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Frontier Oil Corporation was an independent energy company engaged in crude oil refining and the wholesale marketing of refined petroleum products in the United States, primarily in the Rocky Mountain and Mid-Continent regions. Its main assets included refineries in Cheyenne, Wyoming, and El Dorado, Kansas. Frontier Oil had roots dating back to 1949, with the company known as Frontier Oil Corporation being formed in 1999 (formerly Wainoco Oil Corporation). It was a publicly traded company on the New York Stock Exchange (NYSE: FTO) until it merged with Holly Corporation in July 2011 to form HollyFrontier Corporation, which subsequently rebranded as HF Sinclair Corporation in 2022.
Served as the corporate headquarters, housing executive leadership, strategic planning, financial operations, investor relations, and administrative functions for the company's refining and marketing business.
A modern office space typical for a corporation of its size in the energy sector, facilitating its nationwide operations management.
Likely fostered a results-oriented culture focused on operational efficiency, safety in its refining operations, and responsiveness to commodity market dynamics, common in the oil and gas industry.
The headquarters was the central decision-making hub for Frontier Oil's investments, operational strategies, and corporate governance until its merger with Holly Corporation.
Frontier Oil Corporation's operations were concentrated within the United States. Its primary activities involved refining crude oil and marketing petroleum products in the Rocky Mountain states (e.g., Colorado, Wyoming, Utah) and the Mid-Continent region (e.g., Kansas, Oklahoma, Missouri). The company did not have significant international upstream or downstream operations under the Frontier Oil brand, focusing its resources on its domestic refining assets and wholesale marketing network.
10000 Memorial Drive, Suite 600
Houston
Texas
USA
Address: 300 W. Lincolnway, Cheyenne, WY 82001 (approximate address for refinery area)
Supplied refined petroleum products to Wyoming, Colorado, and surrounding states, playing a key role in the regional energy infrastructure.
Address: 1401 S. Douglas Rd, El Dorado, KS 67042 (approximate address for refinery area)
Served markets in Kansas, Oklahoma, and other central US states, contributing to the refined product supply chain in the region.
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As of April 2025, Frontier Oil' leadership includes:
Frontier Oil has been backed by several prominent investors over the years, including:
Executive activity and news for Frontier Oil Corporation in its final year of independent operation (roughly July 2010 - July 2011) were predominantly centered around its merger with Holly Corporation. The existing leadership team remained largely stable to navigate this significant corporate transition, which led to the formation of HollyFrontier Corporation.
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Frontier Oil Corporation was acquired in 2011, and its corporate email domain (e.g., frontieroil.com) is no longer active. Historical email formats for companies of that era commonly used patterns like first initial and last name, or first name dot last name.
Speculative historical formats: [first_initial][last]@frontieroil.com or [first].[last]@frontieroil.com
Format
jdoe@frontieroil.com (example, domain inactive)
Example
0%
Success rate
Reuters • February 21, 2011
Holly Corp and Frontier Oil Corp agreed to merge in an all-stock deal valued at about $7 billion including debt, creating a major independent U.S. refiner. The combined company would be named HollyFrontier Corp....more
SEC Filing / Company Press Release • July 1, 2011
Holly Corporation (NYSE: HOC) and Frontier Oil Corporation (NYSE: FTO) today announced the successful completion of their merger of equals. The combined company is named HollyFrontier Corporation and began trading on the New York Stock Exchange under the ticker symbol HFC on July 1, 2011....more
PR Newswire / Frontier Oil Press Release (via SEC Filing) • May 5, 2011
Frontier Oil Corporation reported its financial results for the first quarter ended March 31, 2011, showing net income and discussing refinery throughputs ahead of its planned merger with Holly Corporation....more
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