it's probably feasible to get a job in finance with only an undergraduate degree from Stanford.

It is, but you'll get an undergrad kind of a job.

JPMorgan has 260,000 employees. The compensation expense in 2012 was about $30.5 billion which means the average total compensation (including bonuses, etc.) was about $117K per employee.

That's a nice salary but seems to be roughly similar to what doctors make.