Noteworthy Friday Option Activity: ADT, AMZN, ISRG

Among the underlying components of the S&P 500 index, we saw noteworthy options trading volume today in ADT Corp (ADT), where a total of 64,166 contracts have traded so far, representing approximately 6.4 million underlying shares. That amounts to about 252.4% of ADT's average daily trading volume over the past month of 2.5 million shares..