One of the fastest-growing areas in business is socially responsible investment (SRI), which incorporates environmental, social, and governance concerns. From 2007 to 2017, SRI increased from $2.71 trillion to over $21 trillion, and in 2017, 84% of all millennials were interested in SRI. Given these trends, how should an entrepreneur with a social mission proceed? One of the first decisions is choosing an appropriate legal entity. This technical note presents an array of legal entities that a business with a social mission could consider, with special emphasis on a relatively recent option: the benefit corporation.