NYSE glitch traced back to employee who left backup system running, report says

• An NYSE glitch was caused by a staffer in the exchange's Chicago data center, per Bloomberg.
• The employee failed to properly shut down the disaster-recovery system, sources said.
• The glitch affected more than 250 companies and caused double-digit swings for some share prices.

A glitch on the New York Stock Exchange (NYSE) that led to dramatic price swings for more than 250 firms has been traced back to a staffer who left a backup system running, a report says.