By the Numbers

Stocks on the Move Now: Amazon Dives

By The Numbers | Stocks on the Move Now

Shares of plunged Wednesday, after the e-commerce giant reported lower-than-expected fourth-quarter revenue, leading many analysts to reduce their price targets. 

To the upside, Medivation stock rose sharply as the biopharmaceutical company reported that an experimental drug against advanced prostate cancer extended patients' lives in a second late-stage clinical trial.

Here is a look at some of the companies showing unusual moves in Wednesday's trading session .