In this article, we suggest that the transactive memory system (TMS) and boundary-spanning literatures are useful for understanding how individuals in team-based collectives can be structured to improve within- and between-team coordination. We argue that such coordination can be facilitated—or thwarted—by boundary-spanning behaviors and patterns of knowledge exchange within and between teams. Our theorizing explains how an existing team TMS can offset the within-team coordination burdens typically associated with boundary spanning and we offer predictions about how these factors interrelate to affect TMS and coordination over time. Finally, our theory underscores significant implications and provides insights for how management practices might improve coordination within and between teams.