🟢 GT Biopharma is trading 5.9% up in after-hours trading with no clear company-specific catalyst

GT Biopharma is trading at $6.46, up 5.90% from the October 2 regular-session close of $6.10, with no clear company-specific catalyst identified.

• The company’s press-release page lists September 15 as its latest announcement, with no October 2 release shown.
• Broader markets were positive: the S&P 500 rose 0.70% and the Nasdaq Composite gained 1.14%. They may have supported the move, but no direct link is confirmed.