This document profiles 20 privately held tech companies that the author believes have good prospects for an initial public offering (IPO) in 2015. It provides a brief overview and analysis of each company, including their market opportunity and competitiveness, funding to date, and interviews with executives. The author notes that not all of the companies will necessarily IPO, as some may be acquired, but they each have a chance to go public if market conditions are right and they can continue executing well. The purpose is to survey interesting pre-IPO companies, not to predict their success or failure on public markets.