The surprise vote by the U.K. in June to leave the European Union may encourage fintech firms in London to expand across the pond. That was the case with Duco, a financial data management company, which recently added senior managers in New York. "Hiring talent in London was already hard on the tech side, and we think it's going to get even harder" says CEO Christian Nentwich.

Duco was selected last year to participate in Accenture's Fintech Innovation Lab in London.