Take a look at some of Friday's midday movers:
Blackstone Group - The money manger gained after saying it would spin off its financial advisory.
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Darden Restaurants - The parent of Olive Garden wavered after activist shareholder Starboard Value led a successful effort to oust the entire board.
Dave & Buster's Entertainment - The combo restaurant-arcade chain rallied its its market debut.
Exact Sciences - The biotech soared after the federal government agreed to reimburse its new colon-cancer test at the rate it asked for.
GT Advanced Technologies - The company's shares plummeted after it asked a bankruptcy court for approval to close its synthetic-sapphire operations.
J.C. Penney Company - The retailer fell after Maxim Group downgraded its shares to sell from hold.
Micron Technology - The chipmaker fell along with competitors including Intel, Texas Instruments and Xilinx after Microchip Technology lowered its second-quarter forecast.
Public Service Enterprise Group - The utility and rivals including Exelon, Consolidated Edison, Duke Energy and Integrys Energy Group gained as investors looked for a safe haven.
Ryder System - The supplier of transportation management fell along with others in the transport sector including Union Pacific, Norfolk Southern, Delta Air Lines and JetBlue Airways.
Tesla Motors - The electric-car maker declined after unveiling a new version of its Model S sedan.
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