JPMorgan, Morgan Stanley, and Goldman Sachs execs gave us an inside look at how they're slashing the time and cost of bringing fintechs onboard as Wall Street looks to newcomers for innovation

· As banks are more willing to work with fintechs, they're rethinking their approach to the young companies.
· Business Insider spoke to execs at JPMorgan, Morgan Stanley, and Goldman Sachs to understand how the Wall Street titans have overhauled their approach to working with startups. 
· From quick ways to prove out a...