HealthWall Street Journalabout 1 hour ago
Moderna Stock Plummets After Vaccine Leak
2 min read
Moderna shares plunged about 25% after details from a closely guarded study of its experimental mRNA-based cancer vaccine appeared on social media on October 22, 2026. The sell-off put the Cambridge, Massachusetts, biotechnology company on track for its largest stock decline since going public, as investors reacted to the premature disclosure of study information.
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