By the Numbers

Stocks on the Move Now

By The Numbers | Stocks on the Move Now

Shares of the following companies are showing unusual moves in Friday's trading session .

Among the winners, Cepheid rose sharply after the maker of biological testing systems forecast better-than-expected revenue figures in 2012.

To the downside, shares of Riverbed Technology plunged as the networking-equipment provider issued a weak first-quarter outlook.