TULSA, OK / ACCESS Newswire / May 28, 2026 / ClearSign Technologies Corporation (NASDAQ:CLIR) (&#34;ClearSign&#34; or the &#34;Company&#34;), a leader in advanced combustion and sensing technologies that help industrial operators

<p><strong id="dateline">TULSA, OK / <a href='https://www.accessnewswire.com/'>ACCESS Newswire</a> / May 28, 2026 / </strong>ClearSign Technologies Corporation (NASDAQ:<a class="ticker" href="https://www.benzinga.com/quote/CLIR">CLIR</a>) ("ClearSign" or the "Company"), a leader in advanced combustion and sensing technologies that help industrial operators dramatically reduce emissions, increase efficiency and support the use of cleaner fuels including hydrogen, today announces that it is proposing to sell shares of its common stock in an underwritten public offering (the "Public Offering"). All of the shares in the Public Offering are to be sold by ClearSign. ClearSign intends to grant the underwriter a 30-day option to purchase up to an additional 15% of the shares of common stock offered in the Public Offering at the Public Offering price, less the underwriting discount.</p><p>ClearSign intends to use the net proceeds from the Public Offering for working capital, research and development, marketing and sales, and general corporate purposes. The final terms of the Public Offering will depend on market and other conditions at the time of pricing, and there can be no assurance as to whether or when the Public Offering may be completed, or as to the actual size or terms of the Public Offering.</p><p>Newbridge Securities Corporation is acting as the sole book-running manager of the Public Offering.</p><p>The shares described above are being offered by ClearSign pursuant to a shelf registration statement on Form S-3 (File No. 333-288736) previously filed with and subsequently declared effective by the Securities and Exchange Commission ("SEC"). A preliminary prospectus supplement relating to the Public Offering has been filed with the SEC and is available on the SEC's website at <a rel="nofollow" href="https://pr.report/lypj">http://www.sec.gov</a>. A final prospectus supplement describing the terms of the Public Offering will be filed with the SEC. The Public Offering will be made only by means of the prospectus supplement and the accompanying base prospectus, as may be further supplemented by any free writing prospectus and/or pricing supplement that the Company may file with the SEC. Copies of the preliminary prospectus supplement, and accompanying base prospectus relating to this Public Offering, may be obtained from Newbridge Securities Corporation, Attn: Equity Syndicate Department, 1200 North Federal Highway, Suite 400, Boca Raton, FL 33432, email: <a rel="nofollow" href="mailto:syndicate@newbridgesecurities.com">syndicate@newbridgesecurities.com</a>, telephone: (877) 447-9625.</p><p>This press release shall not constitute an offer to sell or the solicitation of an offer to buy any of the securities described herein, nor shall there be any sale of these securities in any state or jurisdiction in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such state or jurisdiction.</p><p><strong>About ClearSign Technologies Corporation</strong></p><p>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<sup>&#8482;</sup> and ClearSign Eye<sup>&#8482;</sup> 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 <a rel="nofollow" href="https://pr.report/lypi"><u>www.clearsign.com</u></a>.</p><p><strong>Cautionary Note on Forward-Looking Statements</strong></p><p>All statements in this press release that are not based on historical fact constitute "forward-looking statements." Such forward-looking statements involve known and unknown risks, uncertainties and other factors that could cause the actual results of the Company to be materially different from historical results or from any future results expressed or implied by such forward-looking statements. In addition to statements which explicitly describe such risks and uncertainties, readers are urged to consider statements containing the terms "intends," "estimates," "may," "might," "will" or other similar expressions to be uncertain and forward-looking. The Public Offering is subject to market and other conditions and there can be no assurance as to whether or when the Public Offering may be completed or as to the actual size or terms of the Public Offering. For further information on these and other risks and uncertainties that may affect the Company's business, see the "Risk Factors" section of the Company's filings with the SEC, including ClearSign's Annual Report on Form 10-K filed with the SEC on March 31, 2026, Quarterly Report on Form 10-Q filed with the SEC on May 15, 2026 and the preliminary prospectus supplement filed with the SEC on May 27, 2026. There can be no assurance that forward-looking information will prove to be accurate, as actual results could differ materially from those anticipated in such statements. Accordingly, ClearSign cautions readers not to place undue reliance on any forward-looking statements. The Company disclaims any intention to, and except as may be required by law, undertakes no obligation to, update or revise forward-looking statements to reflect events or circumstances that subsequently occur or of which the Company hereafter becomes aware.</p><p><strong>SOURCE</strong>: ClearSign Technologies</p><br/><br/>View the original <a href='https://www.accessnewswire.com/newsroom/en/electronics-and-engineering/clearsign-technologies-corporation-announces-proposed-public-offering-o-1170946'>press release</a> on ACCESS Newswire<br/><br/>
      <img src="https://app.accessnewswire.com/img.ashx?id=1170946" width="0" height="0"/>

CLIR

ClearSign Technologies Corporation Announces Proposed Public Offering of Common Stock

ClearSign initiates public offering to fund growth, signaling dilution risk

<section class="insight" data-version="1">
  <section data-block="information">
    <h3>Information</h3>
    <p>TULSA, OK / ACCESS Newswire / May 28, 2026 / ClearSign Technologies Corporation (NASDAQ:CLIR) (&amp;#34;ClearSign&amp;#34; or the &amp;#34;Company&amp;#34;), a leader in advanced combustion and sensing technologies that help industrial operators</p>
  </section>

  <section data-block="ai-summary-paragraph">
    <h3>AI Summary</h3>
    <p>ClearSign (CLIR) announced a proposed underwritten public offering with a 30-day option for 15% additional shares. Proceeds will support working capital, R&amp;D, marketing and general corporate purposes, with final terms hinging on market conditions. The move signals growth ambition but introduces near-term dilution risk and potential stock-price pressure until pricing is set.</p>
  </section>

  <section data-block="ai-summary-bullets">
    <h3>Key Points</h3>
    <ul><li>ClearSign to raise capital via public offering; 15% greenshoe option.</li><li>Proceeds earmarked for working capital, R&amp;D, marketing; size depends on market.</li><li>Shelf registration on Form S-3; preliminary prospectus filed May 27, 2026.</li><li>Newbridge Securities is sole book-running manager for the offering.</li><li>No assurance of completion; terms will depend on market conditions.</li></ul>
  </section>

  <section data-block="companies-mentioned">
    <h3>Companies Mentioned</h3>
    <ul><li><strong>ClearSign Technologies Corporation (CLIR)</strong>: Announces proposed public offering; potential dilution; capital raise.</li><li><strong>Newbridge Securities Corporation (N/A)</strong>: Sole book-running manager; coordinating pricing and execution.</li><li><strong>Securities and Exchange Commission (N/A)</strong>: Regulatory filing context; SEC involved in shelf registration.</li></ul>
  </section>

  <section data-block="category">
    <h3>Corporate Developments</h3>
    <p>Category: Corporate Developments. The article details a capital-raising action via a public offering, highlighting financing needs and potential dilution implications for CLIR&#039;s equity base, which is central to near-term valuation and liquidity considerations.</p>
  </section>

  <section data-block="market-moving">
    <h3>Market-Moving</h3>
    <ul><li>Offering size and final terms remain uncertain until pricing.</li><li>Dilutive equity issuance could pressure CLIR share price.</li><li>Newbridge Securities as underwriter implies formal roadshow and pricing.</li><li>Proceeds earmarked for R&amp;D and commercialization; execution risk remains.</li></ul>
  </section>

  <section data-block="key-facts">
    <h3>Key Facts</h3>
    <ul><li>Public offering: all shares sold by ClearSign; size pending market conditions.</li><li>30-day option to purchase up to 15% more stock.</li><li>Shelf registration on Form S-3; File No. 333-288736.</li><li>Preliminary prospectus supplement filed May 27, 2026.</li><li>Newbridge Securities is sole book-running manager.</li></ul>
  </section>

  <section data-block="trading-thesis">
    <h3>Trading Thesis</h3>
    <p>Bearish near-term on dilution; potential upside if funding accelerates growth within 6–12 months.</p>
  </section>
</section>


<p><strong id="dateline">TULSA, OK / <a href='https://www.accessnewswire.com/'>ACCESS Newswire</a> / May 28, 2026 / </strong>ClearSign Technologies Corporation (NASDAQ:<a class="ticker" href="https://www.benzinga.com/quote/CLIR">CLIR</a>) ("ClearSign" or the "Company"), a leader in advanced combustion and sensing technologies that help industrial operators dramatically reduce emissions, increase efficiency and support the use of cleaner fuels including hydrogen, today announces that it is proposing to sell shares of its common stock in an underwritten public offering (the "Public Offering"). All of the shares in the Public Offering are to be sold by ClearSign. ClearSign intends to grant the underwriter a 30-day option to purchase up to an additional 15% of the shares of common stock offered in the Public Offering at the Public Offering price, less the underwriting discount.</p><p>ClearSign intends to use the net proceeds from the Public Offering for working capital, research and development, marketing and sales, and general corporate purposes. The final terms of the Public Offering will depend on market and other conditions at the time of pricing, and there can be no assurance as to whether or when the Public Offering may be completed, or as to the actual size or terms of the Public Offering.</p><p>Newbridge Securities Corporation is acting as the sole book-running manager of the Public Offering.</p><p>The shares described above are being offered by ClearSign pursuant to a shelf registration statement on Form S-3 (File No. 333-288736) previously filed with and subsequently declared effective by the Securities and Exchange Commission ("SEC"). A preliminary prospectus supplement relating to the Public Offering has been filed with the SEC and is available on the SEC's website at <a rel="nofollow" href="https://pr.report/lypj">http://www.sec.gov</a>. A final prospectus supplement describing the terms of the Public Offering will be filed with the SEC. The Public Offering will be made only by means of the prospectus supplement and the accompanying base prospectus, as may be further supplemented by any free writing prospectus and/or pricing supplement that the Company may file with the SEC. Copies of the preliminary prospectus supplement, and accompanying base prospectus relating to this Public Offering, may be obtained from Newbridge Securities Corporation, Attn: Equity Syndicate Department, 1200 North Federal Highway, Suite 400, Boca Raton, FL 33432, email: <a rel="nofollow" href="mailto:syndicate@newbridgesecurities.com">syndicate@newbridgesecurities.com</a>, telephone: (877) 447-9625.</p><p>This press release shall not constitute an offer to sell or the solicitation of an offer to buy any of the securities described herein, nor shall there be any sale of these securities in any state or jurisdiction in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such state or jurisdiction.</p><p><strong>About ClearSign Technologies Corporation</strong></p><p>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<sup>&#8482;</sup> and ClearSign Eye<sup>&#8482;</sup> 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 <a rel="nofollow" href="https://pr.report/lypi"><u>www.clearsign.com</u></a>.</p><p><strong>Cautionary Note on Forward-Looking Statements</strong></p><p>All statements in this press release that are not based on historical fact constitute "forward-looking statements." Such forward-looking statements involve known and unknown risks, uncertainties and other factors that could cause the actual results of the Company to be materially different from historical results or from any future results expressed or implied by such forward-looking statements. In addition to statements which explicitly describe such risks and uncertainties, readers are urged to consider statements containing the terms "intends," "estimates," "may," "might," "will" or other similar expressions to be uncertain and forward-looking. The Public Offering is subject to market and other conditions and there can be no assurance as to whether or when the Public Offering may be completed or as to the actual size or terms of the Public Offering. For further information on these and other risks and uncertainties that may affect the Company's business, see the "Risk Factors" section of the Company's filings with the SEC, including ClearSign's Annual Report on Form 10-K filed with the SEC on March 31, 2026, Quarterly Report on Form 10-Q filed with the SEC on May 15, 2026 and the preliminary prospectus supplement filed with the SEC on May 27, 2026. There can be no assurance that forward-looking information will prove to be accurate, as actual results could differ materially from those anticipated in such statements. Accordingly, ClearSign cautions readers not to place undue reliance on any forward-looking statements. The Company disclaims any intention to, and except as may be required by law, undertakes no obligation to, update or revise forward-looking statements to reflect events or circumstances that subsequently occur or of which the Company hereafter becomes aware.</p><p><strong>SOURCE</strong>: ClearSign Technologies</p><br/><br/>View the original <a href='https://www.accessnewswire.com/newsroom/en/electronics-and-engineering/clearsign-technologies-corporation-announces-proposed-public-offering-o-1170946'>press release</a> on ACCESS Newswire<br/><br/>
      <img src="https://app.accessnewswire.com/img.ashx?id=1170946" width="0" height="0"/>

ClearSign (CLIR) announced a proposed underwritten public offering with a 30-day option for 15% additional shares. Proceeds will support working capital, R&D, marketing and general corporate purposes, with final terms hinging on market conditions. The move signals growth ambition but introduces near-term dilution risk and potential stock-price pressure until pricing is set.

ClearSign Technologies Corporation Announces Proposed Public Offering of Common Stock

AI Summary

Sentiment Rationale

Trading Thesis

Market-Moving

Key Facts

Companies Mentioned

Corporate Developments

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