Harvard Business School slides to its lowest rank ever in U.S. News, falling three places to sixth behind Stanford, Wharton, Kellogg, Booth, and MIT Sloan. By U.S. News' reckoning at least, HBS is not longer the best MBA program in Beantown. U.S. News officially calls this a 2021 ranking to extend the shelf life of the list but it comes out in 2020 and is based on 2019 data.