Through the analysis of 15 negative social and environmental events, the effect of sustainability-related issues on the market value of supply chain partners is investigated. Event studies were conducted on 82 companies, valuing the market reaction to the stock price of a firm due to triggering events occurring in another. The results show that while some events have caused hard reactions on the market value of the studied companies, the assessment of the general effects of each event, as well as the analysis of the whole sample, did not allow for such a conclusion. By adopting an incidental stakeholder perspective, this inquiry offers new insights into the substance of sustainability and sustainable operations management within supply chain frames.