secwatch.observer — SEC 8-K summary ====================================== Issuer: GT Biopharma, Inc. (GTBP) CIK: 0000109657 Form: 8-K Filed at: 2025-09-23T23:59:59+00:00 Accession: 0001493152-25-014684 Event type: other Sentiment: positive Materiality: 0.55 Item codes: 3.03, 9.01 LLM model: deepseek-v4-flash:cloud@v2 GT Biopharma series L preferred holders waive redemption rights permanently --------------------------------------------------------------------------- - Holders of Series L 10% Convertible Preferred Stock waived redemption rights under Section 10 of the Certificate of Designations. - Waivers were provided on September 17, 18, and 23, 2025, and are permanent. - Waiver does not affect other rights of the preferred stockholders under the Certificate of Designations. - The company requested the waiver; certain holders countersigned the form of waiver. Source: EDGAR index: https://www.sec.gov/Archives/edgar/data/109657/000149315225014684/0001493152-25-014684-index.htm Primary doc: https://www.sec.gov/Archives/edgar/data/109657/000149315225014684/form8-k.htm HTML page: https://secwatch.observer/filing/0001493152-25-014684 License: Source filings: public domain (SEC EDGAR). Summaries (headline + bullets): CC-BY-4.0; attribute https://secwatch.observer