Impact investing has gained significant traction over the past few years as investors look to generate social and environmental impact alongside financial returns. According to the Global Impact Investing Network (GIIN), the market size of impact investing assets under management grew to $715 billion in 2020. As the impact investing industry matures, several leading firms have established strong track records and expertise in this space.

Leading impact investing firms like Acumen Fund and Omidyar Network
Some of the most prominent impact investing firms globally include Acumen Fund, Omidyar Network, Bridges Fund Management, BlueOrchard Finance, LeapFrog Investments etc. These firms manage billions of dollars in impact capital and have made investments across sectors like financial inclusion, agriculture, healthcare, education etc. They utilize a range of investment instruments like debt, equity and guarantees to generate social impact.
Impact measurement and management is a key focus area
A defining feature of leading impact investing firms is the rigor and transparency with which they measure and manage impact performance. For instance, Acumen has developed a lean data approach to quantify impact and has open-sourced its metrics. Such focus on impact measurement enables firms to closely track their social/environmental ROI and make course corrections if needed.
Impact strategies aim for risk-adjusted market rate returns
Unlike some other socially responsible investment approaches, top impact investing firms aim to deliver risk-adjusted, market rate returns for their investors. Hence they utilize rigorous due diligence and risk management processes akin to traditional investment firms. This commercial orientation also enables scaling of successful impact models.
Collaborations are enabling further growth
In order to channel more mainstream capital towards impact investing, leading firms are collaborating with major banks, development finance institutions, foundations etc. Such collaborations allow for innovative structures like impact bonds, pay-for-success contracts etc. that can accelerate private capital flows to critical development needs.
In summary, top impact investing firms like Acumen Fund, LeapFrog Investments and Omidyar Network are pioneering new approaches that harmonize social/environmental impact with financial returns, and aim to set benchmarks for the wider industry. As the ecosystem matures, impact investing is poised for exponential growth globally.