The story
The company, originally called Alabama Gas Corporation, was spun off from Southern Natural Gas (later, Sonat Inc.) in 1953 as part of an antitrust agreement.
In 1985, the company was renamed Energen Corporation. Its subsidiaries included its natural gas utility division, Alagasco (Alabama Gas Corporation), which was sold in 2014, and its oil and gas exploration division, Taurus Exploration (later Energen Resources).
In 2002, Energen Resources acquired properties in the Permian Basin for $120 million in cash and $70 million in stock.
In 2003, Energen Resources acquired 93 billion cubic feet of gas equivalent of proved reserves in the San Juan Basin of New Mexico and southern Colorado for $39 million.
In 2004, Energen Resources acquired San Juan Basin coalbed methane properties from a private company for $273 million.
In 2009, the company acquired assets in the Permian Basin from Range Resources for $182 million.
In 2014, the company sold its natural gas utility business, Alabama Gas Corporation (Alagasco), to Laclede Group for $1.35 billion in cash and the assumption of $250 million in debt.
In 2015, the company sold the majority of its assets in the San Juan Basin for $395 million.
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In 2018, the company was acquired by Diamondback Energy.
From Wikipedia’s article on Energen, shared under CC BY-SA 4.0.6