Effective on trade date July 31, 2023, and pending all relevant CFTC regulatory review periods, this Market Regulation Advisory Notice will supersede CME Group Market Regulation Advisory Notice RA2301-5 from June 1, 2023. It is being issued in connection with the adoption of CME and CBOT Rule.524.D. (“Trade Marker at Close (‘TMAC’) Transactions”). The new TMAC transaction type will allow market participants to trade certain equity index futures contracts at the current day’s applicable marker price, or at any valid price increment up to four ticks higher or lower than the marker. (See SER-9219)
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