August 28, 2017
Open interest records: VIX futures hit a new record for open interest with more than 673,000 contracts on August 7, and VIX options reached a new record for open interest with 14,783,380 contracts open on Aug. 15. Volume records: Aug.10 was an all-time record volume day for both VIX futures (volume of 942,109 contacts) and for VIX options (volume of 2,538,121 contracts).