All the cities that I can remember that have stock exchanges with global spotlight and the ability to influence markets are on this list: Nikkei, BSE, NYSE, LSE, SSE, Euronext, HKEX, NYSE Chicago, SGX, DAX, TMX...
There is certainly a direct relation between the two, when one considers that these large exchanges attract financial companies from the rest of the world to have branches nearby.
Perhaps the exception to this rule is Milan, which according to this
source, has 16,000 financial companies, which would be enough to put the city on the list. Perhaps it all comes down to the criteria for defining what is considered an employee in the financial sector.