SO is trading 4.01% up now at $88.91, with no verified company-specific catalyst explaining the after-hours jump.
- SO closed at $85.52 on September 18, 2026.
- Morgan Stanley reportedly cut Southern Company to Underweight and lowered its price target to $85, which does not directly explain the upward move.
- Broader markets were mixed: the Nasdaq rose 0.80%, while the S&P 500 rose 0.27%.