Benzinga's Volume Movers

Carnival plc

shares moved up 1.85% to $40.68. The volume of Carnival shares traded was 850% higher than normal. Carnival reported better-than-expected fiscal third-quarter earnings and raised its FY14 forecast. CF Industries Holdings

surged 2.91% to $263.23. The volume of CF Industries shares traded 415% higher than normal. CF shares gained on confirmation of merger talks with Yara International ASA

. Salix Pharmaceuticals

shares climbed 5.51% to $168.64. The volume of Salix Pharmaceuticals shares traded was 329% higher than normal. Allergan

is set to acquire Salix Pharmaceuticals in a deal probably worth more than $10 billion, according to Dow Jones Newswires. Alcobra

shares rose 3.65% to $21.00. The volume of Alcobra shares traded was 326% higher than normal. Alcobra shares have jumped 34.35% over the past 52 weeks, while the S&P 500 index has gained 17.49% in the same period.