The case for GTBP's September 2 filing is a clean capital structure: eleven preferred series eliminated from the Delaware charter, one class of common stock remaining, and an authorized share count reset. What complicates it is the denominator the board chose. A 1-for-25 reverse split takes GT Biopharma, Inc. (Nasdaq: GTBP) from approximately 45,109,497 shares outstanding to approximately 1,804,379 shares, and the board picked that ratio at the aggressive end of the range stockholders had approved.
Preferred stock stripped from the charter
On September 2, 2026, GT Biopharma filed Certificates of Elimination with the Secretary of State of the State of Delaware, removing all matters set forth in the Certificates of Designations for eleven preferred series: A, B, C, D, E, F, G, H, I, J-1, and K. The filing notes that all outstanding Series C Preferred shares converted in accordance with their terms on that same date. No shares of any of the eleven eliminated series were outstanding immediately before the certificates were filed, so the elimination formalizes what had already resolved at the instrument level.
The simultaneous Certificate of Amendment reduces authorized common stock to 25,000,000 shares and authorized preferred stock to 1,500,000 shares.
The read-through on float compression
The reverse split becomes effective at 12:01 a.m. Eastern Time on September 8, 2026. Every twenty-five pre-split shares of common stock, par value $0.001, automatically combine into one. Nasdaq-adjusted trading in GTBP begins at market open that morning. The new CUSIP is 36254L 407. Outstanding convertible securities, warrants, and stock options all adjust proportionately, with conversion and exercise prices scaled accordingly. The company will not issue fractional shares; the exchange agent instead collects the aggregate fractional interests, sells them at prevailing market prices, and distributes net proceeds pro rata to affected holders.
The counterargument to reading this as a straightforward cleanup is the ratio selection itself. GTBP's stockholders, at the annual meeting on August 14, 2026, authorized a reverse split anywhere in the 1-for-10 to 1-for-30 range. The board, on August 27, approved the final ratio at 1-for-25. Choosing 25 rather than something closer to 10 maximizes headroom between the post-split share count and the new 25,000,000 authorized ceiling, but it concentrates economic exposure for any holder who stays. Thin post-split floats amplify moves in both directions, and 1.8 million shares is a genuinely narrow base.
On balance, what the September 2 8-K resolves is structural: a charter now carrying one class of stock instead of twelve, a compressed but legally clean capitalization table, and a definitive effective date of September 8. The line to watch is volume behavior in GTBP on and after that date, given a post-split float of approximately 1,804,379 shares.