GTBP GT BIOPHARMA INC Company Mergers 8-K Filing 2024 - Amendment to Settlement and Investment Agreement GT Biopharma, Inc. entered into an Amendment to Settlement and Investment Agreement with Cytovance Biologics, increasing the limit on Cytovance's ownership of shares from 4.9% to 9.9% of GT Biopharma's outstanding shares.Get access to all SEC 8-K filings of the GT BIOPHARMA INC