•Provide useful empirical evidence of value relevance of Suppliers Portal assimilation.•Suppliers Portal assimilation using a holistic view of considering factors from TOE framework and others theories.•Comprehensive set of variables that could affect the assimilation technology. This study aims to analyse the relationship of assimilation of suppliers portal, integration of supply chain and performance. The understanding of effect magnitude (direct or indirect) whose variables related to assimilation of IT have on the integration of supply chain and value creation for organizations may represent an important contribution to the development of management practices that enable the creation of a work environment that is receptive to the effective use of a new information system. The method applied for research was quantitative being conducted a survey with 95 suppliers of a company in the automotive segment was carried out. The results indicated that the technological factor and environment had greater effects on assimilation of the collaborative platform. Another important result is that the constructs analysed in the research explain 46.7% of the variation of assimilating the collaborative platform.