AMD is now down 9.7% AH on news of CFO Thomas Seifert's resignation. The selloff comes even though AMD insists Seifert's departure wasn't due to any disagreement over the company's books. It could reflect a lack of confidence in CEO Rory Read, whose first year at the company hasn't gone swimmingly. "Thomas leaving is a big deal. He was pretty well-liked by investors. He was viewed as the rock throughout all the changes, says Evercore's Patrick Wang.