SEATTLE, WA--(Marketwire - May 15, 2012) - ClearSign Combustion Corporation (NASDAQ: [ CLIR ]) today announced that the underwriter, MDB Capital Group LLC, exercised in full its over-allotment option to purchase an additional 450,000 shares of the Company's common stock at a price of $4.00 per share, for gross proceeds of $1.8 million. The exercise of the over-allotment option brings the total initial public offering size to gross proceeds of $13.8 million.

The exercise of the over-allotment option brings the total shares issued and outstanding of the Company's common stock to 8,731,216.

In accordance with Rule 13a-12(a) of the Securities Exchange Act of 1934, the Company intends to file its Quarterly Report on Form 10-Q for the quarter ended March 31, 2012 on or before June 11, 2012.

This press release does not constitute an offer to sell or a solicitation of an offer to buy these securities, nor shall there be any sale of these securities in any jurisdiction in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such jurisdiction. Copies of the final prospectus relating to this offering may be obtained from MDB Capital Group LLC, 401 Wilshire Boulevard, Suite 1020, Santa Monica CA 90401, (310) 526-5000.

About ClearSign Combustion Corporation
ClearSign Combustion Corporation designs and develops technologies that aim to improve key performance characteristics of combustion systems including energy efficiency, emissions control, fuel flexibility and overall cost effectiveness. Our Electrodynamic Combustion Control™ (ECC™) platform technology improves control of flame shape and heat transfer and optimizes the complex chemical reactions that occur during combustion in order to minimize harmful emissions. For more information about the Company, please visit [ www.clearsigncombustion.com ]

About MDB Capital Group
MDB Capital Group LLC is an investment banking and institutional research firm focused exclusively on companies possessing or seeking to develop market changing, disruptive technologies and intellectual property. For more information on MDB Capital Group, please visit [ www.mdb.com ]

Cautionary note on forward-looking statements
This press release includes forward-looking information and statements within the meaning of the Private Securities Litigation Reform Act of 1995 and the provisions of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended. Except for historical information contained in this release, statements in this release may constitute forward-looking statements regarding our assumptions, projections, expectations, targets, intentions or beliefs about future events that are based on management's belief, as well as assumptions made by, and information currently available to, management. While we believe that our expectations are based upon reasonable assumptions, there can be no assurances that our goals and strategy will be realized. Numerous factors, including risks and uncertainties, may affect our actual results and may cause results to differ materially from those expressed in forward-looking statements made by us or on our behalf. Some of these factors include the acceptance of existing and future products, the impact of competitive products and pricing, general business and economic conditions, and other factors to be detailed in our periodic reports filed with the SEC. We specifically disclaim any obligation to update or revise any forward-looking statement whether as a result of new information, future developments or otherwise.