I have 3 industries running neck and neck for the lead today, marketing services, non metallic mining, and agricultural chemicals. At the time I had to retrieve the charts, marketing services was in the lead, so I will go with that. Marketing services is an 18 stock group, the largest of which is CCO, which is also the biggest gainer today (the top four gainers are in the chart above).
These are the 18 stocks ranked by market cap. CCO's big move today is the reason for this group's lead.