From the CME Globex Control Center, here is the summary of KEY changes per CME market segment
Monday, September 4, 2023 - Market "HALT" > then reopens Monday night at normal times.
**Any open positions must meet Exchange Maintenance Margin 15 minutes before the market halt (11:45 am CST).
https://www.ampfutures.com/trading-info/margins/
View Full List: https://www.ampfutures.com/trading-info/holiday-hours/
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