“…Hypothesis 1 proposes a negative stock market return associated with a supply chain glitch. Similar studies have examined stock market returns to publicly announced events using the event study method (Brandon-Jones, Dutordoir, Frota Neto, & Squire, 2017;Modi, Wiles, & Mishra, 2015). Because prior studies provide excellent summaries of this method (Kothari & Warner, 2006;MacKinlay, 1997;McWilliams & Siegel, 1997), we limit our discussion here to a brief summary of the steps we undertook.…”