Measuring the Impact of MacArthur’s C3 Investments: An Impact Measurement and Management Update

The C3 initiative includes a portfolio of Field Partnership investments made by the John D. and Catherine T. MacArthur Foundation to support 15 funds focused on a range of geographies and sectors, including climate, social justice, health, and economic opportunity. In a 2026 report, the foundation explains that these investments are performing well from both a financial and impact perspective, while offering powerful examples of the use of catalytic capital.