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Sionna Therapeutics faces investigation after trial failure causes 91% stock plunge

Market News
27 Aug 2026
PRNewsWire
View Source
Bearish
pluang ai news

Sionna Therapeutics announced that its PreciSION CF Phase 2a trial failed to meet the key endpoint, leading to a 91.18% drop in its stock price. The trial tested SION-719 combined with Trikafta for cystic fibrosis but did not reduce sweat chloride levels as hoped. Following this, Pomerantz LLP launched an investigation into possible securities fraud or unlawful practices by Sionna and its executives. Investors are advised to contact Pomerantz LLP for potential class action participation.

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