The sudden departure of Rackspace Hosting 's ( RAX ) CEO sent the company's stock down Tuesday after the cloud computing service provider late Monday reported in-line Q4 earnings and forecast in-line 2014 revenue. Rackspace CEO Lanham Napier, 43, said he would retire to advise startup companies. Graham Weston, Rackspace's co-founder and chairman, will serve as interim CEO. Napier plans to stay on as a consultant during a transition period, the company said. Rackspace stock was down 11% in early trading in the stock market today, near 36. Rackspace stock is down 110% in the past 52 weeks. "The change in leadership will likely cause disruption at the company and could create additional doubt for investors," said Michael Bowen, analyst at Pacific Crest Securities, in a research report.