Math/Finance

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What's the connection?

I was at a graduation recently where the commencement speaker announced future plans for each of the Math graduates as they received their diplomas. As I expected, many were headed to either a job or graduate study in Math, Computer Science, Engineering, Actuary, etc. But, surprisingly to me, a (significant) number of them were going on to finance and investment banking. I didn't think there was a connection. Sure, finance and investment banking have some math, but isn't that something a business major gets as part of their routine education, why do they even need a Math major?

What am I missing?