not4weak

670B options?

not4weak

There are five flavors of SPX options:
The standard AM settled options that expire on the morning of the third Friday of the  month (SPX).  These are floor traded and usually have wide spreads bid/ask spreads.  Their expiration value is published under the ticker SET  (^SET for Yahoo Finance).
Four PM settled flavors: the Weeklies (SPXW), the End of Month (SPXW), the Quarterlys (SPXW), and the PM version of the SPX (SPXPM)  that settles Friday afternoon.   The first three show up under the SPX symbol in option chains, the SPXPM options show up in their own chain.   The Quarterlies will trump the Weeklys, The End of Month, if they all fall in the same week.   The PM expiring options use the standard S&P 500 Friday close SPX (^GSPC for Yahoo Finance) as their expiration value.