An important question in the business ethics literature concerns organizational response in the aftermath of an unethical business practice. This study examines factors affecting firms’ decision to take reparative action in the aftermath of an environmental violation. Specifically, we investigate environmental violators’ decision to undertake a Supplemental Environmental Project (SEP), which is an initiative that promotes restorative justice. To settle an environmental violation, the United States’ environmental regulator allows offenders the option of either paying the full penalty or a reduced (...) sum while spending additional effort and engaging in an environmental project. As predicted, we find that firms with poorer past environmental performance and greater shareholder environmental activism are more likely to engage and invest in a SEP. Additionally, there is a stronger association between shareholder activism and SEP investment when firms have poorer past environmental performance. Our findings inform regulators, stakeholders, and business ethics researchers on the factors that lead firms to undertake reparative action following unethical business practices. (shrink)