Benzinga's Volume Movers

shares climbed 39.60 percent to $14.49. The volume of Voltari shares traded was 936 percent higher than normal. Voltari shares have jumped 185.17 percent over the past 52 weeks, while the S&P 500 index has gained 11.75 percent in the same period.

surged 8.85 percent to $74.07. The volume of Mylan shares traded 747 percent higher than normal.

has proposed to purchase Mylan for $82 per share in cash and stock,

shares moved up 8.23 percent to $37.48. The volume of Fortinet traded was 730 percent higher than normal. Fortinet reported stronger-than-expected results for the first quarter.

shares rose 12.61 percent to $14.38. The volume of Rambus shares traded was 672 percent higher than normal. Rambus reported upbeat Q1 earnings.