Business Combination Agreement (Form 8-K)

Other Events.

As previously disclosed, on August 2, 2021, Holly Energy Partners, L.P. ("HEP"), The Sinclair Companies, a Wyoming corporation ("Sinclair HoldCo"), and Sinclair Transportation Company, a Delaware corporation and wholly owned subsidiary of Sinclair HoldCo ("STC"), entered into a Contribution Agreement (the "Contribution Agreement") pursuant to which HEP will acquire all of the outstanding shares of STC in exchange for 21 million newly issued common limited partner units of HEP and cash consideration equal to $325 million (the "HEP Transactions").

The HEP Transactions are subject to the satisfaction or waiver of certain customary conditions, including, among others (i) the expiration or early termination of the applicable waiting period under the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended (the "HSR Act"), and receipt of other required regulatory consents and approvals and (ii) the consummation of the transactions contemplated by that certain Business Combination Agreement, dated as of August 2, 2021 (the "Business Combination Agreement"), by and among HollyFrontier Corporation ("HollyFrontier"), Hippo Parent Corporation, a wholly owned subsidiary of HollyFrontier ("New Parent"), Hippo Merger Sub, Inc., a wholly owned subsidiary of New Parent, Sinclair HoldCo and Hippo Holding LLC, a wholly owned subsidiary of Sinclair HoldCo, which will occur immediately following the HEP Transactions (the "HFC Transactions", and together with the HEP Transactions, the "Sinclair Transactions"). The ultimate general partner of HEP, Holly Logistic Services, L.L.C ("HLS"), is a wholly owned subsidiary of HollyFrontier.

On August 23, 2021, each of HollyFrontier and Sinclair HoldCo filed its respective premerger notification and report regarding the Sinclair Transactions with the U.S. Department of Justice and the U.S. Federal Trade Commission (the "FTC") under the HSR Act.

On September 22, 2021, HollyFrontier and Sinclair HoldCo each received a request for additional information and documentary material ("Second Request") from the FTC in connection with the FTC's review of the Sinclair Transactions.

Issuance of the Second Request extends the waiting period under the HSR Act until 30 days after both HollyFrontier and Sinclair HoldCo have substantially complied with the Second Request, unless the waiting period is terminated earlier by the FTC or the parties otherwise commit not to close the Sinclair Transactions for some additional period of time. HollyFrontier and Sinclair HoldCo will continue to cooperate with the FTC staff in its review.

HollyFrontier and HEP continue to expect that the Sinclair Transactions will be completed in mid-2022.The completion of the Sinclair Transactions remains subject to the expiration or termination of the waiting period under the HSR Act and the satisfaction or waiver of the other closing conditions specified in the Business Combination Agreement and the Contribution Agreement.

Additional Information and Where to Find It

The issuance of 60,230,036 shares of New Parent common stock, par value $0.01 per share, in connection with the HFC Transactions (the "Sinclair Stock Consideration") will be submitted to HollyFrontier's stockholders for their consideration. In connection with the issuance of the

Sinclair Stock Consideration, HollyFrontier filed a preliminary proxy statement with the Securities and Exchange Commission ("SEC") on September 17, 2021. Additionally, HollyFrontier will file other relevant materials with the SEC in connection with the issuance of the Sinclair Stock Consideration, including a definitive proxy statement. This communication is not intended to be, and is not, a substitute for such filings or for any other document that HollyFrontier may file with the SEC in connection with the issuance of the Sinclair Stock Consideration. SECURITY HOLDERS ARE URGED TO READ THE DEFINITIVE PROXY STATEMENT AND ALL RELEVANT DOCUMENTS FILED WITH THE SEC CAREFULLY AND IN THEIR ENTIRETY WHEN THEY BECOME AVAILABLE BECAUSE THEY WILL CONTAIN IMPORTANT INFORMATION ABOUT HOLLYFRONTIER, THE ISSUANCE OF THE SINCLAIR STOCK CONSIDERATION AND THE HFC TRANSACTIONS. Security holders can obtain copies of the preliminary proxy statement and any other documents filed by HollyFrontier with the SEC, and will be able to obtain copies of the definitive proxy statement and other relevant materials (when they become available), free of charge at the SEC's website at www.sec.gov. In addition, security holders will be able to obtain free copies of the definitive proxy statement from HollyFrontier by submitting a written request either to Vice President, Investor Relations, HollyFrontier Corporation, 2828 N. Harwood, Suite 1300, Dallas, TX 75201 or to [email protected], by calling HollyFrontier's Investor Relations department at (214) 954-6510,or by going to HollyFrontier's corporate website at www.hollyfrontier.comunder the tab "Investor Relations" and under the heading "Financial Information" and subheading "SEC Filings."

Participants in Solicitation

HollyFrontier and its directors and certain of its executive officers and employees may be deemed to be participants in the solicitation of proxies from HollyFrontier stockholders in connection with the issuance of the Sinclair Stock Consideration. Information about HollyFrontier's directors and executive officers is available in HollyFrontier's definitive proxy statement for its 2021 annual meeting of stockholders filed with the SEC on March 25, 2021. Other information regarding persons who may be deemed participants in the proxy solicitation, including their direct or indirect interests by security holdings or otherwise, is set forth in the preliminary proxy statement HollyFrontier filed with the SEC on September 17, 2021 and may be updated or supplemented in the definitive proxy statement and other relevant materials to be filed with the SEC in connection with the issuance of the Sinclair Stock Consideration when they become available. These documents can be obtained free of charge from the sources indicated above.

Cautionary Statement Regarding Forward-Looking Statements

This communication may contain or incorporate by reference statements or information that are, include or are based on forward-looking statements within the meaning of the safe-harbor provisions of the Private Securities Litigation Reform Act of 1995. Forward-looking statements give expectations, intentions, beliefs or forecasts of future events or otherwise for the future, and can be identified by the fact that they relate to future actions, performance or results rather than relating strictly to historical or current facts. Words such as "anticipate(s)," "project(s)," "expect(s)," "plan(s)," "goal(s)," "forecast(s)," "strategy," "intend(s)," "should," "would," "could," "believe," "may," and variations of such words and other words and expressions of

similar meaning are intended to identify such forward-looking statements. However, the absence of such words or other words and expressions of similar meaning does not mean that a statement is not forward-looking.

These forward-looking statements include, but are not limited to, statements regarding the Sinclair Transactions. Forward-looking statements are inherently uncertain and necessarily involve risks that may affect the business prospects and performance of HEP and/or HollyFrontier, and they are not guarantees of future performance. These forward-looking statements are based on assumptions using currently available information and expectations as of the date thereof that the management of HEP's ultimate general partner believes are reasonable, but that involve certain risks and uncertainties and may prove inaccurate. Therefore, actual outcomes and results could materially differ from what is expressed, implied or forecasted in these statements. Any differences could be caused by a number of factors including, but not limited to (i) the failure of HEP and HollyFrontier to successfully close the Sinclair Transactions or, once closed, integrate the operations of Sinclair with their existing operations and fully realize the expected synergies of the Sinclair Transactions or on the expected timeline, (ii) the satisfaction or waiver of the conditions precedent to the proposed Sinclair Transactions, including, without limitation, the receipt of the HollyFrontier stockholder approval for the issuance of New Parent common stock at closing and the receipt of regulatory approvals (including clearance by antitrust authorities necessary to complete the Sinclair Transactions) on the terms and timeline desired, (iii) risks relating to the value of HEP's common limited partner units to be issued at the closing of the Sinclair Transactions from sales in anticipation of closing and from sales by the Sinclair holders following the closing of the HEP Transaction, (iv) legal proceedings that may be instituted against HEP following the announcement of the proposed Sinclair Transactions, (v) disruption the Sinclair Transactions may cause to customers, vendors, business partners and HollyFrontier's and HEP's ongoing business, (vii) the extraordinary market environment and effects of the COVID-19pandemic, including a significant decline in demand for refined petroleum products in the markets we serve, risks and uncertainties with respect to the actions of actual or potential competitive suppliers and transporters of refined petroleum or lubricant and specialty products in HollyFrontier's and HEP's markets, the spread between market prices for refined products and market prices for crude oil, the possibility of constraints on the transportation of refined products or lubricant and specialty products, the possibility of inefficiencies, curtailments or shutdowns in refinery operations or pipelines, whether due to infection in the work force or in response to reductions in demand, effects of current and future governmental and environmental regulations and policies, including the effects of current and future restrictions on various commercial and economic activities in response to the COVID-19pandemic, and (viii) other factors, including those listed in the most recent annual, quarterly and periodic reports of HollyFrontier and HEP filed with the SEC, whether or not related to the Sinclair Transactions. All forward-looking statements included in this report are expressly qualified in their entirety by the foregoing cautionary statements. The forward-looking statements speak only as of the date made and, other than as required by law, HEP assumes no, and expressly disclaims any, duty or obligation to update or correct any forward-looking statement as a result of events, changes, effects, states of facts, conditions, circumstances, occurrences or developments subsequent to the date of this communication or otherwise. Readers are advised, however, to consult any further disclosures HEP makes in its filings with the SEC.

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