- VIX SQ is based on the variance strip, i.e. a bunch of OTM options going pretty far which are then weighted by the inverse of the strike. The options there don't really need to trade for them to be counted.
- Since the strip is cut-off at the last "continuous" strike with a valid bid, you can manipulate the print by trading the puts. Showing a bid below that strike lifts the print or hitting the bid in full size reduces the print. It's gotten harder since the new HOSS process was introduces in 2015
- Why on earth would you trade weekly VIX options considering the staggering liquidity?
