MacArthur Foundation - Measuring Impact of Catalytic Capital

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MacArthur Foundation·macfound.org/press/perspectives/measuring-the-impact-of-o...

Credibility Rating

4/5

High(4)

High quality. Established institution or organization with editorial oversight and accountability.

Rating inherited from publication venue: MacArthur Foundation

This resource is tangentially relevant to AI safety as background on how major philanthropies like MacArthur measure impact of strategic capital deployment; useful context for understanding funding ecosystem dynamics around AI safety initiatives.

Metadata

Importance: 12/100organizational reportanalysis

Summary

This MacArthur Foundation perspective piece discusses methodologies and frameworks for measuring the impact of catalytic capital — investments designed to take on higher risk or accept lower returns to enable social and environmental outcomes that conventional capital cannot achieve. It explores how foundations assess whether their non-traditional financial tools are achieving intended systemic change.

Key Points

•Catalytic capital refers to investment tools (grants, loans, guarantees) that accept atypical risk/return to unlock broader social impact.
•Measuring impact of catalytic capital requires different frameworks than traditional financial returns, focusing on systemic and leverage effects.
•The piece examines how foundations track whether their capital successfully mobilizes additional investment or enables market development.
•Challenges include attribution, time horizons, and capturing indirect effects of catalytic interventions.
•Relevant to AI governance discussions about how philanthropic capital can catalyze safety-focused research ecosystems.

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# Measuring the Impact of Our Catalytic Capital

January 15, 2026[Perspectives](https://www.macfound.org/whatsnew/latest-news?content_type=perspectives)[Impact Investments](https://www.macfound.org/programs/field-support/impact-investments/)

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Impact measurement and management challenges every investor should consider, and the principles, and key practices MacArthur uses as we assess the results of our impact investments.

The practice of impact measurement and management (IMM) is important to the impact investment field and yet, inherently difficult and complex. While all impact investors can tap a growing and helpful body of management and measurement expertise and tools, critical challenges and choices remain.

Over the last year, the development of our [IMM report](https://www.macfound.org/media/article_pdfs/C3-IMM-report-2025-v7-download.pdf) on MacArthur’s Catalytic Capital Consortium (C3) investments was an opportunity to reflect on our approach, process, and the lessons we learned along the way.

In our view, aggregation, attribution, and analysis are three critical challenges for every impact investor to consider. In addition, we have identified several key IMM principles and practices we use to monitor, support, and learn from an [active portfolio](https://www.macfound.org/programs/field-support/impact-investments/) of approximately 80 various impact investments totaling $400 million.

## Three Critical Measurement and Management Challenges for Every Impact Investor

### Aggregation

* * *

Combining quantifiable “units” of impact within an impact investment portfolio is intuitively appealing but complicated by several factors. For a set of investments within one impact sector, standardized metrics may be tracked and added together for portfolio-level statistics (e.g., tons of greenhouse gas emission avoided or number of housing units constructed).

But the funds, businesses, and nonprofits within MacArthur’s impact investments portfolio collectively address all 17 of the [United Nations Sustainable Development Goals (SDGs)](https://sdgs.un.org/goals) across diverse fields, including climate solutions, affordable housing, community development, and smallholder farming in emerging markets, among many others

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