In addition, with the growth of direct market access (DMA) and algorithmic trading, asset managers and hedge funds are using broker dealer infrastructure to trade on the market, and potentially create trading problems.

FORBES: Monitoring Traders Trade: Sell-Side, Buy-Side or Asset Managers

The SEC is proposing a ban on flash trading along with other issues grabbing headlines, like direct market access for high-frequency traders.

FORBES: Birth Of A Stock Exchange

But upstart electronic trading sites like BATS Trading and Knight Trading's direct edge, which have been gunning to take market share from Nasdaq and the NYSE, were also cranking.

FORBES: Crank Up The Volume