This supplement to "Completing College: A National View of Student Attainment Rates--Fall 2010 Cohort" (https://nscresearchcenter.org/signaturereport12) (2016), 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 data used in this supplement was limited to a sample of schools selected specifically for race and ethnicity analyses. [For the full report, "Completing College: A National View of Student Attainment Rates--Fall 2010 Cohort (Signature Report No. 12)," see ED580301. For another supplement to the full report, "Completing College: A State-Level View of Student Attainment Rates (Signature Report No. 12a)," see ED580303.]