The transparency of sustainability practices has become essential for communication between companies and their stakeholders. GRI reports, by their nature, can be a necessary tool for this disclosure. This article, therefore, aims to investigate how sustainability practices reported in GRI reports make the sustainability of your supply chain transparent. The methodology used was exploratory qualitative, and the data were extracted from the sustainability reports of companies listed in the Bovespa yearbook (B3) and analyzed by my content analysis technique. The results reinforce the initial proposition that companies' sustainability GRI reports can be used to identify green supply chain management practices, which are associated with the main organizational activities and standardized by the GRI manual.