To achieve the health-related Sustainable Development Goals, additional investments of ~140 billion annually is required. Official Aid Flows alone will not be enough to close the investment gap. Convergence supported the Bill and Melinda Gates Foundation's Investor and Policy Lab on Private Finance and Returnable Capital for Health, which convened a unique blend of over 75 health-focused participants. Participants included suppliers of different types of capital (private equity funds, insurance organizations, aid agencies, multi-lateral agencies, foundations), intermediaries matching the supply and demand for capital (financial intermediaries), and demanders of capital (services providers and NGOs). Think tanks and management consulting firms brought additional ecosystem perspective. The diversity of stakeholders created a unique environment that highlighted a range of stakeholder perspectives and approaches. The Lab focused on the role public and private investors can play in closing the health funding gap.