Calpine Corporation is a Fortune 500 power company founded in 1984 with headquarters in Houston, Texas. The company’s stock was traded on the New York Stock Exchange under the symbol CPN until it was delisted on December 5, 2005 due to low share price. On 31 January 2008, Calpine emerged from bankruptcy... 

Formed in 1983 as Southwestern Bell Corporation, the companny AT&T Inc., is the largest provider of both local and long distance telephone services in the United States, and also serves digital subscriber line Internet access. It is claimed that the company has over 77 million wireless customers,...