… it would seem that when VIX's 20-day cumulative put volume falls below 400,000 contracts, the S&P tends to experience some weakness….
Upon further inspection, these troughs in VIX put volume have, in fact, served as precursors to VIX spikes, as well as some corresponding S&P weakness….
…And while we wouldn't recommend unloading all of your shares and heading for the bunkers on the basis of what amounts to a relative handful of data points, those who prefer to play it safe might wish to avail themselves of some portfolio protection…
http://www.schaeffersresearch.com/conte ... lity-spike