ClearSign Technologies Corporation (NASDAQ: CLIR) announced the pricing of an underwritten public offering of 777,780 shares of common stock at $4.33 per share, generating gross proceeds of approximately $3.4 million.

The combustion and sensing technology company granted the underwriter a 30-day option to purchase up to an additional 15% of the offered shares to cover over-allotments. If exercised in full, the option would increase gross proceeds to approximately $3.9 million.

The offering is expected to close on or about June 1, 2026, subject to customary closing conditions. ClearSign stated it intends to use net proceeds for working capital, research and development, marketing and sales, and general corporate purposes.

Newbridge Securities Corporation serves as the sole book-running manager for the offering. The shares are being offered under a shelf registration statement on Form S-3 previously filed with and declared effective by the Securities and Exchange Commission.

ClearSign develops technologies for industrial and commercial systems focused on decarbonization, operational performance, energy efficiency and emission reduction. The company's products serve markets including energy, commercial and industrial boiler, chemical, petrochemical, transport and power industries.