Diversion-patients who sell or share their medication-is a much debated problem of opioid substitution treatment. We study regular diversion by patients at 11 OST programs in the South of Sweden. Using quantitative and qualitative data, we investigate whether those patients differ from other patients, their motives for and means of diversion, and who the recipients are. Regular diverters are a small, yet heterogeneous group. Continued illicit drug use, however, stand out as a common risk factor. Pecuniary need and a desire to help friends are other important motives. The client base mainly consists of people from the regular diverters' own drug milieus.