From 2016-2023, College Futures Foundation supported several California State University (CSU) campuses to partner with California community colleges in their regions to increase the number of students transferring from community colleges and completing bachelor's degrees at the CSU. In an effort to learn more about this work, College Futures Foundation partnered with Education Insights Center (EdInsights) to engage key constituents in a retrospective learning engagement about these transfer partnership efforts. This report serves to both document and share these learnings, and to provide relevant information to those interested in forming intersegmental transfer partnerships, potential funders, law and policymakers, and researchers. College Futures Foundation identified five intersegmental partnerships for the authors to invite into this learning engagement. Through this process, the authors sought to answer the following questions: (1) What compelled partners to work together on transfer?; (2) What did partners undertake during their grant periods?; and (3) What attributes foster a successful intersegmental transfer partnership?