Moderna (MRNA) Stock Explodes 177% After Phase III Melanoma Vaccine Trial Success

NewsThu, 20 Aug 2026 12:01:47 UTC1 hour ago
Moderna (MRNA) Stock Explodes 177% After Phase III Melanoma Vaccine Trial Success

TLDR

  • Moderna stock jumped 177% on Wednesday after positive Phase III trial results for its melanoma cancer vaccine, intismeran.
  • The move makes it only the second S&P 500 stock to more than double in a single day in 25 years.
  • MRNA is now up 491% year-to-date, second only to Sandisk among S&P 500 performers.
  • Analysts raised price targets and upgraded coverage but cautioned the good news may already be priced in.
  • The stock pulled back after the initial surge as investors weighed valuation concerns.

Moderna stock hit 177% on Wednesday following Phase III trial results for intismeran, its personalized melanoma vaccine developed alongside Merck’s Keytruda. The stock opened at a jaw-dropping gain before pulling back as investors began digesting what the move actually means.



Moderna, Inc., MRNA

The rally pushed MRNA’s year-to-date gain to 491%, making it the second-best performing S&P 500 stock in 2026. Only memory-storage company Sandisk has done better. Dell, Micron, and Seagate round out the top five.

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