In regards to finance, I’ve heard both Williams’s math and econ depts. referred to as, “The West Point of Wall Street.” Recruitment at WC is vigorous.
In other depts., don’t forget the Williams Art Mafia (google it). Still alive and well, filling art history positions all over the country, with powerful museum directors and curators at some of the finest institutions around. Having attended an equally influential “mafia” program for a different industry at a another Little Three school, I know how important these kinds of connections can be, generation after generation. When my DS was considering classes beyond his STEM/econ interests, his advisor (chair of the physics dept.) said, “You’re at Williams. For goodness sake, take art history!” Our dubious DS did and loved it, changing his view on the fine arts in general. THIS is why a liberal arts education is so important.