Certain Common Stock of GT Biopharma, Inc. are subject to a Lock-Up Agreement Ending on 5-APR-2023. These Common Stock will be under lockup for 91 days starting from 4-JAN-2023 to 5-APR-2023.

Details:
The directors and executive officers have also entered into lock-up agreements have agreed, subject to specified exceptions, not to sell or transfer any shares of common stock or securities convertible, exchangeable or exercisable into, shares of common stock during a period ending 90 days after the date of this prospectus supplement.