In response to several requests from CME Group customers, beginning Sunday, May 4 (trade date Monday, May 5), the market data book depth for all U.S. Treasury, Swap and Fed Fund options on futures sent via the MDP -- channel 116 -- will change to three deep . Currently, these markets only support top-of-book market depth. This change will impact both the FIX/FAST and RLC-format market data books. The complete list of impacted products is available in the attached table. This change will be available for customer testing in the New Release environment on Monday, April 14.