[CME Data Center Outage Caused by Operational Error, Leading to Over 10 Hours of Trading Disruption] On December 7, multiple markets under the Chicago Mercantile Exchange (CME) experienced trading disruptions for over 10 hours due to a data center outage. Data center operator CyrusOne confirmed that the outage was caused by human operational error. Staff and contractors at the Aurora, Illinois data center failed to follow standard procedures to drain the cooling towers before freezing weather, resulting in the cooling system freezing, overpressure operation, and uncontrolled equipment temperatures. CME noted that initial remedial measures exacerbated the issue, ultimately causing multiple cooling units to fail. CME acknowledged the severe impact of the incident on its global clients.