Fortinet, the Silicon Valley network security firm, disclosed plans on Monday to raise as much as $100m in an initial public offering, the second technology company to announce IPO ambitions in just a week.

Ancestry.com, a consumer genealogy site, filed a prospectus aimed at a $75m public offering the previous Monday. Two other companies got out the door in May: software company SolarWinds and online reservation site OpenTable. Before that, there had been no tech IPOs in nearly a year.