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Stock Market Today, Oct. 22: Moderna Stock Plummets 18% on Melanoma Vaccine Data Leak Reports

Biztoc.com · 2026-10-22

Moderna (NASDAQ:MRNA), an mRNA medicines and preventive vaccine developer, closed at $202.63, down 17.57%. Reports of a possible leak of late-stage personalized melanoma vaccine data sent shares lower today. Investors are waiting for the planned full Phase 3 …

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