Exempt Offering Notice · D

ClearSign Technologies Corporation

CLIRNASDAQEQUITYCurrent

Exempt Offering Notice

Filed Jul 31, 2026Accepted Jul 31, 2026, 4:30 PM EDTFiling CIK 1434524Accession 0001104659-26-089253

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Structured filing — D

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Issuer

Name: ClearSign Technologies Corp
CIK: 0001434524
Entity type: Corporation
Jurisdiction: DELAWARE
Phone: (918) 236-6461
Street: 8023 E. 63RD PLACE
Street (continued): SUITE 101
City: TULSA
State / country code: OK
State / country: OKLAHOMA
Postal code: 74133
Incorporated more than five years ago: true
Previous EDGAR names: CLEARSIGN COMBUSTION CORP

Related person 1

First name: Colin
Middle name: James
Last name: Deller
Relationships: Executive Officer · Director
Relationship clarification: Chief Executive Officer
Street: 8023 E. 63rd Place
Street (continued): Suite 101
City: Tulsa
State / country code: OK
State / country: OKLAHOMA
Postal code: 74133

Related person 2

First name: Brent
Last name: Hinds
Relationships: Executive Officer
Relationship clarification: Chief Financial Officer
Street: 8023 E. 63rd Place
Street (continued): Suite 101
City: Tulsa
State / country code: OK
State / country: OKLAHOMA
Postal code: 74133

Related person 3

First name: Anthony
Last name: DiGiandomenico
Relationships: Director
Street: 8023 E. 63rd Place
Street (continued): Suite 101
City: Tulsa
State / country code: OK
State / country: OKLAHOMA
Postal code: 74133

Related person 4

First name: Louis
Middle name: J
Last name: Basenese
Relationships: Director
Street: 8023 E. 63rd Place
Street (continued): Suite 101
City: Tulsa
State / country code: OK
State / country: OKLAHOMA
Postal code: 74133

Related person 5

First name: Todd
Middle name: Gil
Last name: Silva
Relationships: Director
Street: 8023 E. 63rd Place
Street (continued): Suite 101
City: Tulsa
State / country code: OK
State / country: OKLAHOMA
Postal code: 74133

Offering

Industry: Other Technology
Revenue range: Decline to Disclose
Exemption codes: 06b
Amendment: false
First sale date: 2026-07-22
Offering lasts more than one year: false
Equity securities: true
Business combination: false
Minimum investment accepted: 0
Total offering amount: 1,770,000
Amount sold: 1,770,000
Remaining amount: 0
Non-accredited investors reported: false
Investors already participating: 1

Commissions, fees and proceeds

Sales commissions: 0
Finders’ fees: 0
Commission / fee clarification: [blank]
Gross proceeds used: 0
Use of proceeds clarification: [blank]

Signature authorization

Authorized representative: false

Signature 1

Issuer: ClearSign Technologies Corp
Signer: Colin James Deller
Signed: /s/ Colin James Deller
Title: Chief Executive Officer
Date: 2026-07-31

Company context

ClearSign Technologies Corporation designs and develops products and technologies for the purpose of decarbonization and improving key performance characteristics of industrial and commercial systems, including operational performance, energy efficiency, emission reduction, safety, the use of hydrogen as a fuel and overall cost-effectiveness. Our patented technologies, embedded in established OEM products as ClearSign Core ™ and ClearSign Eye ™ and other sensing configurations, enhance the performance of combustion systems and fuel safety systems in a broad range of markets, including the energy (upstream oil production and down-stream refining), commercial/industrial boiler, chemical, petrochemical, transport and power industries. For more information, please visit www.clearsign.com.

Current securities

CLIRNASDAQ · EQUITY · Current

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