Benzinga's Volume Movers

shares climbed 22.04 percent to $74.11. The volume of Kythera Biopharmaceuticals shares traded was 4961 percent higher than normal.

announced its plans to buy Kythera Biopharma for $2.1 billion in cash & stock.

surged 3.94 percent to $17.15. The volume of Zhaopin shares traded 1740 percent higher than normal. Zhaopin shares have surged 11.49 percent over the past 52 weeks, while the S&P 500 index has gained 7.12 percent in the same period.

shares moved up 7.83 percent to $56.48. The volume of Hill-Rom Holdings traded was 641 percent higher than normal. Hill-Rom announced its plans to acquire Welch Allyn for $2.05 billion in cash and stock.

shares rose 8.13 percent to $71.42. The volume of Qihoo 360 Technology shares traded was 566 percent higher than normal. Qihoo 360 reported a receipt of preliminary non-binding offer to purchase the company at $77 per ADS.