For the sentence of what is behind the rise on wall street? , what is the meaning of the rise on ? ?

Rise on is a phrasal verb that is used to talk about an increment in something. The question talks about wall street so to put it in other words What is behing the rise on wall street? can be said like What reasons are the cause of the increment or develope of wall street?

Rise on = Increment in value. Behind = Cause of