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Sionna Therapeutics faces securities fraud probe after trial failure slashes stock 91%.

Market News
24 Sep 2026
PRNewsWire
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Bearish
Sionna Therapeutics faces securities fraud probe after trial failure slashes stock 91%.

Sionna Therapeutics announced its PreciSION CF Phase 2a trial failed to meet key endpoints, causing its stock to plunge 91% on August 10, 2026. The trial tested SION-719 combined with Trikafta for cystic fibrosis but did not reduce sweat chloride as hoped. Following the sharp stock drop, Pomerantz LLP launched an investigation into possible securities fraud or unlawful practices by Sionna and its executives. Investors are advised to contact Pomerantz for potential class action participation.

Sionna Therapeutics shares are the subject of this investigation. For readers following the health sector, here is Pluang's market snapshot as of Sep 25, 2026 04:41 WIB: 38 of 100 health stocks rose, 62 fell. Notable movers include Illumina (ILMN) at USD 275.33 with a 7.81% gain and 69% buy order activity, Moderna (MRNA) at USD 194.70 up 6.91% with 87% sell orders, and Ascendis Pharma (ASND) at USD 221.34 down 6.83% with 100% sell orders.

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