American Eagle Outfitters was among the New York Stock Exchange's biggest decliners, plunging 14.4 percent to $13.53. The previous 52-week low was $15.45. The retailer was downgraded by Oppenheimer to "perform" from "outperform." In a research note, Roxanne Meyer, retail analyst at the firm, cited McGalla's departure, fashion misses and the weak economy as the catalysts for the downgrade.