Shares of Atai Life Sciences NV ATAI, -30.80% tumbled about 44% in premarket trading on Friday after the company said a Phase 2a clinical trial evaluating a ketamine therapy for treatment-resistant depression did not meet the primary endpoint. Atai’s stock has declined 60.1% over the past year, while the S&P 500 SPX, +2.28% is down 19.0%.
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