One of the biggest surprises in the new data released with the ranking is the increase in the acceptance rate at Stanford last year. The school admitted 8.9% of its applicant pool, up from 6.9% a year before. Harvard Business School, meantime, became more selective, accepting just 9.2% of its candidates, down from 11.5% a year earlier. The three-month employment rate for Harvard MBAs, however, fell to 82.5% from 89% in 2019.