The U.S. Department of Labor's (DOL) American Apprenticeship Initiative (AAI) supported 46 grantees across the country to expand registered apprenticeship into new sectors, such as healthcare, and to populations historically underrepresented in apprenticeships. DOL commissioned an evaluation of the AAI grants to build evidence about the effectiveness of registered apprenticeship for apprentices and employers. This report presents findings from the outcomes study of that evaluation. It examines the characteristics, reasons for enrollment, program experiences, and post-program outcomes of AAI apprentices and pre-apprentices. The data sources include an AAI Apprentice Survey administered to a sample of approximately 2,600 registered apprentices, program records from grantees, and administrative earnings data from the National Directory of New Hires.