Iconic computer hardware and software maker Dell, a portfolio company of Silver Lake, has filed documents to spin off subsidiary SecureWorks through an IPO. Dell had purchased the information security services provider for $612 million in 2011 from a group of VCs. The company intends to trade on the NASDAQ under the symbol SCWX. The S-1 filing revealed net losses of $57.5 million for the nine months ended October 30, compared to a $29.5 million loss during the same period the previous year. Revenue expanded in the same timeframe from $190.7 million to $245.4 million. Dell investors will retain a controlling stake in SecureWorks following the offering. Dell recently agreed to acquire EMC (NYSE: EMC) in a $67 billion mega-deal.