This group includes establishments engaged in the underwriting, purchase, sale or brokerage of securities and other financial contracts on their own account or for the account of others; exchanges, exchange clearinghouses and other services allied with the exchange of securities and commodities:

    621.  Security brokers, dealers and flotation companies;

    622.  Commodity contracts brokers and dealers;

    623.  Security and commodity exchanges;

    628.  Services allied with the exchange of securities or commodities. (Prior code § 11-20-065)