This article explores the role of the diversity of the domestic financial networks for the internationalization of entrepreneurial ventures in transition economies. Building on network theories of social exchange and resource dependency, it hypothesizes that the diversity of the entrepreneurial venture’s financial network will have a positive effect on internationalization and this effect will be amplified by the diversity of the entrepreneur’s personal network and the size of the new venture. A survey data collection methodology is used and three hypotheses are tested on a sample of new and small ventures in Bulgaria. Regression results show that the diversity of the domestic financial network has a positive effect on internationalization, and that its role increases with the size of the new venture. Implications for the theory of small firm internationalization, managerial practice and public policy are discussed.