Can someone shed some lights?

Hi, I'm a current MBA student in USA and I will graduate next year. I'm very into Finance, and I would like to pursue a PhD degree in the future. Can someone provide me a short list of Math courses that I should have taken before applying? I know Calculus I, II, and III are must, and I already took them in undergrad. What else I need? I'm looking to take Math courses to beef up my background before applying.

Thanks in advance.