A companion piece to Wikibon's Public Cloud Market Forecast 2015-2026, this research examines the revenue from SaaS, IaaS and PaaS vendors. The competitive environment surrounding the Public Cloud is in flux. SaaS remains turbulent with new entrants successfully gaining share and incumbent licensed software providers trying to develop SaaS offerings and reclaim leadership positions they have maintained for a decade or more. The IaaS segment leadership is beginning to crystalize as a function of scale, but PaaS is just formulating and finding its way. As such, enterprises need to be wary of which providers are winning and losing (and where), but more importantly what they themselves intend to accomplish with Public Cloud.