While panelists on today’s SEC technology roundtable argued about whether high frequency trading adds or takes liquidity, Larry Tabb, CEO of TABB Group, is demanding more tangible measures by calling for a reduction in the number of computerized trading systems.

The panel was called to help the SEC address problems with high frequency trading, and Jamil Nazarali, head of execution services at Citadel Securities, a subsidiary of the Chicago financial firm headed by Ken Griffin, surprised the audience with his denial that high frequency traders, who use sophisticated computer systems to execute stock trades in milliseconds, are primarily engaged in exploiting small price differences in equities. He complained that that most press coverage of high frequency trading treats the practice as predatory or abusive.

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