Imperva, Inc., which offers data security used to protect files in data centers and cloud computing environments, filed on Friday with the SEC to raise up to $75 million in an initial public offering. The Redwood Shores, CA-based company, which was founded in 2002 and booked $60 million in sales for the 12 months ended March 31, 2011, plans to list on the NYSE under the symbol IMPV. J.P. Morgan and Deutsche Bank Securities are the lead underwriters on the deal. No pricing terms were disclosed.