<SEC-DOCUMENT>0001654954-20-014090-index.html : 20201231 <SEC-HEADER>0001654954-20-014090.hdr.sgml : 20201231 <ACCEPTANCE-DATETIME>20201231170651 ACCESSION NUMBER: 0001654954-20-014090 CONFORMED SUBMISSION TYPE: 8-K PUBLIC DOCUMENT COUNT: 4 CONFORMED PERIOD OF REPORT: 20201228 ITEM INFORMATION: Changes in Registrant's Certifying Accountant ITEM INFORMATION: Financial Statements and Exhibits FILED AS OF DATE: 20201231 DATE AS OF CHANGE: 20201231 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: 8-K SEC ACT: 1934 Act SEC FILE NUMBER: 000-08092 FILM NUMBER: 201429383 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>8-K <SEQUENCE>1 <FILENAME>gtbp_8k.htm <DESCRIPTION>CURRENT REPORT <TEXT> Document 1 - file: gtbp_8k.htm
</DOCUMENT> <DOCUMENT> <TYPE>EX-16.1 <SEQUENCE>2 <FILENAME>gtbp_ex16-1.htm <DESCRIPTION>LETTER FROM SELIGSON & GIANNATTASIO, LLP <TEXT> Document 2 - file: gtbp_ex16-1.htm
</DOCUMENT> <DOCUMENT> <TYPE>GRAPHIC <SEQUENCE>3 <FILENAME>gtbp_ex16-1000.jpg <DESCRIPTION>IMAGE <TEXT> Document 3 - file: gtbp_ex16-1000.jpg
</DOCUMENT> <DOCUMENT> <TYPE>GRAPHIC <SEQUENCE>4 <FILENAME>gtbp_ex16-1001.jpg <DESCRIPTION>IMAGE <TEXT> Document 4 - file: gtbp_ex16-1001.jpg
</DOCUMENT> </SEC-DOCUMENT>