Gossamer Bio Investors File Securities Lawsuit Over Alleged Misstatements About Phase 3 Drug Trial

A federal securities lawsuit has been filed against Gossamer Bio, Inc. and its CEO, alleging misleading statements about its Phase 3 PROSERA study for the drug seralutinib. The lawsuit claims that Gossamer concealed known risks related to patient enrollment and an unusual placebo response at Latin American clinical sites, which ultimately led to the drug trial failing to meet its primary endpoint and caused the company’s stock to plummet over 80%. Investors who purchased Gossamer securities during the class period of June 16, 2025, through February 20, 2026, and incurred losses may have been directly affected by the alleged misconduct.

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