HOUSTON--(BUSINESS WIRE)--
June 20, 2011 — Frontier Oil Corporation (NYSE: FTO) ("Frontier") today
announced that it has submitted written notice to the New York Stock
Exchange (the "NYSE") of its intention to voluntarily delist its common
stock, no par value, from the NYSE pending successful closing of the
merger of Frontier with Holly Corporation (the "Closing"). Pending the
Closing, Frontier intends to have the NYSE file a Form 25 with the
Securities and Exchange Commission (the "SEC") on July 1, 2011 to delist
its common stock. Also pending the Closing, Frontier intends to file a
Form 15 with the SEC on or about July 11, 2011 in order to terminate the
registration of the common stock under Section 12 of the Securities
Exchange Act of 1934, as amended (the "Exchange Act"), and to notify the
SEC of the automatic suspension of its public reporting obligations
under Sections 13(a) and 15(d) of the Exchange Act.
As previously announced, Frontier entered into an Agreement and Plan of
Merger, dated as of February 21, 2011 (the "Merger Agreement"), by and
among Frontier, Holly Corporation ("Holly"), and North Acquisition, Inc.
("Merger Sub") pursuant to which Merger Sub will merge with and into
Frontier (the "Merger"). Pursuant to the Merger Agreement, upon
consummation of the Merger (a) each outstanding share of Frontier common
stock (subject to certain exceptions) will be converted into 0.4811
shares of Holly common stock, (b) certain outstanding Frontier equity
awards issued under the Frontier Omnibus Incentive Compensation Plan (as
amended and as may be further amended from time to time, the "Frontier
Plan") will vest and be converted into shares of Holly common stock and
(c) certain outstanding Frontier equity awards issued under the Frontier
Plan will be converted into comparable Holly equity awards. As a result
of the Merger, a trading market for Frontier's common stock will no
longer exist. In addition, upon the delisting, Frontier will qualify to
terminate the registration of its common stock under Section 12 of the
Exchange Act and exit the SEC periodic reporting system. The common
stock will not be listed or registered on another national securities
exchange or for quotation in a quotation medium.
As of the date of the filing of the Form 15, Frontier's obligation to
file certain reports under the Exchange Act, including Forms 10-K, 10-Q
and 8-K, will be immediately suspended, and other filing requirements
will terminate upon the effectiveness of the deregistration, which
should occur 90 days after the filing of the Form 15.
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
This communication does not constitute an offer to sell or the
solicitation of an offer to buy any securities or a solicitation of any
vote or approval. The issuance of Holly Corporation ("Holly") common
stock in connection with the proposed merger has been submitted to
Holly's stockholders for their consideration, and the proposed merger
has been submitted to shareholders of Frontier Oil Corporation
("Frontier") for their consideration. Holly has filed with the
Securities and Exchange Commission ("SEC") a registration statement on
Form S-4 that includes a joint proxy statement to be used by Holly and
Frontier to solicit the required approval of their shareholders in
connection with the proposed merger and constituted 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.
Holly, Frontier and certain of their respective directors and executive
officers may be deemed to be participants in the solicitation of proxies
from the stockholders of Holly and shareholders of Frontier in
connection with the proposed transaction. Information about the
directors and executive officers of Holly is set forth in its proxy
statement for its 2011 annual meeting of stockholders, which was filed
with the SEC on March 31, 2011. Information about the directors and
executive officers of Frontier is set forth in its proxy statement for
its 2011 annual meeting of shareholders, which was filed with the SEC on
March 21, 2011. These documents can be obtained free of charge from the
sources indicated above. Other information regarding the participants in
the proxy solicitation and a description of their direct and indirect
interests, by security holdings or otherwise, are contained in the joint
proxy statement/prospectus and other relevant materials filed with the
SEC.
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 the companies do not receive the
necessary approval of Holly's stockholders or Frontier's shareholders or
government approvals or 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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