WASHINGTON, D.C. -- On the one-year anniversary of the Flash Crash, Securities and Exchange Commission chairman Mary L. Schapiro said the behavior of high-frequency trading firms will be closely scrutinized -- and placing obligations on high-speed traders to maintain markets in stocks "remains on the table.''

The disappearance of high-frequency traders at critical moments of the Flash Crash means that regulators must "thoroughly examine their role" in exacerbating the plunge instead of correcting it, Schapiro said to attendees of the General Membership Meeting of the Investment Company Institute.

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