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1947

Holly Corporation was originally incorporated under the name General Appliance Corporation.

1949

Frontier Oil Corporation was originally incorporated under the name Wainoco Oil Corporation, which was primarily an oil and gas exploration company with production in Canada and the U.S.

1952

General Appliance Corporation changed its name to Holly Corporation to broaden its interests into oil production.

1955

Holly Corporation was listed on the American Stock Exchange (AMEX) and focused on the oil and gas exploration industry while income was mainly from real estate sales and interest.

1969

Holly purchased Navajo Refining Company in Artesia, NM from Continental Oil Company.

1972

Holly moved its home office to Dallas, TX from Azusa, CA.

1977

The Navajo Refinery eclipsed real estate as the major source of revenue for the company.

1981

Wainoco listed on the New York Stock Exchange (NYSE: WOL).

1982

Holly was included in the Fortune 500 list of largest U.S. industrial corporations.

1991

Wainoco purchased Frontier Oil Corporation, whose primary asset was a crude oil refinery located in Cheyenne, WY.

1992

Wainoco had three operating units: U.S. Oil and Gas, Canadian Oil and Gas, and Frontier Oil.

1995

Wainoco sold U.S. operations in exploration and production due to lack of scale.

1997

Wainoco sold Canadian assets to pay down corporate debt and concentrated entirely on refining operations.

1998

Wainoco changed its name to Frontier Oil Corporation (NYSE: FTO) to reflect the change in corporate strategy.

1999

Frontier purchased the El Dorado, KS refinery from the Shell-Texaco joint venture, Equilon, quadrupling the company’s refining capacity.

2003

Holly purchased the Woods Cross, UT refinery from ConocoPhillips.

2004

Holly Energy Partners was formed and listed on the New York Stock Exchange (NYSE: HEP). Holly changed its listing from the AMEX to the New York Stock Exchange (NYSE: HOC).

2005

Holly was named as a “Best Managed Company” by Fortune magazine.

2007

Frontier was ranked in the top ten for “Total Return to Shareholders” and “Revenues per Employee” by Fortune magazine.

2009

Holly acquired the Sunoco and Sinclair refineries in Tulsa, OK, doubling the company’s refining capacity and number of employees.

2011

Holly and Frontier completed a merger of equals and changed name to HollyFrontier Corporation (NYSE: HFC).

2013

HollyFrontier listed as one of the 150 largest companies in the U.S. by Fortune magazine.

2017

HollyFrontier Corporation acquired Petro-Canada Lubricants Inc. which combined with HFC’s Tulsa Lubricants production makes HFC the fourth largest specialty lubricants producer in North America.

2018

HollyFrontier acquired Red Giant Oil Company.

2019

HollyFrontier acquired Sonneborn.
HollyFrontier announced plans to produce renewable diesel.

2021

HollyFrontier acquired Puget Sound Refinery,
located in Anacortes, WA.

2022

HollyFrontier and Holly Energy Partners Announce Completion of Transactions with The Sinclair Companies and Establishment of New Parent Company, HF Sinclair Corporation

2023

HF Sinclair Corporation Completes Acquisition of Holly Energy Partners, L.P.