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Moderna Plunges 20% One Day After Cancer Vaccine Breakthrough Sent Shares Up 177%

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Moderna Plunges 20% One Day After Cancer Vaccine Breakthrough Sent Shares Up 177%

Moderna shares (MRNA) are down 20% as of 12:00 PM ET Thursday, marking one of the biotech sector’s largest single-day moves of 2026. The sharp repricing implies investors are reacting negatively to the latest company-specific developments, though the article provides no additional figures on earnings, guidance, or cash flows.

Analysis

Moderna shares (MRNA) are down 20% as of 12:00 PM ET Thursday, marking one of the biotech sector’s largest single-day moves of 2026. The sharp repricing implies investors are reacting negatively to the latest company-specific developments, though the article provides no additional figures on earnings, guidance, or cash flows.

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