Microfinance, a lead sector within the larger impact investing spectrum, has gained prominence from development-minded investors over the past decades. Initially, international funding into microfinance was generated largely from donor organizations, including public development agencies and private foundations. As the market gained traction, the role of private capital grew in importance as not only a means for microfinance institutions (MFIs) to reach scale, but also to increase their social outreach beyond what was possible with donor money. Private investors and donor agencies thus joined efforts in creating microfinance investment vehicles, better known in the industry jargon as “MIVs” or more simply “microfinance funds”. MIVs act as the main link between MFIs and the capital markets and usually provide debt financing, equity financing or a combination of both to MFIs located in emerging and frontier markets.