Amendments to CME and CBOT Rule 524. and Certain CME and CBOT Equity Index Futures Contracts Regarding Basis at Trade Index Close ("BTIC") Transactions, Price Assignment and Disruption Event Procedures

Effective Sunday, August 8, 2021 for trade date Monday, August 9, 2021, and pending all relevant Commodity Futures Trading Commission (“CFTC”) regulatory review periods, Chicago Mercantile Exchange Inc. and The Board of Trade of the City of Chicago, Inc. (collectively, the “Exchanges”) will amend CME and CBOT Rule 524. (“Trading at Settlement (“TAS”), Basis Trade at Index Close (“BTIC”) and Basis Trade at Cash Open (“TACO”) Transactions”) and certain CME and CBOT equity index futures contracts in Table 1. below regarding BTIC transactions, price assignment and disruptive trading procedures (collectively, the “Rule Amendments”).

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