This report provides six-year completion rates, including degree and certificate completion, disaggregated by race and ethnicity for students who began postsecondary education in fall 2010. The fall 2010 cohort was also the focus of the Signature Report 12, the national report on college completions (https://nscresearchcenter.org/signaturereport12), released in December 2016, and the state level report (https://nscresearchcenter.org/signaturereport12-statesupplement), released in March 2017. Unlike those reports, which relied on full populations from the National Student Clearinghouse data, the data used in this supplement was limited to a sample of schools selected specifically for race and ethnicity analyses.