Conversion of SPXPM options to Symbol SPXW
CBOE is planning a change to the symbol for existing SPXPM option series to option symbol SPXW in both the Regular Trading Hours (RTH) and Extended Trading Hours (ETH) session. The change is scheduled to be effective May 1, 2017, pending regulatory approval.
IMPORTANT: After the conversion, on standard expiration dates (i.e., generally the third Friday of the month), both AM-settled options trading under symbol SPX and PM-settled options trading under symbol SPXW, both of which have the same underlying SPX index, will expire and be settled. The settlement symbol for the AM-settled SPX options will be “SET”; settlement for the PM-settled SPXW options is based on the official SPX closing price on the expiration date.
For more details, see CBOE Regulatory Circular RG17-002.