Friday, April 29, 2016

options - call vs put open interest


I have been observing the data for US stock options.


In general, it seem like there are more open interest for call rather than for put, is there a reason people like to write more call?



at the same time, some stocks have rather sharp ratio of put to call open interest (5:1 or 1:5), why would these happen? would market maker be rather exposed?




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