How could this not make the stock go higher?
I can tell you why. Investors, the same morons that told people to sell AMD stocks when it was down to $2 (almost everyone had a «sell rating» back then), heard Lisa Su yesterday say that Q4 will go down compared to Q3. That was all it took. These individuals, which have almost none experience with hardware, cant grasp the fact that historically Q4 usually been lower than Q3, so they freaked out. And like any mindless sheep, they do their everyday business by looking at sell and buy walls of stocks, meaning they follow the rest when a sell wall appears. Which short the stock value.
I don't know why you are so harsh on the average investors. Imagine if you invested $50-100k worth of AMD shares. You will be very careful(and paranoid).
Even at $12, its 5-6x worth its value just a few years ago. Current pricing already has future projections baked in. AMD by revenue is in no way worth 6x few years ago. I think its very possible that they can go down another 20% from now.
Do you think the alternative is better? AMD being way overpriced at $30 per share right now? They have been basically considered bankrupt by most folks for over a decade. Such opinions won't change overnight. The last peak was $40 before Conroe ruined the party. It wasn't until after the release of Athlon 64, and few years later when Intel was at its worst AMD reached that point.
A company as small and as volatile as AMD will have wildly varying share prices. Which is why institutional investors and those more serious in long term investing go for big guys like bank stocks, and if technology, more stable ones like Google, Intel, Microsoft.