0000728385 2026-02-12 2026-02-12 0000728385 1 2026-02-12 2026-02-12 iso4217:USD S-1 S-1/A EX-FILING FEES 333-292701 0000728385 Birchtech Corp. N/A N/A S-1 Birchtech Corp. true Equity Common Stock, par value $0.001 per share true 17250000.00 2382.22 17250000.00 2382.22 3176.30 0.00 0.00 (a) Pursuant to Rule 416 under the Securities Act, there are also being registered such indeterminate number of additional securities as may be issued to prevent dilution resulting from share splits, share dividends, or similar transactions. (b) Estimated solely for the purpose of calculating the registration fee pursuant to Rule 457(o) promulgated under the Securities Act. (c) Includes additional shares of common stock that may be issued upon exercise of a 30-day option granted to the underwriters to cover over-allotments, if any. (d) The Registrant previously paid registration fees of $3,176.30 in connection with the initial filing of this Registration Statement on Form S-1 on January 13, 2026.