Harvard Business School reported a slight dip in the number of underrepresented minority students in this year's cohort.Brooks Kraft LLC/Corbis via Getty ImagesFive top US business schools enrolled less racially diverse classes this year compared to last year.Bloomberg analyzed demographic data in the year since the Supreme Court overturned affirmative action.Overall, however, the share of underrepresented minorities in top MBA programs increased this year.Five of the most prestigious business schools in the US enrolled fewer underrepresented minority students this year, according to demographic data released since the Supreme Court overturned affirmative action last summer.Minority enrollment at these five universities — all of which are among the top 10 MBA programs, per Bloomberg's Businessweek ranking — stands in contrast to a larger trend that saw an overall increase in the number of minority students attending highly ranked business schools this year.Bloomberg analyzed university disclosures of student racial counts and found that the share of Black, Hispanic, Native American, and Pacific Islander students enrolled in top MBA programs for the Class of 2026 actually represents an increase over the previous two years.The analysis comes more than a year after the Supreme Court voted to ban universities from considering race in admissions, effectively ending affirmative action.