Benzinga's Volume Movers

Arbitron

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

announced its plans to buy Arbitron for $1.26 billion. American Railcar Industries

shares climbed 5.34% to $33.94. The volume of American Railcar shares traded was 609% higher than normal. American Railcar offered to buy Greenbrier Companies

for $542.9 million. Tronox

shares gained 8.75% to $18.89. The volume of Tronox shares traded was 357% higher than normal. Tronox's 52-week trading range is $ 14.12-$175.00. Carnival plc

shares rose 1.64% to $40.93. The volume of Carnival shares traded was 327% higher than normal. Carnival scheduled a conference call on Q4 earnings for December 20, 2012.