Hybrid forms of governance receive special attention in literature on regulatory reforms. It is often assumed that a combination of public and private sector involvement in a regulatory regime is superior to "pure public" or "pure private" regimes. By paying close attention to such hybrids, this article finds that hybrids have two key dimensions: first, the "amount" of public and private sector involvement in a hybrid, and second, the relationship between these sectors. Contrary to the former dimension, the latter hardly receives any attention in scholarship. This article addresses that knowledge gap. It introduces a typology of hybrids based on these two dimensions. A brief case study is introduced to discuss the value of the focus on relationships between public and private sector service providers.