Benzinga's Volume Movers - Cisco Systems (NASDAQ:CSCO), Salesforce (NYSE:CRM)

Imperva Inc IMPV surged 20.3 percent to $52.21. The volume of Imperva shares traded was 1159 percent higher than normal. Imperva shares climbed helped by rumors about International Business Machines Corp. IBM and Cisco Systems, Inc. CSCO might be interested in acquiring the company.
Planet Fitness Inc PLNT shares moved up 0.8 percent to $20.01. The volume of Planet Fitness traded was 908 percent higher than normal. Planet Fitness reported an offering of 8 million shares via selling holders.
Twitter Inc TWTR shares gained 21 percent to $22.56. The volume of Twitter shares traded was 847 percent higher than normal. CNBC's David Faber reported Twitter has "received expressions of interest from several technology companies and may receive a formal bid shortly." According to Faber, Alphabet Inc GOOG and salesforce.com, inc. CRM are among companies that may be interested in acquiring the social media company.
Yelp Inc YELP shares rose 4.5 percent to $40.20. The volume of Collegium Pharmaceutical shares traded was 355 percent higher than normal. Yelp reported the conversion of Class A and Class B common shares into a single class of stock.