X0202 SCHEDULE 13G 0002043164 XXXXXXXX LIVE COMMON STOCK, $0.001 PAR VALUE PER SHARE 09/15/2026 0000109657 GT Biopharma, Inc. 36254L407 505 Montgomery Street, 10th Floor San Francisco CA 94111 Rule 13d-1(c) RainForest Partners, LLC NY 180258.00 0.00 180258.00 0.00 180258.00 Y 9.99 CO Note to 5, 7, 9 and 11: Based on 1,804,380 shares outstanding as of September 8, 2026 reported by the OTC Markets. Note to 10: The aggregate amount in Row 9 represents the maximum amount of shares that RainForest Partners LLC can beneficially control under a contractually stipulated 9.99% ownership restriction. The full conversion and/or exercise of RainForest Partners LLC's securities would exceed this restriction. GT Biopharma, Inc. 505 Montgomery Street, 10th Floor, San Francisco, CA 94111 RainForest Partners LLC 850 East 26th Street, Brooklyn, NY 11210 New York Y 180,258.00 9.99% 180,258.00 0.00 180,258.00 0.00 Y Y Y Y Y N By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under § 240.14a-11. RainForest Partners, LLC /s/ Mark Weinberger 09/15/2026