# Moderna stock plummets after melanoma vaccine data leak

Moderna's stock dropped 25% after unverified data surfaced on X. The data concerns its melanoma vaccine with Merck. Merck's stock fell only 3%.

https://www.expansion.com/estilo-vida/salud/2026/10/23/pasado-espera-desplome-bolsa-vacuna-melanoma-moderna.html

Image: https://e00-expansion.uecdn.es/assets/multimedia/imagenes/2026/10/23/17927530973838.jpg

Image: https://e00-expansion.uecdn.es/assets/multimedia/imagenes/2026/10/23/17927530973838_150x0.jpg

#stock #vaccines #merck #moderna #melanoma

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Created: 2026-10-25T17:21:11.458399+00:00

Last edited: 2026-10-25T17:21:11.458399+00:00

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Original source: https://www.expansion.com/estilo-vida/salud/2026/10/23/pasado-espera-desplome-bolsa-vacuna-melanoma-moderna.html