Among the underlying components of the S&P 500 index, we saw noteworthy options trading volume today in Kansas City Southern (NYSE: KSU), where a total of 8,389 contracts have traded so far, representing approximately 838,900 underlying shares. That amounts to about 64.1% of KSU’s average daily trading volume over the past month of 1.3 million shares. Particularly high volume was seen for the $85 strike put option expiring July 15, 2016, with 4,011 contracts trading so far today, representing approximately 401,100 underlying shares of KSU.