Core Insights - A significant data center outage at Cyrus One in Illinois caused a halt in futures and options trading for over 10 hours, marking one of the longest outages in years for CME Group [1][10] - Trading resumed mid-morning on Friday, but the outage occurred during a holiday-shortened session, leading to lighter trading volumes and brokers operating without live prices [2][3] Company Overview - CME Group, based in Chicago, is the largest exchange operator by market value, processing $1.5 trillion in equity index futures and options daily, along with $9.6 trillion in notional value for interest-rate bets [9] - The company has a historical background, originally founded as the Chicago Butter and Egg Board in 1898, and operates major exchanges including the New York Mercantile Exchange and the Chicago Board of Trade [11] Technical Issues - The outage raised concerns about the reliability of trading platforms, as traders were unable to close positions, potentially leading to significant costs [4] - This incident is one of the worst outages for CME in recent years, with previous outages occurring in 2014 and 2019 due to technical problems [10] Market Impact - The timing of the outage during a holiday period reduced its immediate impact, but experts warned that thin trading volumes could lead to larger price movements [8] - Average daily derivatives volume for CME was reported at 26.3 million contracts in October, indicating a substantial trading activity prior to the outage [10]