What happened: AMD (AMD) stock soared 10% to new highs in premarket trading on Friday. What’s behind the move: D.A. Davidson upgraded shares of the chipmaker to a Buy rating from Neutral following rival Intel’s (INTC) strong quarterly results and outlook. Intel’s results highlight the pivotal role central processing units (CPUs) play amid growing demand for AI agents, or bots that act on users’ behalf. "CPU is reinserting itself as an indispensable foundation of the AI era, and the once sleepy CPU market ...