We ask some of the top venture investors to recommend up-and-coming US-based fintechs, with one catch: They couldn't suggest companies in their own portfolios. We got a wide range of answers, but one theme was startups that cater to the underserved or unbanked. Talk to any venture investor long enough, and they're likely to eventually pitch you on a startup in their portfolio. It's natural for them to want to push companies they're financially tied to and have already thrown their support behind.