Looking at options trading activity among components of the S&P 500 index, there is noteworthy activity today in Diamond Offshore Drilling, Inc. (NYSE: DO), where a total volume of 22,269 contracts has been traded thus far today, a contract volume which is representative of approximately 2.2 million underlying shares (given that every 1 contract represents 100 underlying shares). That number works out to 106.6% of DO's average daily trading volume over the past month, of 2.1 million shares. Particularly high volume was seen for the $20 strike put option expiring June 17, 2016, with 3,569 contracts trading so far today, representing approximately 356,900 underlying shares of DO. Below is a chart showing DO's trailing twelve month trading history, with the $20 strike highlighted in orange:
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