MAK Capital holds 4.8% Perma-Fix Environmental stake

PERMA FIX ENVIRONMENTAL SERVICES INC (PESI) received Amendment No. 2 to a Schedule 13G from MAK Capital Fund LP, MAK Capital One LLC, and Michael A. Kaufman reporting their beneficial ownership of the company’s common stock.

Rhea-AI Filing Summary

PERMA FIX ENVIRONMENTAL SERVICES INC (PESI) received Amendment No. 2 to a Schedule 13G from MAK Capital Fund LP, MAK Capital One LLC, and Michael A. Kaufman reporting their beneficial ownership of the company’s common stock. The reporting persons collectively beneficially own 1,016,047 shares, representing 4.8% of the common stock outstanding.

All 1,016,047 shares are held with shared voting and shared dispositive power, with no sole voting or dispositive power reported. The percentage is calculated using 21,218,351 shares outstanding as of August 7, 2026. The filing indicates the group now reports ownership of 5 percent or less of the class.

Key Figures

Shares beneficially owned: 1,016,047 shares of Common Stock Percent of class: 4.8% Shares outstanding: 21,218,351 shares of Common Stock +4 more

7 metrics

Shares beneficially owned 1,016,047 shares of Common Stock Beneficially owned by the reporting persons as of 08/28/2026

Percent of class 4.8% Portion of PERMA FIX ENVIRONMENTAL SERVICES INC common stock beneficially owned

Shares outstanding 21,218,351 shares of Common Stock Shares outstanding as of August 7, 2026, used to calculate ownership percentage

Shared voting power 1,016,047 shares Number of shares over which reporting persons have shared power to vote

Sole voting power 0 shares Number of shares over which reporting persons have sole power to vote

Shared dispositive power 1,016,047 shares Number of shares over which reporting persons have shared power to dispose

Sole dispositive power 0 shares Number of shares over which reporting persons have sole power to dispose

Key Terms

beneficially owned, shared voting power, shared dispositive power, Schedule 13G

4 terms

beneficially owned financial

"The calculation is based upon 1,016,047 shares of Common Stock beneficially owned"

Beneficially owned describes securities or assets where a person has the economic rights and control—such as the right to receive dividends and to direct voting—even if legal title is held in another name. Think of it like having the keys and using a car that’s registered to someone else: you get the benefits and make decisions. Investors care because beneficial ownership reveals who truly controls value and voting power, affecting corporate decisions and takeover dynamics.

shared voting power financial

"Shared Voting Power 1,016,047.00"

Shared voting power occurs when two or more parties jointly have the right to vote or decide how a block of company shares is cast, like co-owners who must agree before moving a piece of furniture. Investors care because who controls voting rights affects board elections, major corporate decisions and takeover outcomes, and shared control can alter regulatory disclosures and the practical influence any holder has over a company’s direction and value.

shared dispositive power financial

"Shared Dispositive Power 1,016,047.00"

Schedule 13G regulatory

"This Amendment No. 2 to is being filed by"

A Schedule 13G is a formal document that investors file with the government when they acquire a large ownership stake in a company, usually for investment purposes rather than control. It helps keep the public informed about who owns significant parts of a company's shares, which can influence how the company is managed and how investors make decisions. Filing this schedule is important for transparency and understanding the ownership landscape of publicly traded companies.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What ownership stake in PESI is reported in this Schedule 13G/A Amendment No. 2?

The reporting persons disclose beneficial ownership of 1,016,047 shares of PERMA FIX ENVIRONMENTAL SERVICES INC common stock, representing 4.8% of the outstanding common stock, based on 21,218,351 shares outstanding as of August 7, 2026.

Who are the reporting persons in this PESI Schedule 13G/A filing?

The filing is made jointly by MAK Capital Fund LP, MAK Capital One L.L.C., and Michael A. Kaufman, referred to collectively as the reporting persons with respect to their beneficial ownership of PERMA FIX ENVIRONMENTAL SERVICES INC common stock.

What voting and dispositive powers over PESI shares do the filers report?

The reporting persons disclose 0 shares with sole voting power and 1,016,047 shares with shared voting power. They also report 0 shares with sole dispositive power and 1,016,047 shares with shared dispositive power over PESI common stock.

How is the 4.8% ownership in PESI calculated in this filing?

The 4.8% figure is based on 1,016,047 shares of PERMA FIX ENVIRONMENTAL SERVICES INC common stock beneficially owned as of August 28, 2026 and a total of 21,218,351 shares outstanding as of August 7, 2026, as reported in the company’s Form 10-Q.

Does this Schedule 13G/A indicate the filers own 5% or less of PESI?

Yes. The filing’s Item 5 states Ownership of 5 percent or less of a class, and the reported beneficial ownership is 4.8% of PERMA FIX ENVIRONMENTAL SERVICES INC’s outstanding common stock.

What security of PESI is covered by this Schedule 13G/A?

The filing covers PERMA FIX ENVIRONMENTAL SERVICES INC’s Common Stock, $0.001 par value per share, identified by CUSIP 714157203, with the reporting persons disclosing their beneficial ownership and related voting and dispositive powers.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 08/28/2026 - 02:31 PM EDT Accepted by SEC EDGAR 08/28/2026 - 02:31 PM EDT Learn about SEC filing dates

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 2)

PERMA FIX ENVIRONMENTAL SERVICES INC

(Name of Issuer)

Common Stock, $0.001 par value per share

(Title of Class of Securities)

714157203

(CUSIP Number)

08/24/2026

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

schemaVersion:

SCHEDULE 13G

CUSIP Number(s): 714157203

1

Names of Reporting Persons

MAK CAPITAL ONE LLC

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 1,016,047.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 1,016,047.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,016,047.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

4.8 %

12

Type of Reporting Person (See Instructions)

IA

Comment for Type of Reporting Person: The calculation is based upon 1,016,047 shares of Common Stock beneficially owned as of 08/28/2026 and a total of 21,218,351 shares of Common Stock, $0.001 par value per share, outstanding as of August 7, 2026, as reported by the Issuer in its Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission on August 12, 2026.

SCHEDULE 13G

CUSIP Number(s): 714157203

1

Names of Reporting Persons

MAK Capital Fund LP

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

BERMUDA

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 1,016,047.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 1,016,047.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,016,047.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

4.8 %

12

Type of Reporting Person (See Instructions)

PN

Comment for Type of Reporting Person: The calculation is based upon 1,016,047 shares of Common Stock beneficially owned as of 08/28/2026 and a total of 21,218,351 shares of Common Stock, $0.001 par value per share, outstanding as of August 7, 2026, as reported by the Issuer in its Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission on August 12, 2026.

SCHEDULE 13G

CUSIP Number(s): 714157203

1

Names of Reporting Persons

Kaufman Michael A

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 1,016,047.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 1,016,047.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,016,047.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

4.8 %

12

Type of Reporting Person (See Instructions)

IN

Comment for Type of Reporting Person: The calculation is based upon 1,016,047 shares of Common Stock beneficially owned as of 08/28/2026 and a total of 21,218,351 shares of Common Stock, $0.001 par value per share, outstanding as of August 7, 2026, as reported by the Issuer in its Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission on August 12, 2026.

SCHEDULE 13G

Item 1.
(a)	Name of issuer: PERMA FIX ENVIRONMENTAL SERVICES INC
(b)	Address of issuer's principal executive offices: 8302 DUNWOODY PLACE, SUITE 250, ATLANTA, GEORGIA, 30350
Item 2.
(a)	Name of person filing: This Amendment No. 2 to Schedule 13G is being filed by: i. MAK Capital Fund LP ("MAK Fund") ii. MAK Capital One L.L.C. ("MAK Capital"); and iii. Michael A. Kaufman ("Mr. Kaufman," and collectively with MAK Fund and MAK Capital, the "Reporting Persons")
(b)	Address or principal business office or, if none, residence: The principal business address of (i) MAK Fund is c/o Wakefield Quin, Victoria Place, 31 Victoria Street, Bermuda; and (ii) MAK Capital and Mr. Kaufman is 590 Madison Avenue, 31st Floor, New York, NY 10022.
(c)	Citizenship: MAK Capital Fund LP is a Bermuda limited partnership. MAK Capital One L.L.C. is a Delaware limited liability company. Mr. Kaufman is a United States citizen.
(d)	Title of class of securities: Common Stock, $0.001 par value per share
(e)	CUSIP No.: 714157203
Item 3.	If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)	Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)	Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)	Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)	Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)	An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)	An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)	A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)	A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)	A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)	A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution:
(k)	Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.	Ownership
(a)	Amount beneficially owned: 1,016,047
(b)	Percent of class: 4.8% The calculation is based upon 1,016,047 shares of Common Stock beneficially owned as of 08/28/2026 and a total of 21,218,351 shares of Common Stock, $0.001 par value per share, outstanding as of August 7, 2026, as reported by the Issuer in its Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission on August 12, 2026.
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 0
	(ii) Shared power to vote or to direct the vote: 1,016,047
	(iii) Sole power to dispose or to direct the disposition of: 0
	(iv) Shared power to dispose or to direct the disposition of: 1,016,047
Item 5.	Ownership of 5 Percent or Less of a Class.
	Ownership of 5 percent or less of a class
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	Not Applicable
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	Not Applicable
Item 8.	Identification and Classification of Members of the Group.
	Not Applicable
Item 9.	Notice of Dissolution of Group.
	Not Applicable

Item 10.

Certifications:

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under § 240.14a-11.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

MAK CAPITAL ONE LLC

Signature:	/s/ Michael A. Kaufman
Name/Title:	Managing Member
Date:	08/28/2026

MAK Capital Fund LP

Signature:	/s/ Michael A. Kaufman
Name/Title:	Managing Member
Date:	08/28/2026

Kaufman Michael A

Signature:	/s/ Michael A. Kaufman
Name/Title:	Michael A. Kaufman
Date:	08/28/2026