According to @KobeissiLetter, U.S. stock market futures were halted due to a cooling issue at a Chicago Mercantile Exchange data center (source: @KobeissiLetter on X, Nov 28, 2025). CME Group operates equity index futures and also lists Bitcoin (BTC) and Ether (ETH) futures, linking the incident to both traditional and crypto derivatives markets (source: CME Group official product pages). Traders should monitor official CME status updates and be prepared for liquidity shifts when trading resumes to manage execution risk across equity and crypto futures (source: @KobeissiLetter for the halt notice; CME Group for product scope).