Here are links to ServiceNow's latest (full) S-1/A filing with the SEC:
http://www.sec.gov/Archives/edgar/data/1373715/000119312512274253/d301887ds1a.htm
Here are links to articles on the IPO:
Bloomberg: http://www.bloomberg.com/news/2012-06-29/servicenow-advances-in-debut-after-210-million-ipo.html
Retuers: http://www.reuters.com/article/2012/06/28/servicenow-ipo-idUSL2E8HSK1M20120628