stock·job·ber /ˈstɑkˌʤɑbɚ/
  股票投機商人,股票經紀人,證券公司
  Stock·job·ber n.  One who speculates in stocks for gain; one whose occupation is to buy and sell stocks. In England a jobber acts as an intermediary between brokers.
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  stockjobber
       n : one who deals only with brokers or other jobbers