The growth of impact investing as a method of addressing some of the global social challenges is creating opportunities for the capital market participants to engage in investment with financial, social, and environmental returns. This paper analyzes the Social Return on Investment (SROI) study of a health care project in Kenya to highlight SROI as one of the measures of a social return and to demonstrate the need for expansion of impact investing. It also proposes the need for the global financial market to create additional financial instruments to attract more private investors to finance social and environmental challenges.