Starting Sunday, September 14 (trade date Monday, September 15), to optimize options trading and make instrument management easier, CME Globex will implement a new User-Defined Spread (UDS) lifecycle for options on Equity Index futures – Daily with Extension.

UDS Combos on eligible products will be created with the last trade datetime (LTD) equal to the market close on the day of creation; and they will be eligible for LTD extensions based on Good Till Cancel (GTC) and Good Till Date (GTD) orders.

This change will be available in the New Release environment for customer testing this Sunday, August 3.