ClearSign posts new investor presentation online

Q: What did ClearSign Technologies Corp (CLIR) announce on September 14, 2026?

ClearSign Technologies Corp announced that it posted an investor presentation on its website on September 14, 2026 for use in upcoming meetings and conferences with investors, analysts and other interested parties.

Q: Where can investors find the new CLIR investor presentation?

The investor presentation can be accessed at the “Events & Presentations” tab of the “Investors” section of ClearSign Technologies Corp’s website at https://ir.clearsign.com/events-and-presentations.

Q: Under which item was ClearSign Technologies Corp’s investor presentation furnished?

The investor presentation was furnished under Item 7.01 of Form 8-K, which is used for Regulation FD disclosure to provide information to investors and the market.

Q: Will the CLIR investor presentation be incorporated into other SEC filings?

ClearSign Technologies Corp states the information will not be incorporated by reference into Securities Act or Exchange Act documents, except where it is expressly included by specific reference.

ClearSign Technologies Corp (CLIR) announced that on September 14, 2026 it posted an investor presentation on its website for use in upcoming meetings and conferences with investors, analysts and other interested parties.

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Filing Sentiment

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Form Type

8-K

Rhea-AI Filing Summary

ClearSign Technologies Corp (CLIR) announced that on September 14, 2026 it posted an investor presentation on its website for use in upcoming meetings and conferences with investors, analysts and other interested parties. The presentation is available under the “Events & Presentations” tab in the Investors section of its website.

The information is being furnished under Item 7.01 of Form 8-K, is not deemed “filed” for purposes of Section 18 of the Exchange Act, and will only be incorporated into other securities law documents if specifically referenced there.

8-K Event Classification

2 items: 7.01, 9.01

2 items

Item 7.01 Regulation FD Disclosure Disclosure

Material non-public information disclosed under Regulation Fair Disclosure, often investor presentations or guidance.

Item 9.01 Financial Statements and Exhibits Exhibits

Financial statements, pro forma financial information, or exhibit attachments filed with this report.

Key Figures

Disclosure date: September 14, 2026 Form type: Form 8-K, Item 7.01 Trading symbol: CLIR

3 metrics

Disclosure date September 14, 2026 Date the investor presentation was posted and the Form 8-K was signed

Form type Form 8-K, Item 7.01 Used to furnish the investor presentation information

Trading symbol CLIR Common Stock listed on The Nasdaq Stock Market LLC

Key Terms

investor presentation, Section 18 of the Securities Exchange Act of 1934, incorporated by reference, Cover Page Interactive Data File, +1 more

5 terms

investor presentation financial

"posted an investor presentation on its website intended for use"

An investor presentation is a carefully prepared talk or visual display that explains a company's business, goals, and financial performance. It helps investors understand how the company operates and its future prospects, much like a report card or progress update. These presentations are important because they provide transparency and help investors decide whether to support or invest in the company.

Section 18 of the Securities Exchange Act of 1934 regulatory

"shall not be deemed to be “filed” for the purposes of Section 18"

incorporated by reference regulatory

"shall not be incorporated by reference into any filings made by"

Cover Page Interactive Data File technical

"104 | | Cover Page Interactive Data File (embedded within"

Inline XBRL technical

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

Inline XBRL is a file format for financial filings that embeds machine-readable data tags directly inside the human-readable report, so the same document can be read by people and parsed by software. For investors it makes extracting, comparing and verifying financial numbers faster and more reliable—like a grocery list where each item also has a barcode—reducing manual errors and speeding up analysis.

FAQ

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

What did ClearSign Technologies Corp (CLIR) announce on September 14, 2026?

ClearSign Technologies Corp announced that it posted an investor presentation on its website on September 14, 2026 for use in upcoming meetings and conferences with investors, analysts and other interested parties.

Where can investors find the new CLIR investor presentation?

The investor presentation can be accessed at the “Events & Presentations” tab of the “Investors” section of ClearSign Technologies Corp’s website at https://ir.clearsign.com/events-and-presentations.

Under which item was ClearSign Technologies Corp’s investor presentation furnished?

The investor presentation was furnished under Item 7.01 of Form 8-K, which is used for Regulation FD disclosure to provide information to investors and the market.

Is the CLIR investor presentation considered filed for Exchange Act liability purposes?

No. The company states that the information furnished under Item 7.01 is not deemed “filed” for purposes of Section 18 of the Exchange Act and is not subject to that section’s liabilities.

Will the CLIR investor presentation be incorporated into other SEC filings?

ClearSign Technologies Corp states the information will not be incorporated by reference into Securities Act or Exchange Act documents, except where it is expressly included by specific reference.

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

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Available on EDGAR 09/14/2026 - 08:46 AM EDT Accepted by SEC EDGAR 09/14/2026 - 08:45 AM EDT

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

CLEARSIGN TECHNOLOGIES CORPORATION

(Exact name of registrant as specified in charter)

Delaware		001-35521		26-2056298
(State or other jurisdiction of incorporation)		(Commission File Number)		(IRS Employer Identification No.)

8023 E. 63rd Place, Suite 101

Tulsa, Oklahoma 74133

(Address of principal executive offices and zip code)

(918) 500-7312

(Registrant's telephone number, including area code)

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 (see General Instruction A.2 below).

¨	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 CFR240.14a-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))

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		CLIR		The Nasdaq Stock Market LLC

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

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, ClearSign Technologies Corporation (the “Company”) posted an investor presentation on its website intended for use in upcoming meetings and conferences with investors, analysts and other interested parties. The presentation can be accessed at the “Events & Presentations” tab of the “Investors” section of the Company’s website at https://ir.clearsign.com/events-and-presentations.

The information furnished under this Item 7.01 of this Current Report on Form 8-K shall not be deemed to be “filed” for the purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, and shall not be incorporated by reference into any filings made by the Company pursuant to the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific reference in such filing.

Item 9.01

Financial Statements and Exhibits.

(d) Exhibits.

Exhibit No.		Description
104		Cover Page Interactive Data File (embedded within the Inline XBRL document).

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, the registrant has duly caused this Current Report to be signed on its behalf by the undersigned hereunto duly authorized.

Dated: September 14, 2026

	CLEARSIGN TECHNOLOGIES CORPORATION

	By:	/s/ Colin James Deller
	Name:	Colin James Deller
	Title:	Chief Executive Officer

Source: View Original Filing on SEC EDGAR

Filing Exhibits & Attachments

3 documents