Not a huge surprise given the absolute face ripping jump MRNA had when the vaccine was first announced. The ~$20B company jumped 174% overnight, and then climbed another 70% over the last two months, now only dropping 18% on this news.
To illustrate how much they've gone up, this 18% drop is just slightly less than their entire market cap in June (four months ago)
To illustrate how much they've gone up, this 18% drop is just slightly less than their entire market cap in June (four months ago)