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Lion Oil Company was established in 1922. Thomas Harry (Colonel) Barton was instrumental in the development of the company.
In 1955, Lion Oil was sold to the Monsanto Company along with what is now El Dorado Chemical Company. Lion Oil is the only oil refinery Monsanto has owned. Lion Oil was later sold by Monsanto to Tosco.
In March 2011, Delek US Holdings of Brentwood, TN agreed to acquire Ergon’s 53.7% majority equity interest; total equity ownership by Delek increased to 88.3%; Delek US became the new operator of Lion Oil on April 29, 2011.
In October 2011, Delek US Holdings acquired the remaining 11.7% interest to increase its equity interest in Lion Oil to 100%.
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