Aggressive pricing helped Cummings surpass rival alternative trading sites, like Knight Trading's Direct Edge, in short shrift.

FORBES: Intelligent Investing Briefing Book

The NYSE says it needs more time to connect its systems to those of potential rivals, including the International Securities Exchange and Knight Trading's Direct Edge.

FORBES: Magazine Article

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