Exhibit 99.1

Management's Report

The accompanying consolidated financial statements of United States Steel Corporation are the responsibility of and have been prepared by United States Steel Corporation in conformity with accounting principles generally accepted in the United States of America. They necessarily include some amounts that are based on best judgments and estimates. United States Steel Corporation financial information displayed in other sections of this report is consistent with these financial statements.

        United States Steel Corporation seeks to assure the objectivity and integrity of its financial records by careful selection of its managers, by organizational arrangements that provide an appropriate division of responsibility and by communications programs aimed at assuring that its policies and methods are understood throughout the organization.

        United States Steel Corporation has a comprehensive formalized system of disclosure controls and procedures designed to provide reasonable assurance that assets are safeguarded, that financial records are reliable and that information required to be disclosed in reports filed with or submitted to the Securities and Exchange Commission is recorded, processed, summarized and reported within the required time limits. Appropriate management monitors the system for compliance and evaluates it for effectiveness, and the internal auditors independently measure its effectiveness and recommend possible improvements thereto. In addition, as part of their audit of the financial statements, United States Steel Corporation's independent accountants review disclosure controls and procedures selectively to establish a basis of reliance thereon in determining the nature, extent and timing of audit tests to be applied.

        The Board of Directors pursues its oversight role in the area of financial reporting and disclosure controls and procedures through its Audit & Finance Committee. This Committee, composed solely of nonmanagement directors, regularly meets (jointly and/or separately) with the independent accountants, management, internal auditors and members of the disclosure committee to monitor the proper discharge by each of their responsibilities relative to disclosure controls and procedures and the Corporation's financial statements.

F-1

Report of Independent Accountants

To the Stockholders of United States Steel Corporation:

In our opinion, the accompanying consolidated balance sheets and the related consolidated statements of operations, stockholders' equity and cash flows present fairly, in all material respects, the financial position of United States Steel Corporation and its subsidiaries at December 31, 2002 and 2001, and the results of their operations and their cash flows for each of the three years in the period ended December 31, 2002 in conformity with accounting principles generally accepted in the United States of America. These financial statements are the responsibility of United States Steel Corporation's management; our responsibility is to express an opinion on these financial statements based on our audits. We conducted our audits of these statements in accordance with auditing standards generally accepted in the United States of America, which require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement. An audit includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements, assessing the accounting principles used and significant estimates made by management, and evaluating the overall financial statement presentation. We believe that our audits provide a reasonable basis for our opinion.

/s/ PricewaterhouseCoopers LLP

PricewaterhouseCoopers LLP
Pittsburgh, Pennsylvania
February 25, 2003, except as to Note 8
which is as of November 7, 2003

F-2

Statement of Operations

The accompanying notes are an integral part of these financial statements.

F-3

Balance Sheet

The accompanying notes are an integral part of these financial statements.

F-4

Statement of Cash Flows

See Note 9, for supplemental cash flow information.
The accompanying notes are an integral part of these financial statements.

F-5

Statement of Stockholders' Equity

The accompanying notes are an integral part of these financial statements.

F-6

Notes to Financial Statements

1. Basis of Presentation

United States Steel Corporation (U. S. Steel) owns and operates the former steel businesses of USX Corporation, now named and referred to herein as Marathon Oil Corporation (Marathon). U. S. Steel is engaged domestically in the production, sale and transportation of steel mill products, coal, coke, and taconite pellets (iron ore); steel mill products distribution; the management of mineral resources; the management and development of real estate; and engineering and consulting services and, through U. S. Steel Kosice (USSK) in the Slovak Republic, in the production and sale of steel mill products and coke primarily for the central and western European markets.

        Prior to December 31, 2001, the businesses of U. S. Steel comprised an operating unit of Marathon. Marathon had two outstanding classes of common stock: USX—Marathon Group common stock, which was intended to reflect the performance of Marathon's energy business, and USX—U. S. Steel Group common stock (Steel Stock), which was intended to reflect the performance of Marathon's steel business. As described further in Note 2, on December 31, 2001, U. S. Steel was capitalized through the issuance of 89.2 million shares of common stock to holders of Steel Stock in exchange for all outstanding shares of Steel Stock on a one-for-one basis.

        The accompanying consolidated balance sheets as of December 31, 2002 and 2001, and statements of operations and cash flows for the year ended December 31, 2002, reflect the financial position, results of operations and cash flows of U. S. Steel as a separate, stand-alone entity. Combined statements of operations and of cash flows for each of the two years in the period ended December 31, 2001, represent a carve-out presentation of the businesses comprising U. S. Steel, and are not intended to be a complete presentation of the results of operations and cash flows of U. S. Steel on a stand-alone basis. Marathon's net investment in U. S. Steel represented the combined net assets of the businesses comprising U. S. Steel and was presented in lieu of common stockholders' equity. The allocations and estimates included in these combined financial statements for the years 2001 and 2000 were determined using the methodologies described below:

Financial activities — As a matter of policy, Marathon historically managed most financial activities on a centralized, consolidated basis. Transactions related primarily to invested cash, short-term and long-term debt (including convertible debt), related net interest and other financial costs, and preferred stock and related dividends were attributed to U. S. Steel based upon its cash flows for each of the periods presented and its initial capital structure. However, transactions such as leases, certain collateralized financings, certain indexed debt instruments and transactions related to securities convertible solely into Steel Stock were specifically attributed to U. S. Steel.

Corporate general and administrative costs — Corporate general and administrative costs were allocated to U. S. Steel based upon utilization or other methods management believed to be reasonable and which considered certain measures of business activities, such as employment, investments and revenues.

Income taxes — The results from the businesses comprising U. S. Steel were included in the consolidated federal income tax returns of Marathon through 2001. The consolidated provision and the related tax payments or refunds were reflected in U. S. Steel's combined financial statements in accordance with Marathon's tax allocation policy. In general, such policy provided that the consolidated tax provision and related tax payments or refunds were allocated to U. S. Steel, based principally upon the financial income, taxable income, credits, preferences and other amounts directly related to U. S. Steel.

F-7

        For tax provision and settlement purposes, tax benefits resulting from attributes (principally net operating losses and various tax credits), which could not be utilized by U. S. Steel on a separate return basis but which could be utilized on a consolidated basis in that year or in a carryback year, were allocated to U. S. Steel if it generated the attributes. As a result, the allocated group amounts of taxes payable or refundable were not necessarily comparable to those that would have resulted if U. S. Steel had filed its own separate tax returns.

        In connection with the Separation discussed in Note 2, U. S. Steel and Marathon entered into a tax sharing agreement, which is discussed in Notes 13 and 25.

2. The Separation

On December 31, 2001, in accordance with the Agreement and Plan of Reorganization approved by the shareholders of Marathon, Marathon converted each share of Steel Stock into the right to receive one share of U. S. Steel common stock (the Separation).

        In connection with the Separation, U. S. Steel was required to repay or replace certain indebtedness and other obligations of Marathon so that the amount of indebtedness and other obligations for which U. S. Steel was responsible immediately following the Separation would be $900 million less than the net amounts attributed to U. S. Steel immediately prior to the Separation (Value Transfer). Any difference between the two amounts, adjusted for the Value Transfer, was to be settled in cash (Cash Settlement). During the last six months of 2001, U. S. Steel completed a number of financings in order to repay or replace certain indebtedness and other obligations of Marathon.

        At December 31, 2001, the net debt and other obligations of U. S. Steel was $54 million less than the net debt and other obligations attributed to U. S. Steel, adjusted for the Value Transfer. As a result, U. S. Steel recorded a $54 million payable to Marathon for the Cash Settlement. In accordance with the terms of the Separation, U. S. Steel paid Marathon $54 million, plus applicable interest, on February 6, 2002.

        The net assets of U. S. Steel at Separation were approximately the same as the net assets attributed to U. S. Steel immediately prior to the Separation, except for the Value Transfer and the impacts of certain other transactions directly related to the Separation. The following table reconciles the net assets attributed to U. S. Steel immediately prior to the Separation with the net assets of U. S. Steel immediately following the Separation:

        In connection with the Separation, U. S. Steel and Marathon entered into the following Agreements:

Financial Matters Agreement — This agreement establishes the responsibilities of U. S. Steel and Marathon relating to certain corporate obligations of Marathon at the time of Separation as follows:

•

The assumption by U. S. Steel of certain industrial revenue bonds and certain other financial obligations of Marathon. See Notes 11 and 25 for details.



•

Obligations for which Marathon is solely responsible.

F-8

•

Obligations of Marathon for which U. S. Steel remains contingently liable. See Note 25 for details.



•

Obligations of U. S. Steel for which Marathon remains contingently liable.

Tax Sharing Agreement — See Notes 13 and 25, for a discussion of this agreement.

Transition Services Agreement — This agreement provided that, to the extent that one company or the other was not able to immediately service its own needs relating to services formerly managed on a corporate-wide basis, U. S. Steel and Marathon would enter into a transition services agreement whereby one company would provide such services to the other to the extent requested if the providing company was able to do so. Such agreements would be for a term of up to twelve months and be on a cost reimbursement basis. This agreement expired at December 31, 2002.

License Agreement — This agreement granted to U. S. Steel a non-exclusive license to use the USX name rights and certain intellectual property with the right to sublicense.

Insurance Assistance Agreement — This agreement provides for the division of responsibility for joint insurance arrangements and the associated payment of insurance claims and deductibles following the Separation for claims associated with pre-Separation periods.

        For other activities between U. S. Steel and Marathon, see Note 14.

3. Summary of Principal Accounting Policies

Principles applied in consolidation — These financial statements include the accounts of U. S. Steel and its majority-owned subsidiaries. Intercompany accounts, transactions and profits have been eliminated in consolidation.

        The accounts of businesses acquired have been included in the consolidated financial statements from the dates of acquisition. See Note 5 for further discussion of businesses acquired.

        Investments in entities over which U. S. Steel has significant influence are accounted for using the equity method of accounting and are carried at U. S. Steel's share of net assets plus loans and advances. Differences in the basis of the investment and the underlying net asset value of the investee, if any, are amortized into earnings over the remaining useful life of the associated assets.

        Investments in companies whose stock is publicly traded are carried generally at market value. The difference between the cost of these investments and market value is recorded in other comprehensive income (net of tax). Investments in companies whose stock has no readily determinable fair value are carried at cost and are periodically reviewed for impairment.

        Income (loss) from investees includes U. S. Steel's proportionate share of income (loss) from equity method investments. Also, gains or losses from changes in ownership of unconsolidated investees are recognized in the period of change. Unrealized profits and losses on transactions with equity investees have been eliminated in consolidation.

Use of estimates — Generally accepted accounting principles require management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at year-end and the reported amounts of revenues and expenses during the year. Significant items subject to such estimates and assumptions include the carrying value of property, plant and equipment; valuation allowances for receivables, inventories and deferred income tax assets; environmental liabilities; liabilities for potential tax deficiencies and potential litigation claims and settlements; and assets and obligations related to employee benefits. Actual results could differ from the estimates and assumptions used.

F-9

Revenue recognition — Revenues are primarily recognized when products are shipped, properties are sold or services are provided to customers, the sales price is fixed and determinable, collectibility is reasonably assured, and title and risks of ownership have passed to the buyer. Revenues for mineral interest royalties are generally recorded when the cash is received, which approximates the accrual method. Shipping and other transportation costs charged to buyers are recorded in both revenues and cost of revenues.

Cash and cash equivalents — Cash and cash equivalents include cash on hand and on deposit and investments in highly liquid debt instruments with maturities generally of three months or less.

Inventories — Inventories are carried at lower of cost or market on a worldwide basis. Cost of inventories is determined primarily under the last-in, first-out (LIFO) method.

Derivative instruments — U. S. Steel uses commodity-based and foreign currency derivative instruments to manage its exposure to price risk. Futures, forwards, swaps and options are used to reduce the effects of fluctuations in the purchase price of natural gas and nonferrous metals and also certain business transactions denominated in foreign currencies. U. S. Steel has not elected to designate derivative instruments as qualifying for hedge accounting treatment. As a result, the changes in fair value of all derivatives are recognized immediately in results of operations.

Property, plant and equipment — U. S. Steel records depreciation on a modified straight-line or straight-line method utilizing a composite or group asset approach based upon estimated lives of assets. The modified straight-line method is utilized for domestic steel producing assets and is based upon production levels. The modification factors applied to straight-line calculations range from a minimum of 85% at a production level below 81% of capability, to a maximum of 105% for a 100% production level. No modification is made at the 95% production level, considered the normal long-range level.

        Depletion of mineral properties is based on rates which are expected to amortize cost over the estimated tonnage of minerals to be removed.

        U. S. Steel evaluates impairment of its property, plant and equipment on an individual asset basis or by logical groupings of assets whenever circumstances indicate that the carrying value may not be recoverable. Assets deemed to be impaired are written down to their fair value, including any related goodwill, using discounted future cash flows and, if available, comparable market values.

        When property, plant and equipment depreciated on an individual basis are sold or otherwise disposed of, any gains or losses are reflected in income. Gains on disposal of long-lived assets are recognized when earned, which is generally at the time of closing. If a loss on disposal is expected, such losses are recognized when the assets are reclassified as assets held for sale. Proceeds from the disposal of property, plant and equipment depreciated on a group basis are credited to accumulated depreciation, depletion and amortization with no immediate effect on income.

Major maintenance activities — U. S. Steel incurs planned major maintenance costs primarily for blast furnace relines. Costs that extend the life of the asset are separately capitalized in property, plant and equipment and are amortized over their estimated useful life, which is generally the period until the next scheduled reline. All other repair and maintenance costs are expensed as incurred.

Environmental remediation — Environmental expenditures are capitalized if the costs mitigate or prevent future contamination or if the costs improve existing assets' environmental safety or efficiency. U. S. Steel provides for remediation costs and penalties when the responsibility to remediate is probable and the amount of associated costs is reasonably determinable. Generally, the timing of remediation accruals coincides with completion of a feasibility study or the commitment to a formal plan of action. Remediation liabilities are accrued based on estimates of known environmental

F-10

exposure and are discounted if the amount and timing of the cash disbursements are readily determinable.

Pensions, other postretirement and postemployment benefits — U. S. Steel has noncontributory defined benefit pension plans and defined benefit retiree health care and life insurance plans (other postretirement benefits) that cover most of its domestic employees on their retirement. The net pension and other postretirement benefits obligations recorded and the related periodic costs are based on, among other things, assumptions of the discount rate, estimated return on plan assets, salary increases, the mortality of participants and the current level and escalation of health care costs in the future. Additionally, U. S. Steel recognizes an obligation to provide postemployment benefits, primarily for disability-related claims covering indemnity and medical payments for certain domestic employees. The obligation for these claims and the related periodic costs are measured using actuarial techniques and assumptions. Actuarial gains and losses are deferred and amortized over future periods.

Concentration of credit and business risks — U. S. Steel is exposed to credit risk in the event of nonpayment by customers principally within the automotive, steel, container and construction industries. Changes in these industries may significantly affect management's estimates and U. S. Steel's financial performance. U. S. Steel mitigates its exposure to credit risk by performing ongoing credit evaluations and, when deemed necessary, requiring letters of credit, guarantees or collateral. USSK mitigates credit risk for approximately 75% of its revenues by requiring bank guarantees, letters of credit, credit insurance, prepayment or other collateral.

        The majority of U. S. Steel's customers are located in the United States and Central and Western Europe. No single customer accounts for more than 5% of gross annual revenues.

Foreign currency risk — U. S. Steel, primarily through USSK, is subject to the risk of price fluctuations due to the effects of exchange rates on revenues and operating costs, firm commitments for capital expenditures and existing assets or liabilities denominated in currencies other than the U.S. dollar.

Stock-based compensation — U. S. Steel has various stock-based employee compensation plans, which are described more fully in Note 19. The Company accounts for those plans under the recognition and measurement principles of APB Opinion No. 25, "Accounting for Stock Issued to Employees," and related Interpretations. No stock-based employee compensation cost is reflected in net income for the stock options or stock appreciation rights (SARs) at the date of grant, as all options and SARs granted had an exercise price equal to the market value of the underlying common stock. When the stock price exceeds the grant price, SARs are adjusted for changes in the market value and compensation expense is recorded. Deferred compensation for restricted stock under the United States Steel Corporation 2002 Stock Plan (2002 Stock Plan) and the USX Corporation 1990 Stock Plan (1990 Stock Plan) is charged to equity when the restricted stock is granted and subsequently adjusted for changes in the market value of the underlying stock. The deferred compensation is then expensed over the vesting period and adjusted if conditions of the restricted stock grant are not met. Deferred compensation for the restricted stock plan for certain salaried employees who are not officers of the Corporation is charged to equity when the restricted stock is granted and subsequently expensed over the vesting period.

F-11

        The following table illustrates the effect on net income and earnings per share if the Company had applied the fair value recognition provisions of Statement of Financial Accounting Standards No. 123, "Accounting for Stock-Based Compensation."

        The above pro forma amounts were based on a Black-Scholes option-pricing model, which included the following information and assumptions:

Deferred taxes — Deferred tax assets and liabilities are recognized for the estimated future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases. The realization of deferred tax assets is assessed periodically based on several interrelated factors. These factors include U. S. Steel's expectation to generate sufficient future taxable income and management's intent regarding the permanent reinvestment of the earnings from certain foreign subsidiaries. Deferred tax liabilities have not been recognized for the undistributed earnings of certain foreign subsidiaries, primarily USSK, because management intends to permanently reinvest such earnings in those foreign operations. U. S. Steel records a valuation allowance to reduce deferred tax assets to the amount that is more likely than not to be realized.

Insurance — U. S. Steel is insured for catastrophic casualty and certain property and business interruption exposures, as well as those risks required to be insured by law or contract. Costs resulting from noninsured losses are charged against income upon occurrence.

Reclassifications — Effective January 1, 2002, net pension and other postretirement costs associated with active employees at our operating locations are reflected in cost of revenues. Net costs and credits associated with corporate headquarters personnel and all retirees are reflected in selling, general and administrative expenses. Prior year data has been reclassified to conform to the current year presentation, which resulted in a decrease in cost of revenues and an increase in selling, general and administrative expenses of $162 million and $190 million for the years ended December 31, 2001 and 2000, respectively. Certain other reclassifications of prior years' data have been made to conform to 2002 classifications.

F-12

4. New Accounting Standards

On January 1, 2002, U. S. Steel adopted Statement of Financial Accounting Standards (SFAS) No. 141 "Business Combinations." SFAS No. 141 requires that all business combinations be accounted for under the purchase method of accounting and established specific criteria for the recognition of intangible assets separately from goodwill. This Statement also requires that if any excess of fair value of acquired assets over cost in a business combination remains after reducing to zero amounts that would have otherwise been assigned to the acquired assets, that remaining excess shall be recognized immediately as an extraordinary gain, rather than being deferred and amortized. There was no financial statement impact related to the initial adoption of SFAS No. 141 and the guidance will be applied on a prospective basis.

        On January 1, 2002, U. S. Steel adopted SFAS No. 142 "Goodwill and Other Intangible Assets" which addresses the accounting for goodwill and other intangible assets after an acquisition. The most significant changes made by SFAS No. 142 are that 1) goodwill and intangible assets with indefinite lives will no longer be amortized, but must be tested for impairment at least annually; and 2) the amortization period for intangible assets with finite lives will no longer be limited to forty years. SFAS No. 142 requires transitional disclosure of what reported net income and the associated per share amount would have been in all periods presented had SFAS No. 142 been in effect. There was no impact to net income or the related per share amount for any period presented in the financial statements.

        Also adopted on January 1, 2002, was SFAS No. 144 "Accounting for Impairment or Disposal of Long-Lived Assets." This Statement establishes a single accounting model for long-lived assets to be disposed of by sale and provides additional guidance on assets to be held and used and assets to be disposed of other than by sale. There was no financial statement impact related to the initial adoption of this Statement.

        On April 30, 2002, the Financial Accounting Standards Board (FASB) issued SFAS No. 145, "Rescission of FASB Statements No. 4, 44, and 64, Amendment of FASB Statement No. 13, and Technical Corrections." SFAS No. 145 rescinds SFAS No. 4, "Reporting Gains and Losses from the Extinguishment of Debt," and the criteria in Accounting Principles Board Opinion No. 30, "Reporting the Results of Operations — Reporting the Effects of Disposal of a Segment of a Business, and Extraordinary, Unusual and Infrequently Occurring Events and Transactions" will now be used to classify gains and losses on the extinguishment of debt. SFAS No. 64, "Extinguishments of Debt Made to Satisfy Sinking Fund Requirements" amended SFAS No. 4 and is no longer necessary because SFAS No. 4 has been rescinded. SFAS No. 44, "Accounting for Intangible Assets of Motor Carriers" did not apply to U. S. Steel. SFAS No. 13, "Accounting for Leases" is amended to require certain lease modifications that have economic effects similar to sale-leaseback transactions to be accounted for in the same manner as sale-leaseback transactions. SFAS No. 145 also makes technical corrections to existing pronouncements. While these corrections are not substantive in nature, in some instances, they may change accounting practice. Generally, SFAS No. 145 is effective for fiscal years beginning after May 15, 2002, except for certain provisions related to SFAS No. 13 that are effective for transactions occurring after May 15, 2002. The provisions of SFAS No. 145 related to the rescission of SFAS No. 4 will have no impact on net income or the related per share amount for any period presented in the financial statements.

        In June 2001, the FASB issued SFAS No. 143 "Accounting for Asset Retirement Obligations." SFAS No. 143 establishes a new accounting model for the recognition and measurement of retirement obligations associated with tangible long-lived assets. SFAS No. 143 requires that an asset retirement obligation be capitalized as part of the cost of the related long-lived asset and subsequently allocated to expense using a systematic and rational method. SFAS No. 143 requires proforma disclosure of the amount of the liability for obligations as if the statement had been applied during all periods affected,

F-13

using current information, current assumptions and current interest rates. In addition, the effect of adopting a new accounting principle on net income and on the related per share amounts is required to be shown on the face of the income statements for all periods presented under APB Opinion No. 20. U. S. Steel adopted this Statement effective January 1, 2003. The transition adjustment of less than $15 million, net of tax, resulting from the adoption of SFAS No. 143 will be reported as a cumulative effect of a change in accounting principle in the first quarter of 2003. U. S. Steel will comply with the proforma disclosure requirements.

        SFAS No. 146, "Accounting for Costs Associated with Exit or Disposal Activities" was issued in July 2002. SFAS No. 146 addresses significant issues regarding the recognition, measurement and reporting of costs that are associated with exit and disposal activities, including restructuring activities. The scope of SFAS No. 146 includes (1) costs to terminate contracts that are not capital leases; (2) costs to consolidate facilities or relocate employees; and (3) termination benefits provided to employees who are involuntarily terminated under the terms of a one-time benefit arrangement that is not an ongoing benefit arrangement or an individual deferred-compensation contract. The provisions of this Statement will be effective for exit or disposal activities initiated after December 31, 2002.

        In November 2002, the FASB issued Interpretation No. 45, "Guarantor's Accounting and Disclosure Requirements for Guarantees, Including Indirect Guarantees of Indebtedness of Others." The Interpretation elaborates on the disclosure to be made by a guarantor about obligations under certain guarantees that it has issued. It also clarifies that at the inception of a guarantee, the company must recognize liability for the fair value of the obligation undertaken in issuing the guarantee. The initial recognition and measurement provisions apply on a prospective basis to guarantees issued or modified after December 31, 2002. The disclosure requirements have been adopted for the 2002 annual financial statements (see Note 25). U. S. Steel will apply the remaining provisions of the Interpretation prospectively as required.

        In December 2002, the FASB issued SFAS No. 148, "Accounting for Stock-Based Compensation — Transition and Disclosure," which amends SFAS No. 123. SFAS No. 148 provides alternative methods of transition for a voluntary change to the fair value based method of accounting for stock-based employee compensation. In addition, SFAS No. 148 amends the disclosure requirements of SFAS No. 123 to require more prominent and more frequent disclosures in financial statements about the effects of stock-based compensation. The Company has adopted the annual disclosure provisions and will adopt the interim disclosure provisions of SFAS No. 148 effective with the first quarter of 2003. The Company is not changing to the fair value based method of accounting for stock-based employee compensation; therefore, the transition provisions are not applicable.

        FASB Interpretation No. 46, "Consolidation of Variable Interest Entities," was issued in January 2003 and addresses consolidation by business enterprises of variable interest entities that do not have sufficient equity investment to permit the entity to finance its activities without additional subordinated financial support from other parties or whose equity investors lack the characteristics of a controlling financial interest. This Interpretation requires consolidation of a variable interest entity by the primary beneficiary and requires certain disclosures by the primary and other significant beneficiaries. The provisions of this Interpretation apply immediately to variable interest entities created after January 31, 2003, and to variable interest entities in which a company obtains an interest after that date. It applies for the interim period beginning after June 15, 2003, for variable interest entities in which a company holds a variable interest that it acquired before February 1, 2003. The Interpretation may be applied prospectively with a cumulative effect adjustment as of the date of first application or by restating previously issued financial statements for one or more years with a cumulative-effect adjustment as of the beginning of the first year restated. If it is reasonably possible that an enterprise will consolidate or disclose information about a variable interest entity when this Interpretation becomes effective, the company must make certain disclosures in all financial

F-14

statements initially issued after January 31, 2003, regardless of the date on which the variable interest entity was created. U. S. Steel is in the process of assessing the appropriate application of this Interpretation.

5. Business Combinations

On November 24, 2000, U. S. Steel acquired USSK. USSK was formed in June 2000 to hold the steel operations and related assets of VSZ a.s. (VSZ), a diversified Slovak corporation. The purchase price for USSK consisted of cash payments of $69 million in 2000, $14 million in 2001 and additional consideration of not less than $25 million and up to $75 million was contingent upon the performance of USSK in 2001. Based on this performance, the maximum contingent consideration was accrued, resulting in total cash consideration of $158 million. In July 2002, the first installment of the contingent consideration of $37.5 million was paid. The remaining payment of $37.5 million is due in July 2003. Additionally, $325 million of debt and $226 million of other liabilities were included with the acquisition. The acquisition was accounted for under the purchase method of accounting. The 2000 results of operations included the operations of USSK from the date of acquisition. Prior to this transaction, U. S. Steel and VSZ were equal partners in VSZ U. S. Steel, s.r.o. (VSZUSS), a tin mill products manufacturer. The assets of USSK included VSZ's interest in VSZUSS. The acquisition of the remaining interest in VSZUSS was accounted for under the purchase method of accounting. Prior to the acquisition, U. S. Steel had accounted for its investment in VSZUSS under the equity method of accounting.

        On March 1, 2001, U. S. Steel completed the purchase of the tin mill products business of LTV Corporation (LTV), which is now operated as East Chicago Tin. In this noncash transaction, U. S. Steel assumed approximately $66 million of employee related obligations from LTV. The acquisition was accounted for using the purchase method of accounting. Results of operations for the year 2001 include the operations of East Chicago Tin from the date of acquisition. In the fourth quarter of 2001, U. S. Steel recorded an intangible asset impairment of $20 million, related to the five-year agreement for LTV to supply U. S. Steel with pickled hot bands entered into in conjunction with the acquisition of LTV's tin mill products business. This impairment was recorded during the quarter that LTV discontinued operations at East Chicago pursuant to a bankruptcy court order.

        On March 23, 2001, Transtar, Inc. (Transtar) completed a reorganization with its two voting shareholders, U. S. Steel and Transtar Holdings, L.P. (Holdings), an affiliate of Blackstone Capital Partners L.P. As a result of this transaction, U. S. Steel became sole owner of Transtar and certain of its subsidiaries. Holdings became owner of the other subsidiaries of Transtar. Because the reorganization involved the sale of certain subsidiaries to Holdings, a noncontrolling shareholder, Transtar recorded a gain by comparing the carrying value of the businesses sold to their fair value. U. S. Steel's share of the gain recognized by Transtar was $68 million, which is included in income (loss) from investees. Concurrently, U. S. Steel accounted for the change in ownership of Transtar using the step-acquisition purchase method of accounting. Also, in connection with this transaction, U. S. Steel recognized a favorable deferred tax adjustment of $33 million related to its investment in the stock of Transtar that was no longer required when U. S. Steel acquired 100 percent of Transtar. U. S. Steel previously accounted for its investment in Transtar under the equity method of accounting.

        The following unaudited pro forma data for U. S. Steel includes the results of operations of the above acquisitions giving effect to them as if they had been consummated at the beginning of the years presented. Pro forma results for 2001 exclude the $68 million gain and the $33 million tax benefit recorded as a result of the Transtar transaction. In addition, VSZ did not provide historical carve-out financial information for its steel activities prepared in accordance with generally accepted accounting principles in the United States of America. Therefore, U. S. Steel made certain estimates and assumptions regarding revenues and costs used in the preparation of the unaudited pro forma data relating to USSK for the year 2000.

F-15

        The following unaudited pro forma data is based on historical information and does not necessarily reflect the actual results that would have occurred nor is it necessarily indicative of future results of operations.

6. Net Interest and Other Financial Costs

^(a)

Includes a favorable adjustment of $67 million related to prior years' taxes.

7. Recovery of Excise Taxes

In 2002, U. S. Steel recognized pretax income of $38 million associated with the recovery of black lung excise taxes that were paid on coal export sales during the period 1993 through 1999. This income is included in other income in the statement of operations and resulted from a 1998 federal district court decision that found such taxes to be unconstitutional. Of the $38 million of cash received, $11 million represented interest.

F-16

8. Segment Information

During the first quarter of 2002, following the Separation, U. S. Steel established a new internal financial reporting structure. This resulted in a change in reportable segments from Domestic Steel and USSK to Flat-rolled Products (Flat-rolled), Tubular Products (Tubular) and USSK. In addition, U. S. Steel revised the presentation of several items of income and expense within income (loss) from reportable segments. Net pension credits, costs related to former businesses and administrative expenses previously not reported at the segment level are now directly charged or allocated to the reportable segments and other businesses. In the fourth quarter of 2002, certain quantitative threshold tests under SFAS No. 131 were met by two operating units previously included in the Other Businesses category, Straightline Source (Straightline) and USS Real Estate (Real Estate), requiring those operating units to be reflected as reportable segments. Effective with the third quarter of 2003, the composition of the Flat-rolled segment was changed to include the results of the coke operations at Clairton Works and Gary Works, which were previously reported in Other Businesses. This change reflected U. S. Steel's recent management consolidations. Also, on September 12, 2003, U. S. Steel Balkan d.o.o., a wholly owned subsidiary of U. S. Steel, acquired out of bankruptcy Sartid a.d. (In Bankruptcy) and certain of its subsidiaries. Effective with this acquisition, the USSK segment was renamed U. S. Steel Europe (USSE). Prior year segment data has been conformed to the current presentation.

        The Flat-rolled segment includes the operating results of U. S. Steel's domestic integrated steel mills and equity investees involved in the production of sheet, plate and tin mill products, as well as all domestic coke production facilities. These operations are principally located in the United States and primarily serve customers in the transportation (including automotive), appliance, service center, conversion, container and construction markets.

        The Tubular segment includes the operating results of U. S. Steel's domestic tubular production facilities and an equity investee involved in the production of tubular goods. These operations produce and sell both seamless and electric resistance weld tubular products and primarily serve customers in the oil, gas and petrochemical markets.

        The USSE segment includes the operating results of U. S. Steel's integrated steel mill located in the Slovak Republic; a production facility in Germany; operations under facility management and support agreements in Serbia; and equity investees, primarily located in Central Europe. These operations produce and sell sheet, plate, tin, tubular, precision tube and specialty steel products, as well as coke. USSE primarily serves customers in the central and western European construction, conversion, appliance, transportation, service center, container, and oil, gas and petrochemical markets.

        The Straightline segment includes the operating results of U. S. Steel's technology-enabled distribution business that serves steel customers primarily in the eastern and central United States. Straightline competes in the steel service center marketplace using a nontraditional business process to sell, process and deliver flat-rolled steel products in small to medium sized order quantities primarily to job shops, contract manufacturers and original equipment manufacturers across an array of industries.

        The Real Estate segment manages U. S. Steel's domestic mineral interests that are not assigned to other operating units; timber properties; and residential, commercial and industrial real estate that is managed or developed for sale or lease.

        All other U. S. Steel businesses not included in U. S. Steel's reportable segments are reflected in Other Businesses. These businesses are involved in the production and sale of coal and taconite pellets (iron ore); transportation services; and engineering and consulting services.

        The chief operating decision maker evaluates performance and determines resource allocations based on a number of factors, the primary measure being income (loss) from operations. Income (loss) from operations for reportable segments and other businesses does not include net interest and other

F-17

financial costs, the income tax provision (benefit), or special items. Information on segment assets is not disclosed as it is not reviewed by the chief operating decision maker.

        The accounting principles applied at the operating segment level in determining income (loss) from operations are generally the same as those applied at the consolidated financial statement level. Intersegment sales and transfers for some operations are accounted for at cost, while others are accounted for at market-based prices, and are eliminated at the corporate consolidation level. All corporate-level selling, general and administrative expenses and costs related to certain former businesses are allocated to the reportable segments and other businesses based on measures of activity that management believes are reasonable.

        The results of segment operations are as follows: