Alcobra Ltd (NASDAQ: ADHD) -24% - The company announced the presentation of new data from a Phase III study of Metadoxine Extended Release (MDX) in adults with ADHD at the 61st annual meeting of the American Academy of Child and Adolescent Psychiatry.

IPC The Hospitalist Company Inc (NASDAQ: IPCM) -17% - On Wednesday after hours, the company reported earnings, missing estimates on both the top and bottom line.

Ultratech, Inc. (NASDAQ: UTEK) -14% - The company reported downbeat earnings pre-market Thursday.

Ait Methods Corp (NASDAQ: AIRM) -15% - The company reported preliminary third quarter guidance below EPS estimates.

Yelp Inc (NYSE: YELP) -15% - Despite beating EPS estimates for the third quarter, the company reported a fourth quarter outlook that is below expectations. In addition, multiple firms negatively adjusted their investment recommendation.

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