According to the Academic influence research, here is

The 10 Colleges and Universities With The Most Alumni Who Are CEOs of Fortune 500 Companies

• Harvard University: 41
• University of Pennsylvania: 23
• Stanford University: 22
• Northwestern University: 20
• Columbia University: 18
• University of Chicago: 15
• University of Michigan: 12
• Cornell University: 10
• Dartmouth College: 10
• University of Virginia: 10