As they say - Science is a way to quench one's personal interests for someone else's money. I guess it depends what's your interest in math is. If it is statis

As they say - Science is a way to quench one's personal interests for someone else's money. I guess it depends what's your interest in math is. If it is statistics and probability theory, then HFT startups or any finance-related companies would be the best bet. If math modeling it is, then some sort of geo-surveying/environmental companies would be the ones, or perhaps a meteorology setups. Most of these will be run by the government, so the pay won't be great. All in all, a pure mathematician is rarely needed in a commercial environment if ever. Applied math is what you are realistically looking at, but then it all depends.