Blackberry - The supplier of wireless devices declined after naming Marty Beard as its chief operating officer. Beard was most recently the CEO of LiveOps, a provider of cloud applications.
DaVita Healthcare Partners - The provider of kidney-dialysis services slid after Raymond James downgraded it to market perform from outperform.
Extreme Networks - The provider of network infrastructure equipment and services rose after projecting fourth-quarter revenue and profit above estimates.
GoPro - The maker of adventure cameras gained after JPMorgan and Piper Jaffray began coverage with overweight ratings.
Hewlett-Packard - The printer maker dropped after a former chief financial officer of Autonomy said in a court filing he opposed a settlement between HP executives and directors and shareholders over HP's acquisition of the British software company.
Itron - The provider of metering systems to utilities fell after Bank of America/Merrill Lynch downgraded it to underperform from buy.
ManpowerGroup - The staffing firm fell after reporting second-quarter results.
Monster Beverage - The beverage company fell after Morgan Stanley downgraded the stock to equal weight from overweight.
Restoration Hardware Holdings - The retailer slipped after BB&T downgraded the stock to hold from buy.
Tiffany - The upscale jeweler slid after saying its chief executive of 15 years would retire next year.
Yum! Brands - The operator of KFC, Pizza Hut and Taco Bell declined, as did McDonald's, after a Shanghai television station reported a supplier sold them expired beef and chicken in China.
(Read More: See CNBC's Market Insider Blog)
—By CNBC's Rich Fisherman.
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