Ecoacsa Reserva de Biodiversidad and Universidad Politécnica de Madrid (UPM) have conducted an assessment across the IBEX 35 on how they publicly reported biodiversity-related information in 2019. The main conclusions and results of the analysis have been compiled in the report Nature in the Spanish stock exchange. To what extent is biodiversity relevant to the IBEX 35? The results of the 2019 biodiversity corporate performance index on reporting and disclosure of the IBEX 35 show that biological diversity is a material issue for 17 companies (48,6%). By activity sector, energy has obtained the highest score based on the sum of eight indicators taken into account to assess the correct integration of biodiversity by Spanish listed companies’ reporting and disclosure, with 53%. This sector is followed by basic materials industry (24%), consumer goods (22%), consumer services (18%), real state services (15%), finance services (13%) and technology and communications (12%).The methodology followed to followed to conduct the analysis has been developed by Endangered Wildlife Trust (EWT) in the framework of the Biodiversity Disclosure Project, which is based on publicly available data (sustainability reports published in the Spanish Stock Market Commission, biodiversity reports, websites)....