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US exchanges to create kill switches following Nasdaq outage

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A trading outage at Nasdaq last month heightened SEC’concerns about the stability of exchanges. Photo: Reuters

US stock exchanges agreed with regulators on Thursday to reforms including a “kill switch” to stop trading during emergencies, after a software glitch with Nasdaq’s stock quote processor last month led to a three-hour trading halt.

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Securities and Exchange Commission Chair Mary Jo White met privately in Washington with top executives of the major exchanges and later announced five reforms in response to recent trading problems.

The exchanges will be required to draft action plans to establish testing and disclosure protocols about systems changes for their securities information processors, or SIPs, which disseminate stock quotes and other data.

They also are required to provide a plan to address how regulatory halts are communicated, assess their other critical infrastructure systems and review their current rules for busting trades and re-opening trading after a halt.

“Today’s meeting was very constructive,” White said in a statement after the meeting concluded.

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“I stressed the need for all market participants to work collabouratively - together and with the Commission - to strengthen critical market infrastructure and improve its resilience when technology falls short.”

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