This paper seeks to contribute to the existing business strategy and the environment literature by investigating the disclosure practices of biodiversity/extinction (B/E) and threatened species. We use greenwashing theory to understand global companies' motivation to report on B/E information. Data are collected from 200 Fortune Global companies for 3 years. We develop our comprehensive 53 disclosure index and create and test OLS regression model to measure the relationships between B/E disclosures and its determinants factors including environmental performance, industry sector, country, assurance, environmental awards, presence of biodiversity partners, and the number of species' related disclosure. Our results reveal that there are positive significant relationships between B/E disclosure and assurance provided by the Big 4: gaining an environmental award, companies from high biodiversity risk sectors, developing countries, presence of biodiversity partners, and how many specific biodiversity words are published in companies' reports. On the other hand, there are positive insignificant relationships between B/E disclosure and assurance: poor performers and the number of species disclosed in companies' reports. Our findings have important implications for regulators and policymakers. Our evidence appears to be robust when controlling for possible endogeneities.