FeesSafety
Pluang+

Moderna shares plunge 25% after early leak of melanoma vaccine data despite positive results.

Market News
22 Oct 2026
24/7 Wall Street
View Source
Bearish
Moderna shares plunge 25% after early leak of melanoma vaccine data despite positive results.

Moderna's stock dropped 25% after a late-stage melanoma vaccine report was briefly posted online and then removed. The vaccine, developed with Merck, showed favorable results in reducing melanoma recurrence or death when combined with Keytruda, but the leak sparked heavy selling due to high expectations. Despite the drop, Moderna shares remain up 526% year-to-date. Investors await a full presentation at the European Society for Medical Oncology (ESMO) Congress for clearer insights, while BioNTech and Pfizer saw smaller stock movements amid the news.

Moderna's stock is down 24.94% on Pluang as of Oct 23, 2026 01:11 WIB, closely matching the reported drop. BioNTech shares also fell slightly by 1.37%, while Pfizer edged up 1.34% during the same period. Merck's stock dipped 1.36%, with Pluang showing a typical hold time of 96 days for Merck investors.

More News (MRNA)

banner-footerbanner-footer

Invest & Trade with
#1 Award-Winning Investment Super App