Bart Chilton, a member of the Commodity Futures Trading Commission, says high-frequency trading firms should be required to register with regulators in order to help officials decide whether they should face new rules. "It's a gaping hole in our regulatory oversight," Chilton said. "Some HFTs are unregulated. We should compel registration. Then we can determine what they might need to be required to do to ensure markets are efficient and effective."

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