In this chapter, the authors study how collaborative workspaces influence work in the sharing economy. They compare two types of shared workspaces, coworking and cohoming, and ask how much “co-” is happening within them. Using ethnographic data, they develop a typology of co- activities within collaborative workplaces and expand on the nature of the activities in each space. They discuss the modes of exchange and the relationships emerging within both collaborative workplaces, and show how the structures and norms of cohoming and coworking influence these relationships. Collaborative workplaces are increasingly popular; it is critical to understand how they impact work practices, productivity, and well-being. This chapter advances the conceptualization of workspaces within the sharing economy.