We find that suppliers are more likely to redact mandated disclosures when major customers have proprietary information to protect (in the form of R&D intensity, trade secrets, and nondisclosure agreements), controlling for suppliers' own proprietary cost concerns. Furthermore, the effect on suppliers' redactions is concentrated in subsamples for which customers have greater power, measured by customer size, industry leadership, and the number of suppliers. Additionally, suppliers also curtail operations-related disclosures in the management discussion and analysis (MD&A) and product- and service-related press releases when customers likely have proprietary information to protect. Overall, these findings suggest that dependent suppliers internalize their customers' disclosure incentives and curtail disclosures, catering to customers’ demand for information protection.

ABSTRACT Relationships with major customers may be advantageous to suppliers due to economies of scale and reputational benefits. In this study, we investigate whether unionization leads to disruptions in a firm's relationships with its customers. Our goal is to provide insights regarding the impact unionization has on a firm's sales relationships with its major customers. We predict that major customers will shift purchases away from suppliers that unionize to avoid potential disruptions. Using a difference‐in‐differences research design, our results show a negative association between supplier unionization and sales to major customers. Our findings are robust to addressing endogeneity concerns through a propensity score matched analysis and regression discontinuity research design. In addition, we find that supplier firm performance declines subsequent to unionization. We also find that suppliers experience significant increases in their cost of goods sold and the number of employees after supplier unionization, suggestive of higher input prices driving the disruption with major customers. Finally, we provide evidence that higher switching costs mitigate the decline in sales to major customers. Overall, our findings suggest that employee unionization can adversely affect a firm's relationships with their major customers.