In this week's Fortune 500 issue, it has a short post on the leading alma mater of Fortune 500 CEOs. My alma mater, University of Wisconsin, is tied with Harvard University for having 11 CEO alums on the Fortune 500 list. Go Badgers!
Admittedly, it's quantity vs. quality. Wisconsin's sheer numbers plus excellence versus Harvard's higher excellence on average :)
UPDATE: I answered a related question over at Peerpong, which I've copied below...
Which MBA programs are known for producing Operations all stars?
Harvard Business School (HBS) is one of them. In terms of producing marketing executives, Northwestern's Kellogg is considered the leader.
Additional data that I'm aware of is that for undergraduate programs, Harvard and Wisconsin have the most Fortune 500 CEOs in the current list. And I remember an older study from the 90s that showed for companies, McKinsey and GE alumni made up the highest number of Fortune 500 CEOs.