When I wrote about Q2 Holdings (NYSE: QTWO) in January as one of the five platform companies I love, it was the only one of the five stocks trailing the market, but that has changed. The company's 29% growth for full-year 2017 has lifted the stock's performance, and management's comments in the most recent earnings call show Q2 Holding's is just starting.Read on for how this company -- which offers a cloud-based financial solutions platform -- is winning and retaining customers, attracting new end-users, growing its product portfolio, and expanding its addressable market.Continue reading