Benzinga's Volume Movers

American Science & Engineering, Inc. ASEI surged 13.77 percent to $36.79. The volume of American Science & Engineering shares traded was 1110 percent higher than normal. American Science & Engineering agreed to be acquired by OSI Systems, Inc. OSIS for $37 per share in cash.
Imperva Inc IMPV shares moved up 10.56 percent to $44.71. The volume of Imperva traded was 270 percent higher than normal. Elliott Associates reported a 9.8 percent stake in Imperva, according to 13D filing.
WPP plc - American Depositary Shares WPPGY shares climbed 1.33 percent to $113.94. The volume of WPP shares traded was 190 percent higher than normal. WPP shares have declined 4.46 percent over the past 52 weeks, while the S&P 500 index has dropped 1.93 percent in the same period.
Neustar Inc NSR shares rose 6.66 percent to $25.64. The volume of Neustar shares traded was 130 percent higher than normal. Neustar announced plans to separate into two, publicly-traded companies.