Merck

Moderna Stock Crashes 25% in Its Worst Day Ever: Leaked Cancer Vaccine Data Wipes Out $24 Billion

2026-10-22

Moderna stock fell about 25% — its worst day on record Moderna (NASDAQ: MRNA) shares sank more than 25% on Thursday, October 22, 2026 — last down 25.2% at $183.88 in Reuters' reporting, on pace for...