Interesting, 1/2 hr in, 8/7/17

Not a typical day where calls outnumber puts by a wide margin.  Now 3 1/2 hrs in:   1801 calls and 2619 puts.  47% of calls and 9% of puts traded at or above ask.  But put volume running many times normal put volume.  It is that Monday after expiration that seems to generate more option volume, though I would believe that the option expiration day would generate the higher volume.  I'm simply wrong on this.

It is very likely that 2000 of the put volume is a rollover of the Sep $7 puts for the Jan 2019 $7 puts, which each have traded about 1000.