Veeva Systems (VEEV) took just a touch longer at 6 years and did it with remarkable capital efficiency. Founded 2007. Raised $4m from VCs. IPO in 2013. Opened at $2.4b mkt cap, closed day at $4.5b, $5.6b today.
by being super specialized, the cost of sale is massively lower. no need for an army of sales people. focus is on product and delivery/implementation - once it is proven that your stuff actually works, others take notice in a tightly knit industry.
Eli Lilly, one of our customers, just got awarded for their innovation around using our products: http://www.informationweek.com/strategic-cio/executive-insig...