We are exposed to credit losses primarily through our sales of refined products. Credit limits and/or prepayment requirements are set based on such factors as the customer’s financial results, credit rating, payment history, and industry and are reviewed annually for customers with material credit limits. Credit allowances are reviewed at least quarterly based on

changes in the customer’s creditworthiness due to economic conditions, liquidity, and business strategy as publicly reported and through discussions between the customer and the Company. We establish provisions for losses on trade receivables based on the estimated credit loss we expect to incur over the life of the receivable. We did not have a material change in our allowances on trade receivables during the years ended December 31, 2024, 2023, or 2022.

Commodity inventories, excluding commodity inventories at the Washington refinery, are stated at the lower of cost and net realizable value (“NRV”) using the first-in, first-out (“FIFO”) inventory accounting method. Commodity inventories at the Washington refinery are stated at the lower of cost and NRV using the last-in, first-out (“LIFO”) inventory accounting method. We value merchandise along with spare parts, materials, and supplies at average cost.

Crude oil held in storage tanks at the Hawaii refinery and certain crude oil in transit to be consumed by our Hawaii refinery are financed by Citi under the Inventory Intermediation Agreement as described in Note 12—Inventory Financing Agreements. The crude oil remains in the legal title of Citi and is stored in our storage tanks governed by a storage facilities agreement. Legal title to the crude oil passes to us at the tank outlet. Citi takes legal title of crude oil in transit at the specified purchase location with the third party supplier. We purchase the crude oil shipment from Citi at the SPM delivery point and we sell an equal quantity and quality of crude oil to Citi at the crude intake point. Legal title to crude oil in transit passes to us at the SPM delivery point for the upstream leg, and legal title passes to Citi at the crude intake point for the downstream leg. We record the inventory owned by Citi on our behalf as inventory with a corresponding obligation on our balance sheet in the amount we expect to pay to satisfy the repurchase obligation for the crude oil inventory then-owned by Citi following the expiration or termination of the Inventory Intermediation Agreement. Please read Note 12—Inventory Financing Agreements for further information.

We were a party to a supply and offtake agreement with J. Aron & Company LLC (“J. Aron”) to support our Hawaii refining operations (the “Supply and Offtake Agreement"). All of the crude oil utilized at the Hawaii refinery was financed by J. Aron under the Supply and Offtake Agreement as described in Note 12—Inventory Financing Agreements. The crude oil remained in the legal title of J. Aron and was stored in our storage tanks governed by a storage agreement. Legal title to the crude oil passed to us at the tank outlet. After processing, J. Aron held title to the refined products stored in our storage tanks until they were sold to our retail locations or to third parties. Additionally, certain of the crude oil utilized at the Hawaii refinery was also financed by the LC Facility as described in Note 12—Inventory Financing Agreements. On May 31, 2024, our Supply and Offtake Agreement with J.Aron expired, we early terminated our LC Facility, and we entered into an Inventory Intermediation Agreement with Citi; please read Note 12—Inventory Financing Agreements for further information. We also financed certain inventories at our other refineries through our ABL Credit Facility; please read Note 14—Debt for further information.

We were a party to an intermediation arrangement (the “Washington Refinery Intermediation Agreement”) with Merrill Lynch Commodities, Inc. (“MLC”) as described in Note 12—Inventory Financing Agreements. Under this arrangement, U.S. Oil & Refining Co., a wholly owned subsidiary, and certain affiliated entities (collectively, “U.S. Oil”) purchased crude oil supplied from third-party suppliers and MLC provided credit support for certain crude oil purchases. MLC’s credit support consisted of either providing a payment guaranty, causing the issuance of a letter of credit from a third-party issuing bank, or purchasing crude oil directly from third parties on our behalf. U.S. Oil held title to all crude oil and refined products inventories at all times and pledged such inventories, together with all receivables arising from the sales of these inventories, exclusively to MLC. On October 4, 2023, we terminated the Washington Refinery Intermediation Agreement; please read Note 12—Inventory Financing Agreements for further information.

Inventories also include Renewable Identification Numbers (“RINs”) and other environmental credits. Our environmental credit assets, which include RINs and other environmental credits are purchased through the open market, State of Washington auctions, or obtained by purchasing biofuels. When these biofuels are blended into our refined fuels, these credits, along with credits internally generated as part of our refining process, and purchased credits, are presented as Inventories on our consolidated balance sheets and stated at the lower of cost and NRV as of the end of the reporting period.

During the quarter ended December 31, 2023, we had a change in estimate in our valuation of our gross environmental credit obligations due to the settlement of all outstanding prior period environmental credit obligations (obligations associated with pre-2023 activities) and our prospective plan to use substantially all our RIN assets and other environmental credits to settle future environmental obligations. Beginning in the fourth quarter of 2023, the portion of the estimated gross environmental credit obligations satisfied by internally generated or purchased RINs or other environmental credits is recorded at the carrying value of such internally generated or purchased RINs or other environmental credits. The remainder of the estimated gross environmental credit obligation is recorded at the market price of the RINs or other environmental credits that are needed to satisfy the remaining obligation as of the end of the reporting period. Under the previous valuation technique, our liability would have been $295.9 million as of December 31, 2023, and Net income would have been lower by $9.0 million for the year ended December 31, 2023. Please read Note 16—Fair Value Measurements for further information. The net cost of environmental credits is recognized within Cost of revenues (excluding depreciation) on our consolidated statements of operations.

Effective February 21, 2023, we accounted for our Investment in Laramie Energy, LLC using the equity method as we have the ability to exert significant influence, but do not control its operating and financial policies. Our proportionate share of the net income (loss) of this entity is included in Equity earnings (losses) from Laramie Energy, LLC in our consolidated statements of operations. Prior to February 21, 2023, we did not apply the equity method of accounting for our investment in Laramie Energy because the book value of such investment had been reduced to zero. The investment is reviewed for impairment when events or changes in circumstances indicate that there may have been an other-than-temporary decline in the value of the investment. Please read Note 4—Investment in Laramie Energy for further information.

We capitalize the cost of additions and major improvements and modifications to property, plant, and equipment. The cost of repairs and normal maintenance of property, plant, and equipment is expensed as incurred. Major improvements and modifications of property, plant, and equipment are those expenditures that either extend the useful life, increase the capacity, or improve the operating efficiency of the asset or the safety of our operations. We compute depreciation of property, plant, and equipment using the straight-line method, based on the estimated useful life of each asset as follows:

From time to time, we enter into lease arrangements where we are the lessor in order to utilize a portion of our fixed assets not currently used in our primary operations. All of these lessor leases are classified as operating leases, whereby we do not derecognize the underlying asset, and the income from our customers is recognized as revenue on a straight-line basis over the lease term. Please read Note 17—Leases for further disclosures and information on leases.

We review property, plant, and equipment, operating leases, deferred turnaround costs, and other long-lived assets for impairment whenever events or changes in business circumstances indicate the carrying value of the assets may not be recoverable. Impairment is indicated when the undiscounted cash flows estimated to be generated by those assets are less than the assets’ carrying value. If this occurs, an impairment loss is recognized for the difference between the fair value and carrying value. Factors that indicate potential impairment include a significant decrease in the market value of the asset, operating or cash flow losses associated with the use of the asset, and a significant change in the asset’s physical condition or use.

We determine whether a contract is or contains a lease when we have the right to control the use of the identified asset in exchange for consideration. Lease liabilities and ROU assets are recognized at the commencement date based on the present value of lease payments over the lease term. We use our incremental borrowing rate in the calculation of present value unless the implicit rate can be readily determined, however, the lease liability associated with leases calculated through the use of implicit rates is not significant. Certain leases include provisions for variable payments based upon percentage of sales and/or other operating metrics; escalation provisions to adjust rental payments to reflect changes in price indices and fair market rents; and provisions for the renewal, termination, and/or purchase of the leased asset. We only consider fixed payments and those options that are reasonably certain to be exercised in the determination of the lease term and the initial measurement of lease liabilities and ROU assets. Expense for finance leases is recognized as amortization expense on a straight-line basis and interest expense on an effective rate basis over the lease term. Expense for operating lease payments is recognized as lease expense on a straight-line basis over the lease term. We do not separate lease and nonlease components of a contract. Leases with an initial term of 12 months or less are not recorded on the balance sheet. Finance lease ROU assets are presented within Property, plant, and equipment and operating lease ROU assets within Operating lease right-of-use assets on our consolidated balance sheets. Please read Note 17—Leases for further disclosures and information on leases.

We record asset retirement obligations (“AROs”) at fair value in the period in which we have a legal obligation, whether by government action or contractual arrangement, to incur these costs and can make a reasonable estimate of the fair value of the liability. Our AROs arise from our refining, logistics, and retail operations. AROs are calculated based on the present value of the estimated removal and other closure costs using our credit-adjusted risk-free rate. When the liability is initially recorded, we capitalize the cost by increasing the book value of the related long-lived tangible asset. The liability is accreted to its estimated settlement value with accretion expense recognized in Depreciation and amortization (“D&A”) on our consolidated statements of operations and the related capitalized cost is depreciated over the asset’s useful life. The difference between the settlement amount and the recorded liability is recorded as a gain or loss on asset disposals in our consolidated statements of operations. We estimate settlement dates by considering our past practice, industry practice, contractual terms, management’s intent, and estimated economic lives.

We cannot currently estimate the fair value for certain AROs primarily because we cannot estimate settlement dates (or ranges of dates) associated with these assets. These AROs include hazardous materials disposal (such as petroleum manufacturing by-products, chemical catalysts, and sealed insulation material containing asbestos) and removal or dismantlement requirements associated with the closure of our refining facilities, terminal facilities, or pipelines, including the demolition or removal of certain major processing units, buildings, tanks, pipelines, or other equipment.

Refinery turnaround costs, which are incurred in connection with planned major maintenance activities at our refineries, are deferred and amortized on a straight-line basis over the period of time estimated until the next planned turnaround (generally three to seven years). During 2024, 2023, and 2022, we recognized deferred turnaround costs of approximately $73.5 million, $5.9 million and $29.6 million, respectively. Deferred turnaround costs are presented within Other long-term assets on our consolidated balance sheets.

Goodwill represents the amount the purchase price exceeds the fair value of net assets acquired in a business combination. Goodwill is not amortized, but is tested for impairment annually on October 1. We assess the recoverability of the carrying value of goodwill during the fourth quarter of each year or whenever events or changes in circumstances indicate that the carrying amount of the goodwill of a reporting unit may not be fully recoverable. We first assess qualitative factors to determine whether it is more likely than not that the fair value of the reporting unit is less than its carrying value. If the qualitative assessment indicates that it is more likely than not that the carrying value of a reporting unit exceeds its estimated fair value, a quantitative test is required. Under the quantitative test, we compare the carrying value of the net assets of the reporting unit to the estimated fair value of the reporting unit. If the carrying value exceeds the estimated fair value of the reporting unit, an impairment loss is recorded.

Our intangible assets include relationships with customers, trade names, and trademarks. These intangible assets are amortized over their estimated useful lives on a straight-line basis. We evaluate the carrying value of our intangible assets when impairment indicators are present. When we believe impairment indicators may exist, projections of the undiscounted future cash flows associated with the use of and eventual disposition of the intangible assets are prepared. If the projections indicate that their carrying values are not recoverable, we reduce the carrying values to their estimated fair values.

We capitalize environmental expenditures that extend the life or increase the capacity of facilities as well as expenditures that prevent environmental contamination. We expense costs that relate to an existing condition caused by past operations and that do not contribute to current or future revenue generation. We record liabilities when environmental assessments and/or remedial efforts are probable and can be reasonably estimated. Cost estimates are based on the expected timing and extent of remedial actions required by governing agencies, experience gained from similar sites for which environmental assessments or remediation have been completed, and the amount of our anticipated liability considering the proportional liability and financial abilities of other responsible parties. Usually, the timing of these accruals coincides with the completion of a feasibility study or our commitment to a formal plan of action. Estimated liabilities are not discounted to present value and are presented within Other liabilities on our consolidated balance sheets. Environmental expenses are recorded in Operating expense (excluding depreciation) on our consolidated statements of operations.

All derivative instruments not designated as normal purchases or sales are recorded in the balance sheet as either assets or liabilities measured at their fair values. Changes in the fair value of these derivative instruments are recognized currently in earnings. We have not designated any derivative instruments as cash flow or fair value hedges and, therefore, do not apply hedge accounting treatment.

In addition, we may have other financial instruments, such as warrants or embedded debt features, that may be classified as liabilities when either (a) the holders possess rights to net cash settlement, (b) physical or net equity settlement is not in our control, or (c) the instruments contain other provisions that cause us to conclude that they are not indexed to our equity. As of December 31, 2024, our embedded derivative includes our obligations to repurchase crude oil from Citi at the termination of the Inventory Intermediation Agreement. Prior to the termination of the Supply and Offtake Agreement on May 31, 2024, we also had embedded derivatives for our obligations to repurchase crude oil and refined products from J. Aron. These liabilities were initially recorded at fair value and subsequently adjusted to fair value at the end of each reporting period through earnings.

We use the asset and liability method of accounting for income taxes. Under the asset and liability method, deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases and net operating loss (“NOL”) and tax credit carry forwards. Deferred tax assets and liabilities are measured using enacted income tax rates expected to apply to taxable income in the years in which those differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in income tax rates is recognized in the results of operations in the period that includes the enactment date. The realizability of deferred tax assets is evaluated quarterly based on a “more likely than not” standard and, to the extent this threshold is not met, a valuation allowance is recorded. We do not have any unrecognized tax benefits as of December 31, 2024.

otherwise barred by the statute of limitations in order to re-determine tax for an open year to which those items are carried. Therefore, in a year in which a NOL deduction is claimed, the IRS may examine the year in which the NOL was generated and adjust it accordingly for purposes of assessing additional tax in the year the NOL deduction was claimed. Any penalties or interest as a result of an examination will be recorded in the period assessed.

We recognize the cost of share-based payments on a straight-line basis over the period the employee provides service, generally the vesting period, and include such costs in General and administrative expense (excluding depreciation) and Operating expense (excluding depreciation) in our consolidated statements of operations. We account for forfeitures as they occur. The grant date fair value of restricted stock awards is equal to the market price of our common stock on the date of grant. The fair value of stock options is estimated using the Black-Scholes option-pricing model as of the date of grant. The fair value of the discount offered on the employee stock purchase plan is equal to 15% of the market price of our common stock on the purchase date.

Our refining and retail segment revenues are primarily associated with the sale of refined products. We recognize revenues upon physical delivery of refined products to a customer, which is the point in time at which control of the refined products is transferred to the customer. The pricing of our refined products is variable and primarily driven by commodity prices. The refining segment’s contracts with its customers state the terms of the sale, including the description, quantity, delivery terms, and price of each product sold. Payments from refining and bulk retail customers are generally due in full within 2 to 30 days of product delivery or invoice date. Payments from our other retail customers occur at the point of sale and are typically collected in cash or occur by credit or debit card. As such, we have no significant financing element to our revenues and have immaterial product returns and refunds.

We account for certain transactions on a net basis under Financial Accounting Standards Board (“FASB”) ASC Topic 845, “Nonmonetary Transactions.” These transactions include nonmonetary crude oil and refined product exchange transactions, certain crude oil buy/sell arrangements, and sale and purchase transactions entered into with the same counterparty that are deemed to be in contemplation with one another.

Cost of revenues (excluding depreciation) includes the hydrocarbon-related costs of inventory sold, transportation costs of delivering product to customers, crude oil consumed in the refining process, costs to satisfy our environmental credit obligations, and certain hydrocarbon fees and taxes. Cost of revenues (excluding depreciation) also includes the unrealized gains and losses on derivatives and inventory valuation adjustments. Certain direct operating expenses related to our logistics segment are also included in Cost of revenues (excluding depreciation).

The accounting policies of individual segments are the same as those described here in Note 2—Summary of Significant Accounting Policies except that non-operating expenses and income are recorded and evaluated on a consolidated basis. Operating expense includes certain shared costs such as finance, accounting, tax, human resources, information technology, and legal costs that are not directly attributable to specific operating segments. These expenses are allocated based on various criteria, generally reflecting the time and resources provided to each segment. The Chief Executive Officer, the chief operating decision maker (“CODM”), primarily evaluates segment performance based on segment-level Adjusted Gross Margin and Adjusted EBITDA. We have provided additional disclosure on Cost of revenues disaggregated by significant category by segment, consistent with the disclosure requirements outlined in Accounting Standards Update (“ASU”) 2023-07.

We recognize an asset for the overfunded status or a liability for the underfunded status of our defined benefit pension plans (the “Benefit Plans”). The underfunded status of our Benefit Plans is recorded within Other liabilities on our consolidated balance sheets and the funded status of our Benefit Plans is recorded within Other long-term assets on our consolidated balance sheets. Certain changes in the plans’ funded status are recognized in Other comprehensive income (loss) in the period the change occurs.

Fair value is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date (exit price). Fair value measurements are categorized with the highest priority given to unadjusted quoted prices in active markets for identical assets or liabilities and the lowest priority given to unobservable inputs. The three levels of the fair value hierarchy are as follows:

The level in the fair value hierarchy within which the fair value measurement is categorized is based on the lowest level input that is significant to the fair value measurement. Our assessment of the significance of a particular input to the fair value measurement requires judgment and may affect the valuation of the fair value of assets and liabilities and their placement within the fair value hierarchy levels. Our policy is to recognize transfers in and/or out of fair value hierarchy levels as of the end of the reporting period for which the event or change in circumstances caused the transfer. We have consistently applied these valuation techniques for the periods presented. The fair value of the derivatives related to the Citi repurchase obligation and the J. Aron repurchase obligation, which was terminated on May 31, 2024, are and were measured, respectively, using estimates of the prices and differentials assuming settlement at the end of the reporting period.

Basic income (loss) per share (“EPS”) is computed by dividing net income (loss) attributable to common stockholders by the sum of the weighted-average number of common shares outstanding. Basic and diluted EPS are computed taking into account the effect of participating securities. Participating securities include restricted stock that has been issued but has not yet vested. Please read Note 21—Income (Loss) Per Share for further information.

We may, on occasion, enter into transactions denominated in currencies other than the U.S. dollar, which is our functional currency. Gains and losses resulting from changes in currency exchange rates between the functional currency and the currency in which a transaction is denominated are included in Other income (expense), net, in the accompanying consolidated statement of operations in the period in which the currency exchange rates change. For the years ended December 31, 2024, 2023 and 2022, gains and losses resulting from changes in currency translations were immaterial.

On November 4, 2024, the FASB issued ASU 2024-03, Income Statement—Reporting Comprehensive Income—Expense Disaggregation Disclosures. This ASU requires companies to disclose, in the notes to financial statements, specified information about certain costs and expenses. The amendments in this ASU are effective for annual reporting periods beginning after December 15, 2026, and interim reporting periods beginning after December 15, 2027. Early adoption is permitted. We are currently evaluating the impact of adopting the new guidance on filings subsequent to the effective date.

On December 14, 2023, the FASB issued ASU 2023-09, Improvements to Income Tax Disclosure (Topic 740). This ASU requires public business entities to disclose additional information in specified categories with respect to the reconciliation of the effective tax rate to the statutory rate for federal, state, and foreign income taxes. It also requires greater detail about individual reconciling items in the rate reconciliation to the extent the impact of those items exceeds a specified threshold. Additionally, the ASU requires information pertaining to taxes paid (net of refunds received) to be disaggregated for federal, state, and foreign taxes and further disaggregated for specific jurisdictions to the extent the related amounts exceed a quantitative threshold. The guidance in ASU 2023-09 is effective for fiscal years beginning after December 15, 2025. This ASU therefore does not impact our 2024 Form 10-K. Par will assess the impact of this ASU on our 2025 Form 10-K annual segment disclosures as part of our fiscal year 2025 procedures.

On December 31, 2024, we adopted ASU No. 2023-07, Improvements to Reportable Segment Disclosures (Topic 280) (“ASU 2023-07”). The amendments in ASU 2023-07 improve reportable segment disclosure requirements, primarily through enhanced disclosures about significant segment expenses. Please read Note 23—Segment Information for further information on the additional disclosures.

On January 1, 2022, we adopted ASU No. 2021-08, Business Combinations (Topic 805): Accounting for Contract Assets and Contract Liabilities from Contracts with Customers (“ASU 2021-08”). This ASU changes accounting for recording contract assets and liabilities acquired in a business combination to improve comparability and consistency. During the Billings Acquisition in June 2023, no contract assets or liabilities were acquired, thus our adoption of ASU 2021-08 did not have an impact on our financial condition, results of operations, and cash flows.