Often the case is that the market behaves the opposite of what the man in the street expects. Short term investors enjoy a product run up in stocks of all kinds, then sell and take profits--called "profit taking." The only "decision" investors like this make is when to sell to maximize their profits--it's certainly not a comment on the Ryzen release at all... Don't look to short-term investors to tell you much about products or companies--they are all in it for the quick buck. "Serious investors" jump in for the long term. AMD's P&L for the rest of the year will decide the value of the stock this year.