Lots of industries and companies need to build models of complex systems: business analysts, stock traders, insurance actuaries, sports teams, engineering firms. Other people can also build such models, but mathematicians are the specialists at this. The tech giants employ lots of mathematicians to analyse human behaviour (you may have heard of big data).
Then there are the complex systems that companies themselves need. The software that banks use to keep track of and move money around are naturally incredibly complex. Again a mathematician would have useful skills here.
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