AT&T will dual list on the NYSE Texas, the U.S. wireless carrier said on Thursday, marking the latest company to be drawn to the Lone Star state's pro-business policies, lower taxes and strong economy. The dual listing of the Dallas-headquartered company, which has nearly 24,000 employees based in Texas, will be effective Friday, August 1. The state is also home to the largest number of companies listed on the NYSE. AT&T will maintain its primary listing on the New York Stock Exchange and trade