Today, Tuesday, May 19th is the last trading day for May in the following: VIX, RVX, VXN, GVZ, OVX, VXEEM, VXEWZ, and VXTYN futures* and options.
These contracts settle tomorrow, Wednesday morning, May 20th.
PLEASE NOTE: VIX options with an expiration date of May 20th, 2015 will cease trading at 3:15 p.m. CDT today, Tuesday, May 19, 2015. These expiring options will NOT trade during the ETH session on Wednesday, May 20, 2015.
* This is in contrast to VIX futures with[...]