Citi shares have recently accounted for about 6 percent of composite volume.

They are twenty in number, four being novels, one a composite volume of tales, and the rest stories.

Trading in the Detroit automaker's shares accounted for nearly 8 percent of composite volume, according to Thomson Reuters data.

Trade was so heavy that Bank of America shares made up nearly 13 percent of the composite volume for the entire stock market.

Composite volume was the weakest for any week so far this year.