Form 8-K

8-K — FUEL TECH, INC.

Accession: 0001437749-26-030744

Filed: 2026-09-18

Period: 2026-09-14

CIK: 0000846913

SIC: 3564 (INDUSTRIAL & COMMERCIAL FANS & BLOWERS & AIR PURIFYING EQUIP)

Item: Regulation FD Disclosure

Item: Financial Statements and Exhibits

Documents

8-K — ftek20260916_8k.htm (Primary)

EX-99.1 — EXHIBIT 99.1 (ex_1017191_source.htm)

GRAPHIC (slide_page01.jpg)

GRAPHIC (slide_page02.jpg)

GRAPHIC (slide_page03.jpg)

GRAPHIC (slide_page04.jpg)

GRAPHIC (slide_page05.jpg)

GRAPHIC (slide_page06.jpg)

GRAPHIC (slide_page07.jpg)

GRAPHIC (slide_page08.jpg)

GRAPHIC (slide_page09.jpg)

GRAPHIC (slide_page10.jpg)

GRAPHIC (slide_page11.jpg)

GRAPHIC (slide_page12.jpg)

GRAPHIC (slide_page13.jpg)

GRAPHIC (slide_page14.jpg)

GRAPHIC (slide_page15.jpg)

GRAPHIC (slide_page16.jpg)

GRAPHIC (slide_page17.jpg)

GRAPHIC (slide_page18.jpg)

GRAPHIC (slide_page19.jpg)

GRAPHIC (slide_page20.jpg)

XML — IDEA: XBRL DOCUMENT (R1.htm)

8-K — FORM 8-K

8-K (Primary)

Filename: ftek20260916_8k.htm · Sequence: 1

ftek20260916_8k.htm

false

0000846913

2026-09-14

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

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 14, 2026

FUEL TECH, INC.

(Exact name of registrant as specified in its charter)

Delaware

(State or other jurisdiction

of incorporation)

001-33059

(Commission

File Number)

20-5657551

(IRS Employer

Identification No.)

Fuel Tech, Inc.

27601 Bella Vista Parkway

Warrenville, IL 60555-1617

630-845-4500

(Address and telephone number of principal executive offices)

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

Title of each class

Trading Symbol(s)

Name of each exchange on which registered

Common Stock

FTEK

NASDAQ Capital Market

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 provision:

☐

Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐

Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐

Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐

Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Emerging growth company ☐

If 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 7.01.

Regulation FD Disclosure

On September 14, 2026 Fuel Tech, Inc., a Delaware corporation, posted on its website an updated corporate presentation, a copy of which is attached hereto as Exhibit 99.1 and incorporated herein by reference.

The foregoing information, including the presentation attached hereto as an exhibit, is being furnished pursuant to Item 7.01 of this Current Report and shall not be deemed “filed” for the purposes of Section 18 of the Securities and Exchange Act of 1934, as amended, or otherwise subject to the liabilities of that Section. This information shall not be incorporated by reference into any registration statement pursuant to the Securities Act of 1933, as amended.

Item 9.01

Financial Statements and Exhibits

(d)

Exhibits

99.1

Fuel Tech, Inc. Corporate Presentation dated September 14, 2026.

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.

Fuel Tech, Inc.

(Registrant)

By:

/s/ Bradley W. Johnson

Bradley W. Johnson

Date: September 18, 2026

Vice President, General Counsel and Secretary

EX-99.1 — EXHIBIT 99.1

EX-99.1

Filename: ex_1017191_source.htm · Sequence: 2

ex_1017191_source.htm

Exhibit 99.1

GRAPHIC

Filename: slide_page01.jpg · Sequence: 7

Binary file (90992 bytes)

Download slide_page01.jpg

GRAPHIC

Filename: slide_page02.jpg · Sequence: 8

Binary file (95222 bytes)

Download slide_page02.jpg

GRAPHIC

Filename: slide_page03.jpg · Sequence: 9

Binary file (69458 bytes)

Download slide_page03.jpg

GRAPHIC

Filename: slide_page04.jpg · Sequence: 10

Binary file (60310 bytes)

Download slide_page04.jpg

GRAPHIC

Filename: slide_page05.jpg · Sequence: 11

Binary file (66961 bytes)

Download slide_page05.jpg

GRAPHIC

Filename: slide_page06.jpg · Sequence: 12

Binary file (63131 bytes)

Download slide_page06.jpg

GRAPHIC

Filename: slide_page07.jpg · Sequence: 13

Binary file (77009 bytes)

Download slide_page07.jpg

GRAPHIC

Filename: slide_page08.jpg · Sequence: 14

Binary file (64371 bytes)

Download slide_page08.jpg

GRAPHIC

Filename: slide_page09.jpg · Sequence: 15

Binary file (60941 bytes)

Download slide_page09.jpg

GRAPHIC

Filename: slide_page10.jpg · Sequence: 16

Binary file (69388 bytes)

Download slide_page10.jpg

GRAPHIC

Filename: slide_page11.jpg · Sequence: 17

Binary file (69390 bytes)

Download slide_page11.jpg

GRAPHIC

Filename: slide_page12.jpg · Sequence: 18

Binary file (77437 bytes)

Download slide_page12.jpg

GRAPHIC

Filename: slide_page13.jpg · Sequence: 19

Binary file (83138 bytes)

Download slide_page13.jpg

GRAPHIC

Filename: slide_page14.jpg · Sequence: 20

Binary file (80792 bytes)

Download slide_page14.jpg

GRAPHIC

Filename: slide_page15.jpg · Sequence: 21

Binary file (46865 bytes)

Download slide_page15.jpg

GRAPHIC

Filename: slide_page16.jpg · Sequence: 22

Binary file (59154 bytes)

Download slide_page16.jpg

GRAPHIC

Filename: slide_page17.jpg · Sequence: 23

Binary file (56405 bytes)

Download slide_page17.jpg

GRAPHIC

Filename: slide_page18.jpg · Sequence: 24

Binary file (63328 bytes)

Download slide_page18.jpg

GRAPHIC

Filename: slide_page19.jpg · Sequence: 25

Binary file (49361 bytes)

Download slide_page19.jpg

GRAPHIC

Filename: slide_page20.jpg · Sequence: 26

Binary file (62941 bytes)

Download slide_page20.jpg

XML — IDEA: XBRL DOCUMENT

XML

Filename: R1.htm · Sequence: 28

v3.26.3

Document And Entity Information

Sep. 14, 2026

Document Information [Line Items]

Entity, Registrant Name

FUEL TECH, INC.

Document, Type

8-K

Document, Period End Date

Sep. 14, 2026

Entity, Incorporation, State or Country Code

Entity, File Number

001-33059

Entity, Tax Identification Number

20-5657551

Entity, Address, Address Line One

27601 Bella Vista Parkway

Entity, Address, City or Town

Warrenville

Entity, Address, State or Province

Entity, Address, Postal Zip Code

60555

City Area Code

630

Local Phone Number

845-4500

Title of 12(b) Security

Common Stock

Trading Symbol

FTEK

Security Exchange Name

NASDAQ

Written Communications

false

Soliciting Material

false

Pre-commencement Tender Offer

false

Pre-commencement Issuer Tender Offer

false

Entity, Emerging Growth Company

false

Amendment Flag

false

Entity, Central Index Key

0000846913

- 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

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:

dei_DocumentInformationLineItems

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

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

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