The On Think Tanks annual State of the Sector Report provides a comprehensive assessment of the think tank landscape worldwide. This 2025 edition is the sixth publication in the series. Drawing on survey responses from over 300 organisations across more than 100 countries, it offers a comparative perspective on the key factors shaping think tanks’ sustainability, impact, and prospects for the future. The Nairobi edition presentation is a conversation that brings together think tanks/policy research organisations and funders based in Nairobi to dive into the findings and explore actionable insights from the 2025 State of the Sector Report.