The Collaborative International Dictionary of English v.0.48:

Stockjobbing \Stock"job`bing\, n.
   The act or art of dealing in stocks; the business of a
   stockjobber.
   [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

22 Moby Thesaurus words for "stockjobbing":
   agiotage, arbitrage, brokerage, buying in, equity capital, flier,
   flutter, jobbing, legal bucketing, liquidation, plunge,
   profit taking, round trade, scalping, speculation, spot sale,
   stockbrokerage, stockbroking, stockjobbery, turn, venture,
   venture capital