Benzinga's Volume Movers

surged 31.27 percent to $10.37. The volume of Opower shares traded was 19611 percent higher than normal.

announced plans to acquire Opower for $10.30 per share in cash.

shares climbed 2.87 percent to $25.06. The volume of GNC Holdings shares traded was 227 percent higher than normal. GNC reported that it has commenced strategic and financial review to increase shareholder value.

shares moved up 7.33 percent to $24.75. The volume of CEVA traded was 208 percent higher than normal. CEVA reported better-than-expected Q1 earnings.

shares rose 7.75 percent to $13.35. The volume of Navios Maritime Midstream Partners shares traded was 192 percent higher than normal. Navios Maritime Midstream Partners shares have dropped 26.95 percent over the past 52 weeks, while the S&P 500 index has slipped 2.04 percent in the same period.