I know that Citibank's foreign exchange market making desk was using Mathematica, at least they were 15 years ago. It's unusual in the quant world though. I t

I know that Citibank's foreign exchange market making desk was using Mathematica, at least they were 15 years ago. It's unusual in the quant world though. I think they had hired a bunch of PhDs who had spent too much time in academia.