Benzinga's Volume Movers

surged 25.69 percent to $32.44. The volume of Axiall shares traded was 5816 percent higher than normal. Westlake Chemical announced plans to acquire Axiall for $33.00 per share in all-cash transaction.

shares moved up 24.76 percent to $27.59. The volume of Global Blood Therapeutics traded was 1953 percent higher than normal. Global Blood Therapeutics reported new data supporting safety and efficacy profile of GBT440.

shares climbed 3.53 percent to $46.65. The volume of Westlake Chemical shares traded was 362 percent higher than normal. Westlake Chemical announced plans to acquire Axiall for $33.00 per share in all-cash transaction.

shares rose 8.77 percent to $23.43. The volume of H & R Block shares traded was 231 percent higher than normal. H & R Block reported better-than-expected results for its fourth quarter and lifted its quarterly dividend to $0.22 per share.