How the Founders 40 list was compiled: Companies that went public since the start of 2012, with annual revenue between $50 million and $1.5 billion, are listed in reverse chronological order by IPO pricing date. Revenue from 2014 is as reported as of mid-February. Revenue growth is year-over-year for 24 months pre-IPO year. *American Homes 4 Rent revenue growth is for 18 months; Workday is for 25 months.

Data sources: Renaissance Capital; SEC filings; companies.

Research: Victoria Castro, Marli Guzzetta, Jeremy Quittner, Thompson Wall