Like a lot of the other guerrilla marketmakers, Citron and Levine got their start through Nasdaq's Small Order Execution System, or SOES. This allows orders of 1, 000 shares or fewer to be executed automatically at marketmakers' quots.

FORBES: Guerrillas on Wall Street

Like a lot of the other guerrilla marketmakers, Citron and Levine got their start through Nasdaq's Small Order Execution System, or SOES. An early response to critics of Nasdaq's voluntary dealer market, SOES allowed orders of 1, 000 shares or fewer to be executed automatically at marketmakers' advertised quotes.

FORBES: Free enterprise comes to Wall Street