Birchtech Corp. entered into an underwriting agreement for a public offering of 6,250,000 shares of its common stock. The shares were priced at $2.40 per share, resulting in aggregate gross proceeds of approximately $15.0 million. Net proceeds from the offering are approximately $13.1 million, after deducting underwriting discounts and commissions and other estimated offering expenses. The company granted underwriters a 30-day option to purchase up to an additional 937,500 shares, which would increase net proceeds to approximately $15.2 million if fully exercised. Net proceeds, along with existing cash, will be used for continuing operating expenses, working capital, and other general corporate purposes. The company's common stock was approved for listing on the NYSE American LLC and began trading on February 26, 2026, under the symbol BCHT. Trading of the common stock on the OTCQB market tier will terminate upon commencement of trading on the NYSE American, while it remains listed on the Toronto Stock Exchange (TSX). Directors and executive officers entered into 90-day lock-up agreements, restricting the sale or disposal of common stock or convertible securities from February 25, 2026. The company's Chief Executive Officer purchased 312,500 shares, totaling $750,000, in the offering for investment purposes.