This report provides an in-depth analysis of the current size and composition of the impact investing market. The GIIN estimates the current size of the global impact investing market to be $502 billion. Based on the collation of AUM data on more than 1,300 impact investors around the world, this research also underscores the diversity of the market, capturing data from many types of investors. These include asset managers, foundations, banks, development finance institutions, family offices, pension funds, insurance companies, and others.