Check out which companies are making headlines after the bell Wednesday:
Advanced Micro Devices - The chipmaker said CEO Rory Read had stepped down and would be replaced by Chief Operating Officer Lisa Su, effective immediately. The company said Read would stay on to guide the transition until the end of the year.
Gap - Shares slid more than 8 percent after the retailer said CEO Glenn Murphy, who guided the company's rebound, will step down in February. Gap named Art Peck as his successor.
Alcoa - Shares jumped after the aluminum producer handed in earnings and revenue that topped analysts' expectations. Net income rose more than 70 percent from a year ago.
Ruby Tuesday - The stock surged after the restaurant chain posted better-than-expected quarterly results and raised its full-year sales outlook. Shares gained nearly 20 percent in extended-hours trading.
Chimerix - Shares edged higher in after-hours trading following a regular-session decline of nearly 1 percent lower. The stock tumbled after a Texas official said an Ebola patient being treated with the company's experimental drug had died.
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