<SEC-DOCUMENT>0001654954-18-010637-index.html : 20180928 <SEC-HEADER>0001654954-18-010637.hdr.sgml : 20180928 <ACCEPTANCE-DATETIME>20180928160028 ACCESSION NUMBER: 0001654954-18-010637 CONFORMED SUBMISSION TYPE: 8-K PUBLIC DOCUMENT COUNT: 3 CONFORMED PERIOD OF REPORT: 20180924 ITEM INFORMATION: Entry into a Material Definitive Agreement ITEM INFORMATION: Unregistered Sales of Equity Securities ITEM INFORMATION: Financial Statements and Exhibits FILED AS OF DATE: 20180928 DATE AS OF CHANGE: 20180928 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: FL FISCAL YEAR END: 1231 FILING VALUES: FORM TYPE: 8-K SEC ACT: 1934 Act SEC FILE NUMBER: 000-08092 FILM NUMBER: 181094140 BUSINESS ADDRESS: STREET 1: 1825 K STREET STREET 2: SUITE 510 CITY: WASHINGTON, D.C. STATE: DC ZIP: 33602 BUSINESS PHONE: (800) 304-9888 MAIL ADDRESS: STREET 1: 1825 K STREET STREET 2: SUITE 510 CITY: WASHINGTON, D.C. STATE: DC ZIP: 33602 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>8-K <SEQUENCE>1 <FILENAME>gtbp_8k.htm <DESCRIPTION>FORM 8-K <TEXT> Document 1 - file: gtbp_8k.htm
</DOCUMENT> <DOCUMENT> <TYPE>EX-4.1 <SEQUENCE>2 <FILENAME>gtbp_ex41.htm <DESCRIPTION>FORM OF 10% SENIOR CONVERTIBLE DEBENTURE <TEXT> Document 2 - file: gtbp_ex41.htm
</DOCUMENT> <DOCUMENT> <TYPE>EX-10.1 <SEQUENCE>3 <FILENAME>gtbp_ex101.htm <DESCRIPTION>SECURITIES PURCHASE AGREEMENT <TEXT> Document 3 - file: gtbp_ex101.htm
</DOCUMENT> </SEC-DOCUMENT>