The CME Group proposed a common single rule for block trades for all its four exchanges. The current rules differ slightly among the exchanges by providing different times for block trade reporting. The new single rule says that block trades must be reported “within the time period and in the manner specified by the Exchange.” In addition, CME Group proposes to have a single interpretive guidance regarding block trades for all four of its exchanges, instead of one for the Commodity Exchange, Inc. and New York Mercantile Exchange, and a separate one for the Chicago Mercantile Exchange and the Chicago Board of Trade. The new guidance will highlight in a single document differences among the CME Group exchanges regarding block trade minimum quantities, reporting requirements and price reporting methods. The new rule and guidance are proposed to be effective May 29, 2015.