The Kaiser Family Foundation California Longitudinal Panel Survey is a series of surveys that, over time, tracks the experiences and views of a representative, randomly selected sample of Californians who were uninsured prior to the major coverage expansions under the Affordable Care Act (ACA). The initial baseline survey was conducted with a representative sample of 2,001 nonelderly uninsured Californian adults in summer 2013, prior to the ACA’s initial open enrollment period. The second survey in the series followed up with the same group of previously uninsured Californians who participated in the baseline (a longitudinal panel survey). The third in the series, and the focus of this report, followed up with them again after the second open enrollment period in spring 2015 to find out whether more have gained coverage, lost coverage, or remained uninsured, what barriers to coverage remain, how those who now have insurance view their coverage, and to assess the impacts that gaining health insurance may have had on financial security and access to care.