![[Pasted image 20260716121938.png||left|200]] S. Hess, B. Spigel, M. Belitski and A. Wahl (2026). Theorizing Typologies of Entrepreneurial Ecosystems. Small Business Economics. https://link.springer.com/article/10.1007/s11187-026-01257-w Abstract: This study develops a theory-driven typology of entrepreneurial ecosystems (EEs) to better understand heterogeneity in entrepreneurial activity across places. We identify four ecosystem types — embedding, emerging, exploring, and extreme growth — based on two dimensions: structural thickness (the interdependency and density of connections among ecosystem actors and institutional factors) and locus of focus (the spatial orientation of ecosystem actors). Together, these dimensions provide a conceptual framework for understanding why ecosystems that may appear similar in their ecosystem attributes can nevertheless generate different forms of productive entrepreneurship. In addition, we provide an illustrative empirical application using data from 748 cities across 102 countries that approximates the typology and explores how ecosystem attributes are associated with the likelihood that a city exhibits a given type. By theorizing EE heterogeneity beyond resource- or scale-based perspectives, we advance research on the structural and spatial dimensions of entrepreneurship and provide a foundation for future comparative and longitudinal research.