🟢 GT Biopharma is trading 8% up in after-hours trading — catalyst unconfirmed

GT Biopharma is trading 7.74% up at $6.68 in after-hours on October 1, 2026; the reason for the gain remains unconfirmed.

• The regular-session close was $6.20.
• The latest listed press release was September 15 and concerned a potential new indication for GTB-5550.
• Its press-release page shows no October 1 announcement.