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U.S. Securities and Exchange Commission

Regulators move on high-speed traders

Regulators are proposing new procedures to monitor high-speed trading more closely in response to wild market swings brought on by a series of technical breakdowns.

More than 70 percent of all trading today is automated, the Commodity Futures Trading Commission said Tuesday as it voted unanimously in favor of new registration standards for high-speed traders.

The systems use algorithms to spot variances in market data, allowing trading firms to deliver buy and sell orders in milliseconds.

That technology has led to a number of high-profile glitches, including one this summer that shut down the New York Stock Exchange for almost half a day.

The CFTC proposals...