Sonat, Inc., was a large Fortune 500 American energy holding company headquartered in Birmingham, Alabama.

The company was founded in 1928 and was listed on the New York Stock Exchange under the ticker symbol "SNT".

Sonat was founded in Birmingham, Alabama, as Southern Natural Gas Corporation in 1928 by Christopher Chenery.

On March 27, 1986, the company expanded its pipeline division by acquiring 50% of Citrus Corporation, which owned Florida Gas Transmission, for $360 million in cash.

By the end of the 1980s, the company was a leader in natural gas pipeline distribution, exploration and production, and offshore drilling.

In June 1995, the company sold its remaining stake in Sonat Offshore division to stockholders.

[3] On November 23, 1997, Sonat expanded its Exploration and Production division by acquiring Zilkha Energy for $1.3 billion.

Sonat Inc.'s corporate headquarters and several of its divisions were located in the AmSouth-Sonat Tower in Birmingham, Alabama.

Sonat sold Sea Robin Pipeline in 1999 as a requirement to complete its merger with El Paso.

After being acquired by El Paso in 1999, Southern Natural Gas continued to operate as a separate division and kept its corporate headquarters in the AmSouth-Sonat Tower until 2007, when it relocated to the Colonial Brookwood Center located in a suburb of Birmingham.

[9] Southern Forest Products was formed in 1968 and consisted of the company's more than 800,000 acres of timberland and natural resource holdings in the southeast.