The older post Economics for Investment Banking? - #6 by triplectz suggests that business and math-heavy majors are favored by IB recruiting at UCB.
Perhaps this may be because business has a competitive secondary admission process, and the math-heavy majors are seen as “hard”.
Note that the linked post also mentions a 3.7+ college GPA, but it is extremely competitive beyond major and GPA (3 out of 150 applicants getting summer internships).