QSB Box Spread

QSB Box Spreads are created each trading date using strike spacing of 1000 (i.e., $100,000 notional) on the first four serial, the first three quarterly, and the first three December standard SPX expirations. By convention, Buying a QSB Box Spread is buying the low strike Call, selling the high strike Call, selling the low strike Put, and buying the high strike Put. The QSB Box Spread Expirations figure below illustrates the QSB Box Spreads created each trading date.

The EDCID message EDCI Type value for QSB Box Spreads is "QSB" and the EDCI Subtype value is "BOX_SPREAD".