HCA Holdings - The provider of health care gained after raising earnings guidance for the second quarter and year. Tenet Healthcare, United Health Services, Community Health Systems, Lifepoint Hospitals and Envision Healthcare Holdings also rose.
JB Hunt Transport Services - The freight company climbed after Credit Suisse upgraded the stock to outperform from neutral.
Lannett - The provider of generic prescription pharmaceuticals declined after saying it had received a subpoena from Connecticut's attorney general into the company's pricing of digoxin, a treatment for heart trouble.
Northern Trust - The bank declined fell after reporting second-quarter results.
St Jude Medical - Shares fell slightly after the maker of heart-rhythm devices reported quarterly earnings.
Tesla Motors - The maker of electric cars declined after saying it would name its planned small car the Model 3.
Western Digital - The digital-storage company gained after Robert Baird upgraded the stock to outperform from neutral.
(Read More: See CNBC's Market Insider Blog)
—By CNBC's Rich Fisherman.
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