Shares of the following companies are showing unusual moves in Tuesday's trading session .
Among the winners, VOXX International rose sharply after the maker of audio equipment reported better-than-expected earnings results after the bell Monday.
To the downside, WebMD fell on news that the healthcare information website said CEO Wayne T. Gattinella has resigned, and expects lower earnings in 2012.
By The Numbers | Stocks on the Move Now
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