One you cant miss is Rouge Trader. A very good movie about the rouge trader that caused the default of Barings Bank.
A few other I have watched in the last years that I found interesting:
Wall Street 2 (although far from the first one, it's still is pretty good)
To Big to Fail
Margin Call
One of my favorites, that I don't see many people talking about in Wall Street themed movies, is American Psycho.