8.91 million calls and 4.74 million puts traded through 13:30 eastern time, which is about 1.5X the typical volume. The put-to-call ratio has fallen to .53. Heavy trading in Citi is one reason. 1.78 million calls have traded on the bank, which is almost 20 percent of the day’s total call volume. Meanwhile, another 1.25 million calls have traded in Wal-mart (WMT), Occidental Pete (OXY), and Williams Companies (WMB) due to ex-div activity. Stripping out the ex-div names, the put to call ratio is .62, well below a 10-day average of .72.