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Companies are recently facing increasing supply chain disruptions that may influence their supply base design choices. However, studies investigating how these choices affect the effectiveness of other supplier management practices, such as supplier integration, are scarce. The aim of this paper is to explore the impact of various types of supplier integration on the buyer's efficiency and innovation, as well as the contingency effects of supply base concentration, an important supply base design choice. Drawing upon Social Exchange Theory, we argue that the expected benefits of supplier integration activities to efficiency and innovation are strengthened by supply base concentration. We test our hypotheses using data collected from 324 manufacturing plants. Hierarchical regression results reveal that some supplier integration types improve performance only under higher levels of supply base concentration …