Behold the ever expanding rings of tech’s most overhyped sector. Demand is fierce for software, hardware and consulting services that let companies process and store giant streams of varied and frequently changing information. It’s an $18 billion industry heading to $50 billion in five years, according to tech researchers at Wikibon. Make note of the names in the inner circle. They’re the pure plays with the newest science—and are likely to get gobbled up by the growth-hungry incumbents on the outside.