The Impact Investor is a project to build data-driven and practitioner-guided knowledge for the rapidly growing field of impact investing. It is a partnership between InSight, the Center for the Advancement of Social Entrepreneurship at Duke University, and ImpactAssets. It is supported by the Omidyar Network, the Annie E.Casey Foundation, the RS Group (Hong Kong), the F.B. Heron Foundation, and Deutsche Bank. The second report in the project seeks to identify and define the evolving tensions within impact investing classifying these as Six Dynamics, each of which describes a unique set of relationships, challenges and questions that underpins a deeper understanding of the best practices required to deliver blended financial and social returns successfully.