One of the most promising and cost-effective strategies for improving California's production of baccalaureate holders is to increase transfer from the state's 114 community colleges to the 23 California State Universities (CSUs) and other four-year institutions. Since most of the state's underrepresented populations start their postsecondary education at community colleges, strengthening transfer will also help diversify the supply of baccalaureate holders. This research aims to identify strategies for increasing transfer among "high-leverage learners" in California Community Colleges -- individuals who have completed all or most of their transfer requirements, but who do not make it "through the gate" to a four-year institution. The study specifically focuses on the Inland Empire and Central Valley, as students in these areas of the state have lower transfer rates, suggesting that they may face unique challenges and barriers in their transition from community college to university. This brief addresses the quantitative research to better understand the transfer landscape for high-leverage learners, determining: (1) how many students in California arrived at or near the transfer gate, but did not go through; (2) who they are and where they reside; and (3) what we can glean about opportunities to increase their transfer success.