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Sionna Therapeutics stock plunges 91% after failed Phase 2a trial on cystic fibrosis drug

Market News
27 Aug 2026
PRNewsWire
View Source
Bearish
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Sionna Therapeutics announced that its SION-719 Phase 2a trial did not meet the key endpoint of reducing sweat chloride, a measure important in cystic fibrosis treatment. Following this announcement, the company's stock price dropped over 91%. Robbins Geller Rudman & Dowd LLP has launched an investigation into potential securities law violations related to this event. Investors who suffered losses may seek legal assistance as the case develops.

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