8. Verizon ( VZ) owns 55% of Verizon Wireless, the largest mobile-telecom network in the U.S. In the past 12 months, Verizon's sales have declined 0.9%, but net income and earnings per share have ascended just over 2%. Verizon's fourth-quarter net margin came in at 10%. The company suffered a loss in the year-earlier quarter. The company posted 2010 sales of $107 billion and pre-tax income of nearly $13 billion. Verizon received a $709 million current tax benefit from the U.S., but deferred $2.9 billion for future taxes. It enjoyed a $19 million current international tax benefit and a $24 million deferred tax benefit. On the local level, Verizon received a $42 million current tax benefit. Verizon had an effective 2010 tax rate of 19%, up from 14% in 2009.