Benzinga's Volume Movers

Axiall Corp (NYSE: AXLL) 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.

Global Blood Therapeutics Inc (NASDAQ: GBT) 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.

Westlake Chemical Corporation (NYSE: WLK) 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.

H & R Block Inc (NYSE: HRB) 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.