SumZero is an investment website for professional investors (collectively referred to as the "buyside"), and buyside professionals are granted membership per an application, where they must be on the research team at a hedge fund, mutual fund, private equity fund, or investment banking proprietary trading desk. Its exclusivity is said to mirror that of Facebook at its outset, and though it currently has over 10,000 buyside members and over 40,000 'Basic' users, roughly 75% of buyside applicants for membership are rejected. The sites co-founder and current CEO Divya Narendra came up with the idea for SumZero in April 2007, while working for the hedge fund Sowood Capital in Boston. Narendra and college friend Aalap Mahadevia subsequently launched SumZero in March 2008. In June 2012, Winklevoss Capital made an angel investment of $1.05 million into SumZero.