The chart above, and the stock's historical volatility, can be a helpful guide in combination with fundamental analysis to judge whether selling the January 2016 put or call options highlighted in this article deliver a rate of return that represents good reward for the risks. We calculate the trailing twelve month volatility for Caterpillar Inc. (considering the last 251 trading day CAT historical stock prices using closing values, as well as today's price of $98.15) to be 19%. In mid-afternoon trading on Monday, the put volume among S&P 500 components was 930,422 contracts, with call volume at 1.74M, for a put:call ratio of 0.53 so far for the day. Compared to the long-term median put:call ratio of .65, that represents very high call volume relative to puts; in other words, buyers are preferring calls in options trading so far today. Find out which 15 call and put options traders are talking about today.