0001659617 2026-07-29 2026-07-29 0001659617 1 2026-07-29 2026-07-29 0001659617 2 2026-07-29 2026-07-29 0001659617 3 2026-07-29 2026-07-29 0001659617 4 2026-07-29 2026-07-29 0001659617 5 2026-07-29 2026-07-29 iso4217:USD pure S-1 S-1 EX-FILING FEES 0001659617 Moleculin Biotech, Inc. N/A N/A S-1 Moleculin Biotech, Inc. false Equity Common Stock, $0.001 par value per share(2) true 10000000.00 0.0001381 1381.00 false Equity Series I Warrants to purchase common stock(3) true 0.0001381 0.00 false Equity Pre-Funded Warrants to purchase common stock(3) true 0.0001381 0.00 false Equity Common Stock issuable upon exercise of Series I Warrants(2) true 30000000.00 0.0001381 4143.00 false Equity Common Stock issuable upon exercise of Pre-Funded Warrants(2) true 0.0001381 0.00 40000000.00 5524.00 0.00 0.00 5524.00 (2) Pursuant to Rule 416 under the Securities Act, the securities being registered hereunder include such indeterminate number of additional shares of common stock as may be issued after the date hereof as a result of stock splits, stock dividends or similar transactions. (4) The proposed maximum aggregate offering price of the common stock proposed to be sold in the offering will be reduced on a dollar-for-dollar basis based on the offering price of any Pre-Funded Warrants sold in the offering, and, as such, the proposed maximum aggregate offering price of the common stock and Pre-Funded Warrants (including the common stock issuable upon exercise of the Pre-Funded Warrants), if any, is $10,000,000. (3) Pursuant to Rule 457(g) of the Securities Act, no separate registration fee is required for the warrants because the warrants are being registered in the same registration statement as the common stock issuable upon exercise of the warrants. (3) Pursuant to Rule 457(g) of the Securities Act, no separate registration fee is required for the warrants because the warrants are being registered in the same registration statement as the common stock issuable upon exercise of the warrants. (2) Pursuant to Rule 416 under the Securities Act, the securities being registered hereunder include such indeterminate number of additional shares of common stock as may be issued after the date hereof as a result of stock splits, stock dividends or similar transactions. (2) Pursuant to Rule 416 under the Securities Act, the securities being registered hereunder include such indeterminate number of additional shares of common stock as may be issued after the date hereof as a result of stock splits, stock dividends or similar transactions.