The Chicago Mercantile Exchange, or CME, had to pause trading activities across the globe because of a cooling issue at one of the data centers that serve it. According to CNBC, CME is the largest derivatives exchange operator in the world, so this disruption has been felt in cities as far away as London and Kuala Lumpur. This exchange lets you trade almost everything on the market, including agriculture, energy, equity indices like S&P 500 and Nikkei 225, foreign exchange, interest rates, metals, crypto, and more.
Due to a cooling issue at CyrusOne data centers, our markets are currently halted. Support is working to resolve the issue in the near term and will advise clients of Pre-Open details as soon as they are available.November 28, 2025
At the time of writing, BrokerTec US Actives, which primarily electronically trades liquid U.S. Treasury securities, and BrokerTec EU, dealing in European government bonds and repo agreements, are now open. However, all the rest of the trading systems remain down.
The timing of the outage — happening early in the morning on the last day of the week, right after a holiday — meant that it would likely have a limited impact on U.S. trading. On the other hand, Asian and European markets are expected to feel the brunt of the interruption. A Kuala Lumpur-based trader told CNBC that prices haven’t moved much since the start of the issue, and that they expect that to continue until it has been resolved.
This isn’t the first time that the exchange has had to stop trading because of an issue with its electronic systems, but this has certainly been the biggest, so far. This also revealed the risks of relying on just a single system, especially for such a massive operation that moves trillions of dollars and whose actions can affect entire economies.
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