NYSE Upgrade Gone Bad Caused Outage, Allaying Hacking Fears

Traders wait on a nearly empty trading floor at the New York Stock Exchange (NYSE) after trading was halted due to a 'technical glitch' on July 8, 2015 in New York City.

Photographer: Spencer Platt/Getty Images

The New York Stock Exchange said a botched technology upgrade, not a hacking attack as some feared, caused Wednesday’s outage that froze one of the world’s biggest equity markets.

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