MasTec Inc. (NYSE: MTZ) shares gained 12.8% to $18.02, on share volume of 1.2 million, or double its all-day average, a day after the utility contractor projected full-year earnings that topped market forecasts.

Citigroup Inc. (NYSE: C) dealt in 135 million shares early Thursday, pursuing an all-day average of 551 million. Prices for C faded 0.7% to $4.66.

E-Trade Financial Corp. (Nasdaq: ETFC) shares shed 4.7% to $15.86. Volume was 10.7 million shares, or nearly four times its full-day average, after the online brokerage said its biggest shareholder and bondholder planned to cut its holdings in E-Trade to less than 20%.