Investment Advisor) +286.6K

Biggest sellers in Q2 2026

Group One Trading LLC −125.1K
D. E. Shaw & Co., Inc. −38.1K

Who is planning to sell?

No insider has filed a notice of proposed sale (Form 144) for Perma-Fix Environmental Services Inc in the last 12 months.

Is your stake being diluted?

Diluted share count, FY2016–FY2025

+59.1%

+5.29% a year

Each share's claim on the business

−37.1%

shrank without buying or selling a share

Spent on buybacks vs paid in stock

— vs $3.29M

over 10 fiscal years

Diluted shares, split-adjusted

Buybacks Stock-based comp

How patient are the owners?

Institutional shares by how long they've been held

5+ years42% 3–5 years2% 1–3 years32% Under 1 year23%

Quarterly turnover

15.9%

of institutional shares changed hands

Top 10 managers, median time held

5 years

Super Investors

Investment managers reporting PESI on Form 13F

Holder	Shares	% of company	Change vs last qtr	Held since	% of their book
B BlackRock, Inc.	1.3M	5.90%	+82.5K (+7.0%)	≤2021	0.0%
Shares held by quarter Peak holding1.3M (Q2'26) Change over 8 quarters+245.9K Share of the company5.900% BlackRock, Inc.'s full portfolio →
MC Mak Capital One LLC	1.0M	4.87%	+114.3K (+12.4%)	2025	2.1%
Shares held by quarter Peak holding1.0M (Q2'26) Change over 8 quarters+1.0M Share of the company4.870% Mak Capital One LLC's full portfolio →

BlackRock, Inc.

1.3M

% of company

5.90%

Change vs last qtr

+82.5K (+7.0%)

Held since

≤2021

Mak Capital One LLC

1.0M

% of company

4.87%

Change vs last qtr

+114.3K (+12.4%)

Held since

2025

28 more super investors behind a free account

See every manager holding Perma-Fix Environmental Services Inc, how their position has changed, and how long they've held it.

Institutional Funds

Mutual funds and ETFs reporting PESI on Form N-PORT; together they hold 16.1% of the company

Fund	Position value	Shares	% of company	% of the fund	As of
VT Vanguard Total Stock Market Index Fund Vanguard Index Funds	$8.54M	597.8K	2.82%	0.00%	June 30, 2026
IR iShares Russell 2000 ETF iShares Trust	$6.58M	460.2K	2.17%	0.01%	June 30, 2026

Vanguard Total Stock Market Index Fund

Vanguard Index Funds

Position value

$8.54M

% of company

2.82%

% of the fund

0.00%

As of

June 30, 2026

iShares Russell 2000 ETF

iShares Trust

Position value

$6.58M

% of company

2.17%

% of the fund

0.01%

As of

June 30, 2026

23 more funds behind a free account

See every fund holding Perma-Fix Environmental Services Inc and how much of the fund the position is.

Insiders and 5%+ holders

From Forms 3/4/5 and Schedules 13D/G

Holder	Shares	% of company	Change vs last qtr	8 quarters	Held since	% of their book
CL Centofanti Louis F Insider	647.2K	3.05%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company3.050% Centofanti Louis F's insider activity →
RJ Reeder Joe Insider	349.5K	1.65%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company1.650% Reeder Joe's insider activity →

Centofanti Louis F

Insider

647.2K

% of company

3.05%

Change vs last qtr

—

Held since

—

Reeder Joe

Insider

349.5K

% of company

1.65%

Change vs last qtr

—

Held since

—

10 more holders behind a free account

See every insider and 5%+ holder of Perma-Fix Environmental Services Inc.

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