SPDR S&P 500 (SPY)

[imiloa]

that's good info. did you compile this yourself?
or copying from a link?

for ref, here are some other handy links:

SPY open interest totals (call vs put):
http://www.cboe.com/data/mktstat3.aspx?Dy=29&Mo=1&Yr=2016&selid=SPY

SPY open interest by price level:
http://maximum-pain.com/options/open-interest?s=SPY&urk=SPY


Unusual Option Activity:
http://online.wsj.com/mdc/public/page/2_3027-unusualoptmid.html

re: UOA, note that the data lists UOA for both calls and puts
(there's a "put" link in the table header)
so the key is checking the balance btwn them.

eg: for VIX, friday's option volume was:
calls: 90,112
puts: 33,099

so 3x calls on the day.