🟢 Sionna Therapeutics is trading 5.37% up in pre-market amid broader risk-on sentiment

Sionna Therapeutics is trading at $6.28, up +5.37% in pre-market on September 21, 2026, apparently alongside broader risk-on sentiment rather than a newly identified company-specific catalyst.

• Major U.S. indices are up more than 0.5%.
• The September 14 restructuring discontinued SION-719’s add-on strategy and prioritized a dual-combination program expected to enter Phase 2a in early 2027.
• Recent restructuring pressure and a September 21 Stifel Hold reiteration remain background, not clear fresh drivers.