🟢 Sanofi is trading 4.3% up in after-hours trading; catalyst remains unclear

Sanofi is trading 4.28% up at $44.30 in after-hours trading, with no verified company-specific announcement identified for September 18, 2026.

• Sanofi’s official release calendar lists no releases dated September 17 or September 18 and reports no announcement linking the move to a company event.
• Broader markets were mixed, limiting confidence in a macro explanation.
• Recheck for delayed news before September 19, 2026.