The field of residential care for children and youth in Sweden is often termed unstable and turbulent. During recent decades the field has been subject to many changes. In this study, the development and changes in the field of residential care for children and youth in terms of ownership structure and treatment ideas will be analysed. The study is particularly focused on the changes in ownership structure that have taken place during the 2010s. It also analyses changes in treatment ideas, and discusses how these may relate to transformations of ownership structures as well as to dimensions of institutional logics, such as legislation and other types of normative pressure from the environment. The result reveals that of the approximately 450 treatment oriented residential care units (excluding homes for refugee children), close to 80 % are today run by private companies and to a growing extent by large for-profit corporations. Paralleland possibly relatedto the changes in ownership structure, the dominant treatment ideas have changed over time. The changes in the field can be summarised as a transformation from small-scale establishments with a family logic, to large-scale establishments with a professional logic, or more specifically from a domination of small family run units with milieu therapy to big business and a focus on evidence based interventions.