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Mounting pressure for sustainable business practices has led to a greatly increased focus on highlighting sustainability drivers throughout the supply chain. While the literature has concentrated on why downstream original equipment manufacturers (OEMs) and retailers become “sustainable,” much less is known regarding why and how upstream suppliers implement sustainability practices. Based on findings from a cross‐case analysis of eight first‐tier (FT) suppliers and an integration of resource dependency theory (RDT), this study explores the drivers and mechanisms of FT supplier engagement in sustainable supply chain management. Suppliers need to understand the sustainability priorities of customers and stakeholders to derive the effective focus and depth of further upstream integration with subsuppliers. Therefore, the integration between the two functions that manage the relevant external interfaces …