Among the underlying components of the S&P 500 index, we saw noteworthy options trading volume today in Cigna Corp (NYSE: CI), where a total of 9,514 contracts have traded so far, representing approximately 951,400 underlying shares. That amounts to about 53.7% of CI's average daily trading volume over the past month of 1.8 million shares. Particularly high volume was seen for the $135 strike put option expiring January 20, 2017, with 5,001 contracts trading so far today, representing approximately 500,100 underlying shares of CI. Below is a chart showing CI's trailing twelve month trading history, with the $135 strike highlighted in orange:
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