The equal employment opportunity (EEO) policy is an essential component of workforce diversity, equity, and inclusion (DEI) practices. This paper examines whether principal customer firms infuse EEO policy in their dependent suppliers. Specifically, using a unique workforce EEO measure based on textual analysis of online job postings, we demonstrate a lead-lag pattern of EEO policies in recruitment between customers and suppliers. This effect is stronger when the principal customers have more bargaining power against their dependent suppliers. To alleviate the endogeneity concerns, we use the introduction of California's 2018 "Women on Boards" as the exogenous shock to support a causal interpretation of our findings. Furthermore, when a supplier fails to adapt its workforce EEO practices to cater to its major customers, the supplier's negative workforce EEO incident will increase the likelihood of supply chain relationship termination, especially when the customer's EEO level is high. At last, we find that higher customer workforce EEO levels boost suppliers' innovation performance, measured by both patent quantity and quality, suggesting economic benefits associated with the diffusion of workforce EEO practices in supply chains.