
By Nadia Damouni NEW YORK | Wed Feb 22, 2012 11:32am EST NEW YORK (Reuters) - A series of technology companies, including security software maker Palo Alto Networks, are preparing to go public on the heels of Facebook's $5-billion filing, sensing a window of opportunity as the stock market rallies. Technology management software maker ServiceNow, human resources software provider Workday, machine data software company Splunk and flash memory maker Violin Memory are also in various stages of planning public offerings this year, sources familiar with the matter said.These companies are expected to be valued at $1 billion and higher, they said.Palo Alto Networks, the largest of these firms, is expected to start the process of picking bankers as soon as this week to underwrite its ...
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