Knight’s $440 Million Loss Spurs Questions on Trade Cancel Rules

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Knight Capital Group Inc.’s $440 million loss from a computer malfunction this month highlights the dangers of limiting human input in decisions about canceling trades, according to two industry executives.

Regulators should have discretion to reverse transactions when the outcome puts a firm’s survival at risk, said Neal Wolkoff, former chairman and chief executive officer of the American Stock Exchange and ex-head of ELX Futures LP. They should allow “do-overs” in extreme cases, said R. Cromwell Coulson, CEO of OTC Markets Group Inc. in New York.