<SEC-DOCUMENT>0001654954-21-001543-index.html : 20210212 <SEC-HEADER>0001654954-21-001543.hdr.sgml : 20210212 <ACCEPTANCE-DATETIME>20210211200808 ACCESSION NUMBER: 0001654954-21-001543 CONFORMED SUBMISSION TYPE: 424B4 PUBLIC DOCUMENT COUNT: 8 FILED AS OF DATE: 20210212 DATE AS OF CHANGE: 20210211 FILER: COMPANY DATA: COMPANY CONFORMED NAME: GT Biopharma, Inc. CENTRAL INDEX KEY: 0000109657 STANDARD INDUSTRIAL CLASSIFICATION: PHARMACEUTICAL PREPARATIONS [2834] IRS NUMBER: 941620407 STATE OF INCORPORATION: DE FISCAL YEAR END: 1231 FILING VALUES: FORM TYPE: 424B4 SEC ACT: 1933 Act SEC FILE NUMBER: 333-251311 FILM NUMBER: 21621945 BUSINESS ADDRESS: STREET 1: 9350 WILSHIRE BLVD. STREET 2: SUITE 203 CITY: BEVERLY HILLS STATE: CA ZIP: 90212 BUSINESS PHONE: (800) 304-9888 MAIL ADDRESS: STREET 1: 9350 WILSHIRE BLVD. STREET 2: SUITE 203 CITY: BEVERLY HILLS STATE: CA ZIP: 90212 FORMER COMPANY: FORMER CONFORMED NAME: OXIS INTERNATIONAL INC DATE OF NAME CHANGE: 19940916 FORMER COMPANY: FORMER CONFORMED NAME: DDI PHARMACEUTICALS INC DATE OF NAME CHANGE: 19920703 FORMER COMPANY: FORMER CONFORMED NAME: DIAGNOSTIC DATA INC /DE/ DATE OF NAME CHANGE: 19850312 </SEC-HEADER> <DOCUMENT> <TYPE>424B4 <SEQUENCE>1 <FILENAME>gtbp_424b4.htm <DESCRIPTION>424B4 <TEXT> Document 1 - file: gtbp_424b4.htm
</DOCUMENT> <DOCUMENT> <TYPE>GRAPHIC <SEQUENCE>2 <FILENAME>gtbp_s1000.jpg <DESCRIPTION>IMAGE <TEXT> Document 2 - file: gtbp_s1000.jpg
</DOCUMENT> <DOCUMENT> <TYPE>GRAPHIC <SEQUENCE>3 <FILENAME>gtbp_s10001.jpg <DESCRIPTION>IMAGE <TEXT> Document 3 - file: gtbp_s10001.jpg
</DOCUMENT> <DOCUMENT> <TYPE>GRAPHIC <SEQUENCE>4 <FILENAME>gtbp_s10002.jpg <DESCRIPTION>IMAGE <TEXT> Document 4 - file: gtbp_s10002.jpg
</DOCUMENT> <DOCUMENT> <TYPE>GRAPHIC <SEQUENCE>5 <FILENAME>gtbp_s10003.jpg <DESCRIPTION>IMAGE <TEXT> Document 5 - file: gtbp_s10003.jpg
</DOCUMENT> <DOCUMENT> <TYPE>GRAPHIC <SEQUENCE>6 <FILENAME>gtbp_s1001.jpg <DESCRIPTION>IMAGE <TEXT> Document 6 - file: gtbp_s1001.jpg
</DOCUMENT> <DOCUMENT> <TYPE>GRAPHIC <SEQUENCE>7 <FILENAME>gtbp_s1002.jpg <DESCRIPTION>IMAGE <TEXT> Document 7 - file: gtbp_s1002.jpg
</DOCUMENT> <DOCUMENT> <TYPE>GRAPHIC <SEQUENCE>8 <FILENAME>gtbp_s1013.jpg <DESCRIPTION>IMAGE <TEXT> Document 8 - file: gtbp_s1013.jpg
</DOCUMENT> </SEC-DOCUMENT>