Benzinga's Volume Movers

Arbitron (NYSE: ARB ) shares moved up 23.61% to $47.02 at 10:40 am. The volume of Arbitron shares traded was 37185% higher than normal. Nielsen Holdings NV (NYSE: NLSN ) announced its plans to buy Arbitron for $1.26 billion. American Railcar Industries (NASDAQ: ARII ) shares climbed 5.34%