Penn is unsurprisingly the biggest alumni network within the biggest banks' investment banking programs, according to data from Revel io Labs. Different banks have some variations though — Wells Fargo has hired from public schools more than its counterparts, while regional preferences, like JPMorgan's for Baruch College, exist. Prestigious schools like Harvard and Stanford have slipped down the rankings over the last decade, data reveal, with one industry watcher speculating that tech has pulled some possible bankers away from the field. Visit Business Insider's homepage for more stories.