HOUSTON--(BUSINESS WIRE)--
June 28, 2011 — Frontier Oil Corporation (NYSE: FTO) ("Frontier") today
announced that, at a special meeting of Frontier shareholders held today
in Houston, Frontier shareholders voted to approve the merger agreement
with Holly Corporation (NYSE: HOC) ("Holly"), which provides for the
merger of Frontier into a subsidiary of Holly. The merger agreement was
approved by 99% of the total votes cast by Frontier shareholders at the
meeting. Upon consummation of the transaction, Holly will change its
name to HollyFrontier Corporation.
Mike Jennings, Frontier's Chairman, President and Chief Executive
Officer, said, "We are pleased that our shareholders overwhelmingly
supported our merger with Holly. This combination will deliver value for
the shareholders of both companies through an expanded asset footprint,
reduced costs, increased operational efficiencies and a strong balance
sheet. I want to thank our shareholders, customers and dedicated
employees for their support throughout this process and look forward to
moving forward as an even stronger combined entity."
HollyFrontier Corporation, which will have a refining capacity in excess
of 440,000 barrels-per-day (bpd) across five refineries, will serve the
niche mid-continent, Rocky Mountain and southwestern refining markets
and will have access to growing regional domestic and Canadian crude oil
supplies.
As previously announced, the Boards of Directors of both Frontier and
Holly unanimously approved a definitive merger agreement under which the
companies will combine in an all-stock merger of equals transaction. In
accordance with the terms of the merger agreement, Frontier shareholders
will receive 0.4811 Holly shares for each share of Frontier common stock
that they own at closing. The transaction is anticipated to be
consummated on July 1, 2011, and the combined entity will trade under
the symbol HFC.
About Frontier
Frontier Oil Corporation operates a 135,000 bpd refinery located in El
Dorado, Kansas, and a 52,000 bpd refinery located in Cheyenne, Wyoming,
and markets its refined products principally along the eastern slope of
the Rocky Mountains and in other neighboring plains states. Information
about the Company may be found on its website www.frontieroil.com.
Important Information for Investors and Shareholders
In connection with the proposed merger of equals transaction between
Holly and Frontier, Holly has filed with the Securities and Exchange
Commission ("SEC") a registration statement on Form S-4 that includes a
joint proxy statement of Holly and Frontier and constitutes a prospectus
of Holly, which the SEC has declared effective. Holly and Frontier may
also file other documents with the SEC concerning the proposed merger. INVESTORS
AND SECURITY HOLDERS OF HOLLY AND FRONTIER ARE URGED TO READ THE JOINT
PROXY STATEMENT/PROSPECTUS REGARDING THE PROPOSED MERGER AND OTHER
RELEVANT DOCUMENTS FILED WITH THE SEC CAREFULLY AND IN THEIR ENTIRETY
BECAUSE THEY CONTAIN IMPORTANT INFORMATION ABOUT THE PROPOSED MERGER.
Investors and security holders may obtain a free copy of the joint proxy
statement/prospectus and other documents containing important
information about Holly and Frontier through the website maintained by
the SEC at www.sec.gov.
Copies of the documents filed with the SEC by Holly are available free
of charge on Holly's website at www.hollycorp.com
under the tab "Investors" or by contacting Holly's Investor Relations
Department at (214) 871-3555. Copies of documents filed with the SEC by
Frontier are available free of charge on Frontier's website at www.frontieroil.com
under the tab "Investor Relations" and then under the tab "SEC Filings"
or by contacting Frontier's Investor Relations Department at
(713) 688-9600.
Cautionary Statement Regarding Forward-Looking Statements
This communication contains "forward-looking" statements within the
meaning of Section 27A of the Securities Act of 1933, and Section 21E of
the Securities Exchange Act of 1934. These include statements regarding
the effects of the proposed merger and statements preceded by, followed
by or that otherwise include the words "believes," "expects,"
"anticipates," "intends," "estimates," or similar expressions. Forward
looking statements relating to expectations about future results or
events are based upon information available to Holly and Frontier as of
today's date, and are not guarantees of the future performance of Holly,
Frontier or the combined company, and actual results may vary materially
from the results and expectations discussed. For instance, there is no
assurance that the proposed merger will be consummated. The merger
agreement will terminate if either Holly or Frontier fails to satisfy
conditions to closing. Additional risks and uncertainties related to the
proposed merger include, but are not limited to, the successful
integration of Holly's and Frontier's businesses and the combined
company's ability to compete in the highly competitive refining and
marketing industry. The revenues, earnings and business prospects of
Holly, Frontier and the combined company and their ability to achieve
planned business objectives will be subject to a number of risks and
uncertainties. These risks and uncertainties include, among other
things, risks and uncertainties with respect to the actions of actual or
potential competitive suppliers of refined petroleum products in
Holly's, Frontier's and the combined company's markets; the demand for
and supply of crude oil and refined products; the spread between market
prices for refined products and market prices for crude oil; the
possibility of constraints on the transportation of refined products;
the possibility of inefficiencies, curtailments or shutdowns in refinery
operations or pipelines; effects of governmental and environmental
regulations and policies; the availability and cost of financing; the
effectiveness of capital investments and marketing strategies;
efficiency in carrying out construction projects; the ability to acquire
refined product operations or pipeline and terminal operations on
acceptable terms and to integrate any existing or future acquired
operations; the possibility of terrorist attacks and the consequences of
any such attacks; and general economic conditions.
Holly and Frontier caution that the foregoing list of risks and
uncertainties is not exclusive. Additional information concerning these
and other risks is contained in Holly's and Frontier's most recently
filed Annual Report on Form 10-K, subsequent Quarterly Report on Form
10-Q, recent Current Reports on Form 8-K and other SEC filings. All
subsequent written and oral forward-looking statements concerning Holly,
Frontier, the proposed merger or other matters and attributable to Holly
or Frontier or any person acting on their behalf are expressly qualified
in their entirety by the cautionary statements above. Neither Holly nor
Frontier undertake any obligation to publicly update any of these
forward-looking statements to reflect events or circumstances that may
arise after the date hereof.

Frontier Oil Corporation
Kristine Boyd, 713-688-9600 x135
Source: Frontier Oil Corporation
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