Form 8-K/A

8-K/A — PERMA FIX ENVIRONMENTAL SERVICES INC

Accession: 0001493152-26-043859

Filed: 2026-09-23

Period: 2026-09-22

CIK: 0000891532

SIC: 4955 (HAZARDOUS WASTE MANAGEMENT)

Item: Other Events

Item: Financial Statements and Exhibits

Documents

8-K/A — form8-ka.htm (Primary)

EX-99.1 (ex99-1.htm)

GRAPHIC (ex99-1_001.jpg)

GRAPHIC (ex99-1_002.jpg)

GRAPHIC (ex99-1_003.jpg)

GRAPHIC (ex99-1_004.jpg)

GRAPHIC (ex99-1_005.jpg)

GRAPHIC (ex99-1_006.jpg)

GRAPHIC (ex99-1_007.jpg)

GRAPHIC (ex99-1_008.jpg)

GRAPHIC (ex99-1_009.jpg)

GRAPHIC (ex99-1_010.jpg)

GRAPHIC (ex99-1_011.jpg)

GRAPHIC (ex99-1_012.jpg)

GRAPHIC (ex99-1_013.jpg)

GRAPHIC (ex99-1_014.jpg)

GRAPHIC (ex99-1_015.jpg)

GRAPHIC (ex99-1_016.jpg)

GRAPHIC (ex99-1_017.jpg)

GRAPHIC (ex99-1_018.jpg)

GRAPHIC (ex99-1_019.jpg)

XML — IDEA: XBRL DOCUMENT (R1.htm)

8-K/A

8-K/A (Primary)

Filename: form8-ka.htm · Sequence: 1

true

0000891532

2026-09-22

iso4217:USD

xbrli:shares

iso4217:USD

xbrli:shares

UNITED

STATES

SECURITIES

AND EXCHANGE COMMISSION

Washington,

D.C. 20549

FORM

8-K/A

Amendment

No. 1

CURRENT

REPORT

PURSUANT

TO SECTION 13 OR 15(d) OF THE

SECURITIES

EXCHANGE ACT OF 1934

Date

of Report (Date of earliest event reported) September 22, 2026

PERMA FIX ENVIRONMENTAL SERVICES INC

PERMA-FIX

ENVIRONMENTAL SERVICES, INC.

(Exact

name of registrant as specified in its charter)

Delaware

1-11596

58-1954497

(State or other jurisdiction

of incorporation)

(Commission

File Number)

(IRS Employer

Identification No.)

8302

Dunwoody Place, Suite 250, Atlanta, Georgia

30350

(Address

of principal executive offices)

(Zip

Code)

Registrant’s

telephone number, including area code: (770) 587-9898

Not

applicable

(Former

name or former address, if changed since last report)

Check

the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under

any of the following provisions:

☐

Written

communications pursuant to Rule 425 under the Securities Act

☐

Soliciting

material pursuant to Rule 14a-12 under the Exchange Act

☐

Pre-commencement

communications pursuant to Rule 14d-2(b) under the Exchange Act

☐

Pre-commencement

communications pursuant to Rule 13e-4(c) under the Exchange Act

Securities

registered pursuant to Section 12(b) of the Act:

Title

of Each Class

Trading

Symbol

Name

of each exchange on which registered

Common

Stock, Par Value, $.001 Per Share

PESI

Nasdaq

Capital Market

Indicate

by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 or Rule 12b-2

of the Securities Exchange Act of 1934.

Emerging

growth company ☐

an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying

with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act ☐

Item

8.01 – Other Events.

September 22, 2026, Perma-Fix Environmental Services, Inc. (the “Company”) filed a Current Report on Form 8-K that included

as Exhibit 99.1 the Company’s “Investor Presentation, September 2026” (the “Original Presentation”). The

Company is filing this Current Report on Form 8-K/A to provide a revised version of that presentation (the “Revised Presentation”),

which is attached to this Report as Exhibit 99.1 and incorporated herein by reference.

The

Revised Presentation revises the Company’s presentation of the Direct-Feed Low-Activity Waste (“DFLAW”) program on

slides 9 and 16. Following investor inquiries, the Company concluded that the Original Presentation did not adequately portray the values

it was intended to present. Slide 9 now states that the Company continues to reference the U.S. Department of Energy’s (“DOE”)

estimate of 8,000 cubic meters of effluent generated annually at the site, which the Company estimates would equate to approximately

$70 million in annual DFLAW-related revenue at full operation, that DOE has not revised that estimate, and that timing depends on how

quickly DFLAW ramps toward design capacity.

slide 16, the DFLAW lines have been revised to present combined DFLAW waste (Effluent Management Facility (“EMF”) effluent

and dry waste) of approximately 4,000 cubic meters, estimated at approximately $35 million of annual revenue, based on an assumption

that DFLAW reaches 50% of production capacity in 2027. The DFLAW - EMF line is a component of that amount and is not additive, and production

levels at DFLAW could vary and are not known at this time. The 200 East lines have been combined, and the initial 200 East amount has

been revised to approximately $28.8 million to reflect a consistent pricing assumption across the volumes shown. The table states that

revenue assumes base rate pricing for standard waste, with waste having higher organics, metals or radioactivity carrying higher pricing.

As revised, the 2028 illustrative run rate shown on slide 16 is approximately $97.4 million.

The

Revised Presentation supersedes the Original Presentation and is posted to the Company’s website.

The

Revised Presentation contains forward-looking statements, which are subject to the cautionary statements included in the Revised Presentation

and the risk factors described in the Company’s filings with the Securities and Exchange Commission.

Item

9.01. Financial Statements and Exhibits

(d)

Exhibits.

Exhibit

Description

99.1

Perma-Fix Environmental Services, Inc. Investor Presentation, September 2026 (Revised).

104

Cover

Page Interactive Data File (embedded within the Inline XBRL document).

Signatures

Pursuant

to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by

the undersigned hereunto duly authorized.

Dated:

September 23, 2026

PERMA-FIX

ENVIRONMENTAL SERVICES, INC.

By:

/s/

Ben Naccarato

Ben

Naccarato

Executive

Vice President and

Chief

Financial Officer

EX-99.1

Filename: ex99-1.htm · Sequence: 2

Exhibit 99.1

GRAPHIC

Filename: ex99-1_001.jpg · Sequence: 3

Binary file (88900 bytes)

Download ex99-1_001.jpg

GRAPHIC

Filename: ex99-1_002.jpg · Sequence: 4

Binary file (249267 bytes)

Download ex99-1_002.jpg

GRAPHIC

Filename: ex99-1_003.jpg · Sequence: 5

Binary file (199277 bytes)

Download ex99-1_003.jpg

GRAPHIC

Filename: ex99-1_004.jpg · Sequence: 6

Binary file (234473 bytes)

Download ex99-1_004.jpg

GRAPHIC

Filename: ex99-1_005.jpg · Sequence: 7

Binary file (187370 bytes)

Download ex99-1_005.jpg

GRAPHIC

Filename: ex99-1_006.jpg · Sequence: 8

Binary file (170108 bytes)

Download ex99-1_006.jpg

GRAPHIC

Filename: ex99-1_007.jpg · Sequence: 9

Binary file (103467 bytes)

Download ex99-1_007.jpg

GRAPHIC

Filename: ex99-1_008.jpg · Sequence: 10

Binary file (180317 bytes)

Download ex99-1_008.jpg

GRAPHIC

Filename: ex99-1_009.jpg · Sequence: 11

Binary file (239908 bytes)

Download ex99-1_009.jpg

GRAPHIC

Filename: ex99-1_010.jpg · Sequence: 12

Binary file (153846 bytes)

Download ex99-1_010.jpg

GRAPHIC

Filename: ex99-1_011.jpg · Sequence: 13

Binary file (170991 bytes)

Download ex99-1_011.jpg

GRAPHIC

Filename: ex99-1_012.jpg · Sequence: 14

Binary file (174836 bytes)

Download ex99-1_012.jpg

GRAPHIC

Filename: ex99-1_013.jpg · Sequence: 15

Binary file (91738 bytes)

Download ex99-1_013.jpg

GRAPHIC

Filename: ex99-1_014.jpg · Sequence: 16

Binary file (137380 bytes)

Download ex99-1_014.jpg

GRAPHIC

Filename: ex99-1_015.jpg · Sequence: 17

Binary file (132066 bytes)

Download ex99-1_015.jpg

GRAPHIC

Filename: ex99-1_016.jpg · Sequence: 18

Binary file (206695 bytes)

Download ex99-1_016.jpg

GRAPHIC

Filename: ex99-1_017.jpg · Sequence: 19

Binary file (164682 bytes)

Download ex99-1_017.jpg

GRAPHIC

Filename: ex99-1_018.jpg · Sequence: 20

Binary file (195428 bytes)

Download ex99-1_018.jpg

GRAPHIC

Filename: ex99-1_019.jpg · Sequence: 21

Binary file (88562 bytes)

Download ex99-1_019.jpg

XML — IDEA: XBRL DOCUMENT

XML

Filename: R1.htm · Sequence: 26

v3.26.3

Cover

Sep. 22, 2026

Cover [Abstract]

Document Type

8-K/A

Amendment Flag

true

Amendment Description

Amendment

No. 1

Document Period End Date

Sep. 22, 2026

Entity File Number

1-11596

Entity Registrant Name

PERMA FIX ENVIRONMENTAL SERVICES INC

Entity Central Index Key

0000891532

Entity Tax Identification Number

58-1954497

Entity Incorporation, State or Country Code

Entity Address, Address Line One

8302

Dunwoody Place

Entity Address, Address Line Two

Suite 250

Entity Address, City or Town

Atlanta

Entity Address, State or Province

Entity Address, Postal Zip Code

30350

City Area Code

(770)

Local Phone Number

587-9898

Written Communications

false

Soliciting Material

false

Pre-commencement Tender Offer

false

Pre-commencement Issuer Tender Offer

false

Title of 12(b) Security

Common

Stock, Par Value, $.001 Per Share

Trading Symbol

PESI

Security Exchange Name

NASDAQ

Entity Emerging Growth Company

false

Entity Information, Former Legal or Registered Name

Not

applicable

- Definition

Description of changes contained within amended document.

+ References

No definition available.

+ Details

Name:

dei_AmendmentDescription

Namespace Prefix:

dei_

Data Type:

xbrli:stringItemType

Balance Type:

Period Type:

duration

- Definition

Boolean flag that is true when the XBRL content amends previously-filed or accepted submission.

+ References

No definition available.

+ Details

Name:

dei_AmendmentFlag

Namespace Prefix:

dei_

Data Type:

xbrli:booleanItemType

Balance Type:

Period Type:

duration

- Definition

Area code of city

+ References

No definition available.

+ Details

Name:

dei_CityAreaCode

Namespace Prefix:

dei_

Data Type:

xbrli:normalizedStringItemType

Balance Type:

Period Type:

duration

- Definition

Cover page.

+ References

No definition available.

+ Details

Name:

dei_CoverAbstract

Namespace Prefix:

dei_

Data Type:

xbrli:stringItemType

Balance Type:

Period Type:

duration

- Definition

For the EDGAR submission types of Form 8-K: the date of the report, the date of the earliest event reported; for the EDGAR submission types of Form N-1A: the filing date; for all other submission types: the end of the reporting or transition period. The format of the date is YYYY-MM-DD.

+ References

No definition available.

+ Details

Name:

dei_DocumentPeriodEndDate

Namespace Prefix:

dei_

Data Type:

xbrli:dateItemType

Balance Type:

Period Type:

duration

- Definition

The type of document being provided (such as 10-K, 10-Q, 485BPOS, etc). The document type is limited to the same value as the supporting SEC submission type, or the word 'Other'.

+ References

No definition available.

+ Details

Name:

dei_DocumentType

Namespace Prefix:

dei_

Data Type:

dei:submissionTypeItemType

Balance Type:

Period Type:

duration

- Definition

Address Line 1 such as Attn, Building Name, Street Name

+ References

No definition available.

+ Details

Name:

dei_EntityAddressAddressLine1

Namespace Prefix:

dei_

Data Type:

xbrli:normalizedStringItemType

Balance Type:

Period Type:

duration

- Definition

Address Line 2 such as Street or Suite number

+ References

No definition available.

+ Details

Name:

dei_EntityAddressAddressLine2

Namespace Prefix:

dei_

Data Type:

xbrli:normalizedStringItemType

Balance Type:

Period Type:

duration

- Definition

Name of the City or Town

+ References

No definition available.

+ Details

Name:

dei_EntityAddressCityOrTown

Namespace Prefix:

dei_

Data Type:

xbrli:normalizedStringItemType

Balance Type:

Period Type:

duration

- Definition

Code for the postal or zip code

+ References

No definition available.

+ Details

Name:

dei_EntityAddressPostalZipCode

Namespace Prefix:

dei_

Data Type:

xbrli:normalizedStringItemType

Balance Type:

Period Type:

duration

- Definition

Name of the state or province.

+ References

No definition available.

+ Details

Name:

dei_EntityAddressStateOrProvince

Namespace Prefix:

dei_

Data Type:

dei:stateOrProvinceItemType

Balance Type:

Period Type:

duration

- Definition

A unique 10-digit SEC-issued value to identify entities that have filed disclosures with the SEC. It is commonly abbreviated as CIK.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 12

-Subsection b-2

+ Details

Name:

dei_EntityCentralIndexKey

Namespace Prefix:

dei_

Data Type:

dei:centralIndexKeyItemType

Balance Type:

Period Type:

duration

- Definition

Indicate if registrant meets the emerging growth company criteria.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 12

-Subsection b-2

+ Details

Name:

dei_EntityEmergingGrowthCompany

Namespace Prefix:

dei_

Data Type:

xbrli:booleanItemType

Balance Type:

Period Type:

duration

- Definition

Commission file number. The field allows up to 17 characters. The prefix may contain 1-3 digits, the sequence number may contain 1-8 digits, the optional suffix may contain 1-4 characters, and the fields are separated with a hyphen.

+ References

No definition available.

+ Details

Name:

dei_EntityFileNumber

Namespace Prefix:

dei_

Data Type:

dei:fileNumberItemType

Balance Type:

Period Type:

duration

- Definition

Two-character EDGAR code representing the state or country of incorporation.

+ References

No definition available.

+ Details

Name:

dei_EntityIncorporationStateCountryCode

Namespace Prefix:

dei_

Data Type:

dei:edgarStateCountryItemType

Balance Type:

Period Type:

duration

- Definition

Former Legal or Registered Name of an entity

+ References

No definition available.

+ Details

Name:

dei_EntityInformationFormerLegalOrRegisteredName

Namespace Prefix:

dei_

Data Type:

xbrli:normalizedStringItemType

Balance Type:

Period Type:

duration

- Definition

The exact name of the entity filing the report as specified in its charter, which is required by forms filed with the SEC.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 12

-Subsection b-2

+ Details

Name:

dei_EntityRegistrantName

Namespace Prefix:

dei_

Data Type:

xbrli:normalizedStringItemType

Balance Type:

Period Type:

duration

- Definition

The Tax Identification Number (TIN), also known as an Employer Identification Number (EIN), is a unique 9-digit value assigned by the IRS.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 12

-Subsection b-2

+ Details

Name:

dei_EntityTaxIdentificationNumber

Namespace Prefix:

dei_

Data Type:

dei:employerIdItemType

Balance Type:

Period Type:

duration

- Definition

Local phone number for entity.

+ References

No definition available.

+ Details

Name:

dei_LocalPhoneNumber

Namespace Prefix:

dei_

Data Type:

xbrli:normalizedStringItemType

Balance Type:

Period Type:

duration

- Definition

Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 13e

-Subsection 4c

+ Details

Name:

dei_PreCommencementIssuerTenderOffer

Namespace Prefix:

dei_

Data Type:

xbrli:booleanItemType

Balance Type:

Period Type:

duration

- Definition

Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 14d

-Subsection 2b

+ Details

Name:

dei_PreCommencementTenderOffer

Namespace Prefix:

dei_

Data Type:

xbrli:booleanItemType

Balance Type:

Period Type:

duration

- Definition

Title of a 12(b) registered security.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 12

-Subsection b

+ Details

Name:

dei_Security12bTitle

Namespace Prefix:

dei_

Data Type:

dei:securityTitleItemType

Balance Type:

Period Type:

duration

- Definition

Name of the Exchange on which a security is registered.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 12

-Subsection d1-1

+ Details

Name:

dei_SecurityExchangeName

Namespace Prefix:

dei_

Data Type:

dei:edgarExchangeCodeItemType

Balance Type:

Period Type:

duration

- Definition

Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as soliciting material pursuant to Rule 14a-12 under the Exchange Act.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 14a

-Subsection 12

+ Details

Name:

dei_SolicitingMaterial

Namespace Prefix:

dei_

Data Type:

xbrli:booleanItemType

Balance Type:

Period Type:

duration

- Definition

Trading symbol of an instrument as listed on an exchange.

+ References

No definition available.

+ Details

Name:

dei_TradingSymbol

Namespace Prefix:

dei_

Data Type:

dei:tradingSymbolItemType

Balance Type:

Period Type:

duration

- Definition

Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as written communications pursuant to Rule 425 under the Securities Act.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Securities Act

-Number 230

-Section 425

+ Details

Name:

dei_WrittenCommunications

Namespace Prefix:

dei_

Data Type:

xbrli:booleanItemType

Balance Type:

Period Type:

duration