Investing in the Age of AI
ESG ImpactArticles

Just How Big Is the Market for Impact Investing?

Published: August 21, 2021
Modified: August 14, 2025
Key Takeaways

The Latest ESG Data: Chart shows growth in thematic ESG fund flows

Although a widely accepted definition of impact investing has emerged from the Global Impact Investing Network (GIIN), there are still many measurement frameworks. In line with this divergence in understanding and measuring impact investing, there is currently no perfect methodology for determining the size of the Sustainable Investment (SI) market. One estimate was released by the GIIN in June 2020 that put the size of the impact market at USD 715 billion.

Thematic SI investments, which focus on identifying opportunities in macro-level sustainability trends and themes, provide another reasonable proxy for assessing market trends for impact investment while being broader than the impact domain. Figure 1 below shows clear, sizable growth in thematic ESG fund flows since 2017.

Meanwhile, the International Finance Corporation – a thought and practice leader in the world of impact investment – estimates that investors in public and private markets can potentially contribute USD 8.8 trillion and USD 71 billion respectively towards impact, as shown in Figure 2.

In the same report, the IFC also highlights the significant increase in the Assets under Management (AuM) at “impact-branded” publicly traded funds. The phrase “impact-branded” is an important one to note at this time of rapid growth in, but slow standardization of, the impact market, as it highlights the lack of certainty as to whether what investors are calling “impact” actually qualifies as this. Regardless of the terminology used or framework you prefer, it is clear that the opportunity within impact investing is vast and is only growing.

Research and Insights

Latest news and articles

Regulatory Compliance

Sustainable Finance Regulation in 2026: Fragmentation, Data Gaps, and the New Reality for Investors

Are we entering a new era of pragmatic complexity, or simply losing the thread of the sustainability agenda? With this question, Lorenzo Saa, Chief Sustainability Officer at Clarity AI, opened a recent conversation with Patricia Pina, Clarity AI’s Chief Research Officer, and Cornelius Müller, Policy Officer at the Sustainable Banking Coalition. The group discussed over…

Climate

The Climate Risk Toolkit: Scenarios, Models, and Getting it Right

Climate risk disclosure has shifted from a differentiator to the baseline, and the expectations keep moving. Institutional investors must now disclose and manage climate-related risks across multiple warming scenarios. The challenge is how: Join us to explore how financial institutions are operationalising climate risk through scenario analysis, forward-looking metrics, and AI-driven workflows. Through real case…

AI

What AI Adoption Really Looks Like in Finance: A Conversation at the NYSE

Clarity AI's Lillian Freiberg joins FintechTV at the NYSE to discuss AI adoption, mandate execution, and smarter investment workflows.