Investors could be missing out on the next Richard Branson as a whole pool of up-and-coming businesses are being ignored, says Nadja Franssen of Dutch pension fund SPF Beheer. The SRI investment specialist believes small and medium-sized enterprises (SMEs) in emerging and frontier markets can offer strong, sustainable returns but investors are mainly focused on companies at opposite ends of the business scale. "Often the poorer portion of the business population can tap into micro-financing and the richer and bigger businesses can call on the normal financial system," Franssen says. "However, there is one group in between that doesn’t really have access to anything and that’s the SMEs."