🔴 Sionna Therapeutics is trading 6.2% down today as biotech sector reverses Wednesday’s rally

Sionna Therapeutics is trading 6.2% down now at $5.86 after the broader biotech sector reversed Wednesday’s rally.

• Biotech ETF XBI is down 2.47% during the regular session, while major indexes are also modestly lower.
• No new company-specific announcement was identified for August 20, 2026.
• The earlier SION-719 Phase 2 setback remains important background but does not explain today’s sector-wide direction.