This document discusses a project called BTAU that aims to support small and medium enterprises (SMEs) within Natura 2000 sites in Poland, Bulgaria, and Hungary. The objectives are to contribute to long-term management of Natura 2000 by creating a new biodiversity investment market and establishing Biodiversity Technical Assistance Units and a Biodiversity Financing Facility. SMEs are important for rural economies but face constraints implementing Natura 2000. The project developed ways to identify businesses compatible with Natura 2000 and is designing financial instruments to support "pro-biodiversity" small businesses.