U. S. SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 10-Q ☑ Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended September 30, 2019. ☐ For the transition period from to . Commission File Number 0-8092 GT BIOPHARMA, INC. (Exact name of small business issuer as specified in its charter) Delaware 94-1620407 (State or other jurisdiction of incorporation or organization) (I.R.S. employer identification number) 9350 Wilshire Blvd. Sui ...

U. S. SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 10-Q ☑ Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended June 30, 2019. ☐ For the transition period from to . Commission File Number 0-8092 GT BIOPHARMA, INC. (Exact name of small business issuer as specified in its charter) Delaware (State or other jurisdiction of incorporation or organization) 94-1620407 (I.R.S. employer identification number) 9350 Wilshire Blvd. Suite 20 ...

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2018 Commission File Number: 000-08092 GT BIOPHARMA, INC. (Exact name of Registrant as specified in its charter) (State of incorporation or organization) (I.R.S. Employer Identification No.) Delaware 94-1620407 310 N. Westlake Blvd. Suite 206 Westlake Village, CA 91362 (Address of principal executive offi ...