This document discusses the benefits and challenges of sharing neuroimaging data. It describes several large neuroimaging datasets including the NKI Enhanced dataset and the Human Connectome Project dataset. These datasets provide rich phenotypic and imaging data for many subjects. Data sharing allows data to be reused, saves costs, and is related to higher quality studies and increased citations. However, there are also fears around data sharing such as being scooped. The document advocates for starting small with data sharing and provides resources like NeuroVault to make sharing easy.