Regulators might require derivatives exchanges to introduce rules limiting risks related to high-frequency traders, Commodity Futures Trading Commission Chairman Gary Gensler is expected to tell lawmakers. The CFTC is working on principles for testing and oversight of electronic trading systems. The agency likely will seek feedback on how to develop a "supervision regime designed to ensure that electronic trading systems are tested and supervised by trained personnel and that appropriate risk controls are in place," according to Gensler's testimony.

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