(AP Photo/Richard Drew) U.S. trading firms and investors have been hit by a series of market disruptions, including the runaway trading in August by Knight Capital that cost it $440 million in just hours.

Abroad, curbs on high-speed trading take hold

Reforms » Countries move to halt abuses, although U.S. has been slow to act.

By NATHANIEL POPPER

| The New York Times

First Published Sep 26 2012 06:14 pm • Last Updated Sep 26 2012 06:14 pm

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