The nature and economic consequences of interdependent relationships across supply chain members has been the subject of much scholarly debate (e.g., Galbraith [1952]; Porter [1974]). Prior literature documents how a company’s interactions with its supply chain partners can affect its operational and financial performance (Baiman and Rajan [2002a; 2002b]; Hertzel et al. [2008]; Fee and Thomas [2004]; Johnstone, Li and Luo [2014]). In this paper, we examine the influence of the supplier’s internal control environment on customer-supplier relationships and ask two research questions: (1) Do supplier control weaknesses increase the likelihood of customer-supplier relationship termination? (2) Does the timely remediation of control weaknesses reduce the likelihood of customer-supplier relationship termination? Although internal control research typically focuses on the implications of internal control weaknesses (ICWs) for firm-level outcomes (e.g., earnings quality: Doyle, Ge and McVay [2007b], Ashbaugh-Skaife et al. [2008]; investment and operational efficiency: Cheng, Dhaliwal and Zhang [2013], Feng et al. [2015]; public debt contracting: Costello and Wittenberg-Moerman [2011]), Kinney [2000] argues that the impact of internal controls across the value chain of customers and suppliers is important because it affects each member’s future welfare from the relationship.1