The increasing volume of waste generated globally is one of the most prominent environmental issues we face today. Companies responsible for the treatment or disposal of waste are therefore among the key actors in fostering a sustainable future. Yet the waste industry has often been characterised as a criminogenic one, causing environmental harm which disproportionately impacts the world’s most vulnerable regions and populations. In this article, we illustrate how companies operating in global supply chains exploit legal and enforcement asymmetries and market complexities to trade waste with countries where facilities for environmentally sound treatment and disposal of waste are lacking. We draw on two contemporary cases of corporate misconduct in the Global South by companies with operating headquarters in the Global North: Seatrade and Probo Koala. We compare these cases building on theories about corporate and environmental crime and its enforcement. This explorative comparative analysis aims to identify the key drivers and dynamics of illegal waste dumping, while also exploring innovative ways to make the waste sector more environmentally responsible and prevent the future externalisation of environmental harm.