VIX options are settled 30 days pior to normal expiration. pricing is based on the SPX options opening price. This may allow for some large institutions to try and fire through some manipulating orders on that Wednesday morning in the SPX.
The price of the VXN is based on... 8 option contracts... 4 front month and 4 back months all surrrounding the strike (ATM).
The VIX now uses some weighted average of all the front-month vols.
Reverse skew will inflate the VIX OTM call options when the VIX is low. Since the VIX will spike with a sharp correction in SPX.

The price of the VXN is based on... 8 option contracts... 4 front month and 4 back months all surrrounding the strike (ATM).
The VIX now uses some weighted average of all the front-month vols.
Reverse skew will inflate the VIX OTM call options when the VIX is low. Since the VIX will spike with a sharp correction in SPX.
