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Moderna shares drop 25% after cancer vaccine Phase 3 data leaks ahead of official release

Market News
22 Oct 2026
Market Watch
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Bearish
Moderna shares drop 25% after cancer vaccine Phase 3 data leaks ahead of official release

Moderna's stock fell sharply by 25% following an unauthorized leak of Phase 3 data for its experimental cancer vaccine developed with Merck. The data was expected to be officially presented at a medical conference this weekend. Merck's shares also declined by 1.4% amid the news. This leak could impact investor sentiment ahead of the formal data release and regulatory review.

Following the leak of Phase 3 data for Moderna's cancer vaccine, Moderna's stock on Pluang dropped significantly, trading at USD 190.28 with a 1-day change of -22.59% as of Oct 23, 2026 01:21 WIB. Merck's shares also declined but more modestly, priced at USD 148.44 with a 1-day change of -0.99%. Investor activity on Pluang shows a majority selling Moderna (57%) and Merck (63%), reflecting cautious sentiment.

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