The Mellon Foundation has now awarded eight collaborative publishing grants to groups of university presses. At this panel, representatives from four of the collaborative groups will report on the process of working with Mellon; the core features of each collaboration, organization and management of the grant, and each press’ responsibilities; and progress to date on the major goals of the collaboration, including signings, transformative elements, cost savings, title output, and sustainability models. Each will also report on the unique challenges and benefits of collaborative publishing as well as lessons learned.