UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 11-K ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 (Mark one) o ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE FISCAL YEAR ENDED DECEMBER 31, 2002 [ ] Transition report pursuant to Section 15(d) of the Securities Exchange Act of 1934. For the transition period from _______ to _______ Commission File Number 001-12209 A. Full title of the plan and address of the plan, if different from the issuer named below RANGE RESOURCES CORPORATION 401(k) PLAN B. Name of issuer of the securities held pursuant to the plan and address of its principle executive office RANGE RESOURCES CORPORATION 777 MAIN STREET, FORT WORTH, TEXAS, 76012

Table of Contents

Report of Independent Auditors ....................................... F-1 Audited Financial Statements Statements of Net Assets Available for Benefits .................................... F-2 Statements of Changes in Net Assests Available for Benefits ............................ F-3 Notes to Financial Statements ................................ F-4 Supplemental Schedule - Form 5500 Schedule H line 4i - Schedule of Assests Held for Investment Purposes at End of Year ................................... F-11 Signatures ........................................................... F-12 Exhibit Index ........................................................ F-13 Exhibit 23 - Consent of Independent Auditors ......................... F-14 Exhibit 99.1 - Certification of Periodic Reports ..................... F-15

REPORT OF INDEPENDENT AUDITORS To the Administrative Committee of Range Resources Corporation 401(k) Plan We have audited the accompanying statements of net assets available for benefits of Range Resources Corporation 401(k) Plan (the "Plan") as of December 31, 2002 and 2001 and the related statements of changes in net assets available for benefits for the years then ended. These financial statements are the responsibility of the Plan's management. Our responsibility is to express an opinion on these financial statements based on our audits. We conducted our audits in accordance with auditing standards generally accepted in the United States of America. Those standards 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. An audit also includes assessing the accounting principles used and significant estimates made by management, as well as evaluating the overall financial statement presentation. We believe that our audits provide a reasonable basis for our opinion. In our opinion, based on our audits, the financial statements referred to above present fairly, in all material respects, the net assets available for benefits of the Plan as of December 31, 2002 and 2001, and the changes in its net assets available for benefits for the years then ended in conformity with accounting principles generally accepted in the United States of America. Our audit was conducted for the purposes of forming an opinion on the basic financial statements taken as a whole. The supplemental schedule of assets held for investment purposes at end of year as of December 31, 2002 is presented for the purposes of additional analysis and is not a required part of the basic financial statements but is supplementary information required by the Department of Labor's Rules and Regulations for Reporting and Disclosure under the Employee Retirement Income Security Act of 1974 ("ERISA"). This supplemental schedule is the responsibility of the Plan's management. The supplemental schedule has been subjected to the auditing procedures applied in the audit of the basic financial statements and, in our opinion, is fairly stated in all material respects in relation to the basic financial statements taken as a whole. /s/ Whitley Penn - ----------------- Fort Worth, Texas May 16, 2003 F-1

RANGE RESOURCES CORPORATION 401(k) PLAN STATEMENTS OF NET ASSETS AVAILABLE FOR BENEFITS

DECEMBER 31, ------------------------- 2002 2001 ---------- ---------- ASSETS Investments, at fair value: Shares of registered investment companies: Mutual Funds $2,988,099 $2,538,154 Range Resources Common Stock 2,514,532 1,338,107 Participant loans 209,088 117,648 ---------- ---------- 5,711,719 3,993,909 Receivables Employer's -- 554,243 Participants' -- 1,357 Investment income -- 253 ---------- ---------- -- 555,853 Total assets 5,711,719 4,549,762 ---------- ---------- Liabilities -- -- ---------- ---------- Net assets available for benefits $5,711,719 $4,549,762 ========== ==========
See accompanying notes to the financial statements. F-2

RANGE RESOURCES CORPORATION 401(k) PLAN STATEMENTS OF CHANGES IN NET ASSETS AVAILABLE FOR PLAN BENEFITS

YEARS ENDED DECEMBER 31, ----------- ----------- 2002 2001 ----------- ----------- Additions to net assets attributed to: Investment Income: Net realized and unrealized loss on investments $ (169,906) $(1,043,873) Interest and dividends 53,313 60,003 ----------- ----------- (116,593) (983,870) Contributions: Non cash: Employer stock 601,500 554,243 Cash: Participant 643,570 660,573 Rollover -- 39,948 Transfer from qualified plan 425,408 -- ----------- ----------- 1,670,478 1,254,764 ----------- ----------- Total additions 1,553,885 270,894 Deductions from assets attributed to: Benefits paid to participants 391,928 562,110 ----------- ----------- Total deductions 391,928 562,110 ----------- ----------- Net increase (decrease) 1,161,957 (291,216) Net assets available for benefits at beginning of year 4,549,762 4,840,978 ----------- ----------- Net assets available for benefits at end of year $ 5,711,719 $ 4,549,762 =========== ===========
See accompanying notes to the financial statements. F-3

RANGE RESOURCES CORPORATION 401(k) PLAN NOTES TO FINANCIAL STATEMENTS DECEMBER 31, 2002 AND 2001 A. DESCRIPTION OF PLAN PLAN DESCRIPTION The following description of the Range Resources Corporation 401(k) Plan (the "Plan") provides only general information. The Plan is sponsored by Range Resources Corporation (the "Company"). Participants should refer to the Plan agreement for a more complete description of the Plan's provisions. GENERAL The Plan is a defined contribution plan covering employees of the Company who are eighteen years of age or older. The Plan is subject to the provisions of the Employee Retirement Income Security Act of 1974 ("ERISA"). The Plan was restated January 1, 2001, when the Plan adopted the prototype plan provided by CPI Qualified Plan Consultants as a substitution and amendment of an existing retirement plan originally established January 1, 1989. The Plan was restated again effective January 1, 2002, refer to Footnote H. The purpose of the Plan is to encourage employees to save and invest, systematically, a portion of their current compensation in order that they may have a source of additional income upon their retirement, or for their family in the event of death. CONTRIBUTIONS Participants may contribute up to 50% of pre-tax annual compensation, as defined by the Plan. Contributions are subject to limitations on annual additions and other limitations imposed by the Internal Revenue Code as defined in the Plan Agreement. Integrated Contributions are equal to 5.70% of each active participant's eligible compensation in excess of the social security taxable wage base in 2002 and 2001. Participants must be employed on the last day of the plan year, and complete 1,000 hours of service during the plan year to be eligible to receive profit sharing contributions. Each year the Board of Directors determines the percentage of employee salaries that the Company will contribute as a profit sharing contribution. In 2002 and 2001, the Company made profit sharing contributions, the form of Company stock, at the rate of 6% of an eligible participant's salary. At the discretion of the Board of Directors, the Company may elect to contribute a matching contribution based on the amounts of salary reduction of the participants. No matching contribution was made in 2002 or 2001. F-4

RANGE RESOURCES CORPORATION 401(k) PLAN NOTES TO FINANCIAL STATEMENTS (CONTINUED) A. DESCRIPTION OF PLAN - CONTINUED PARTICIPANT ACCOUNTS Each participant's account is credited with the participant's elective contribution, employer contribution(s), and earnings thereon. Allocations are based on participant earnings or account balances as defined in the Plan. The benefit to which a participant is entitled is the benefit that can be provided from the participant's vested account. VESTING Participants are immediately fully vested in their elective contributions plus actual earnings thereon. Vesting in the Company contribution portion of accounts plus actual earnings thereon is as follows: VESTED YEARS OF SERVICE PERCENTAGE -------------------------------- -------------------- Less than One (1) year 0% One (1) year 40% Two (2) years 80% Three (3) or more years 100% A year of service for vesting purposes is defined as a period in which a participant completes at least 1,000 hours of service. LOANS Participants may borrow from their fund accounts up to a maximum equal to the lesser of $50,000 or 50% of their vested account balance. Loan terms range from one to five years or, in the case of a loan to acquire or construct the primary residence of a participant, a period not to exceed a repayment period used by commercial lenders for similar loans. The loans are secured by the balance in the participant's account and bear interest at the prime rate plus 2%, as defined by the Participant Loan Program. Principal and interest are paid ratably through payroll deductions. BENEFIT PAYMENTS Participants withdrawing during the year for reasons of service or disability, retirement, death, or termination are entitled to their vested account balance. Benefits are distributed in the form of rollovers, lump sums, installment payments, or through the purchase of an annuity contract. If withdrawing participants are not entitled to their entire account balance, the amounts not received are forfeited and reallocated to the remaining participants once it is assured that a break in service was incurred by the withdrawing participant. Disbursements for benefits are recorded when paid. F-5

RANGE RESOURCES CORPORATION 401(k) PLAN NOTES TO FINANCIAL STATEMENTS (CONTINUED) A. DESCRIPTION OF PLAN - CONTINUED FORFEITURES Forfeited balances of terminated participants' non-vested accounts are reallocated to the account balances of the remaining participants. ADMINISTRATIVE EXPENSES The Plan Sponsor pays administrative expenses of the Plan. During 2002 and 2001, the Plan Sponsor paid approximately $10,100 and $12,000, respectively, of Plan expenses on behalf of the Plan. B. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES BASIS OF ACCOUNTING The financial statements of the Plan are presented on the accrual basis of accounting in accordance with accounting principles generally accepted in the United States of America. USE OF ESTIMATES The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America, requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the reporting period. Actual results could differ from those estimates. INVESTMENTS Investments are valued at fair market value. The Common Stock of Range Resources Corporation 401(k) Plan is valued at the last reported sales price on the last business day of the plan year. Purchases and sales of securities are recorded on a trade-date basis. Interest income is recorded on the accrual basis. Net realized gain or loss on investments is the difference between the proceeds received upon the sale of investments and the market value of investments as of the end of the preceding year or the average cost of those assets if acquired during the current year. Unrealized appreciation or depreciation of investments represents the increase or decrease in market value during the year. These investments are subject to market or credit risks customarily associated with equity investments. F-6

RANGE RESOURCES CORPORATION 401(k) PLAN NOTES TO FINANCIAL STATEMENTS (CONTINUED) B. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES- CONTINUED CONTRIBUTIONS Contributions from the participants and the employer are accrued in the period in which they are deducted in accordance with salary deferral agreements and as they become obligations of the Company, as determined by the Plan's administrator. PAYMENT OF BENEFITS Benefits are recorded when paid. PLAN EXPENSES Employees of the Company perform certain administrative functions with no compensation from the Plan. Administrative costs of the Plan are paid by the Company and are not reflected in the accompanying financial statements. C. INVESTMENTS Participants may direct their 401(k) salary deferrals to be invested into any of the nine investment funds offered by the Plan as well as the Range Resources Corporation common stock. Non-cash profit sharing contributions made in the form of the Company's commons stock, by the Company, can be redirected by participants into any of the nine investment options offered by the Plan. The following table presents the individual investments that exceeded 5% of the Plan's net assets available for benefits at December 31,:

DESCRIPTION 2002 2001 ----------------------------------------- ---------- ---------- AIM Cash Reserves $ 403,958 $ 269,630 Bond Fund of America 307,029 211,417 Investment Co of America 590,511 566,880 AIM Balanced 465,789 507,252 AIM Blue Chip 491,063 486,698 Range Resources Common Stock (463,241 and 412,552 shares, respectively) 2,514,532 1,338,107
Range Resources common stock represents approximately 44% and 34% of total net assets available for benefits at December 31, 2002 and 2001, respectively. F-7

RANGE RESOURCES CORPORATION 401(k) PLAN NOTES TO FINANCIAL STATEMENTS (CONTINUED) D. TAX STATUS The Plan has received a determination letter from the Internal Revenue Service dated August 2, 2002, stating that the Plan is qualified under Section 401(a) of the Internal Revenue Code (the Code) and, therefore, the related trust is exempt from federal income taxation. Once qualified, the Plan is required to operate in conformity with the Code to maintain its qualification. The Plan Sponsor believes the Plan is being operated, in compliance with the applicable requirements of the Code and, therefore, believes that the Plan is qualified and the related trust is tax exempt. E. FORFEITURES At December 31, 2002 and 2001, the balance in the forfeiture account approximated $3,300 and $13,300, respectively. Forfeitures reallocated to participants in 2002 totaled approximately $13,300. F. TRANSACTIONS WITH PARTIES IN INTEREST Participants have the option to invest their salary deferrals into the common stock of Range Resources Corporation, the Plan Sponsor. G. PLAN TERMINATION Although it has not expressed any intent to do so, the Company has the right to terminate the Plan at any time, subject to the provisions of ERISA. In the event of such termination of the Plan, participants would become fully vested and the net assets of the Plan would be distributed among the participants in accordance with ERISA. H. PLAN AMENDMENT Effective January 1, 2002, the Plan was amended and restated ("Plan Amendment") and the definition of compensation as it relates to the Plan was changed. The definition of compensation was modified to exclude all bonuses and amounts taxed to employees in connection with purchases of discounted stocks. The Plan was amended to exclude temporary employees as eligible employees to the Plan. The Plan was amended to increase participant contributions to 50% of pre-tax annual compensation, as defined by the Plan. F-8

RANGE RESOURCES CORPORATION 401(k) PLAN NOTES TO FINANCIAL STATEMENTS (CONTINUED) I. PLAN MERGER In 1998, Lomak Petroleum, Inc. acquired Domain Energy Corporation ("Domain") via merger and changed the resulting company's name to Range Resources Corporation. The Plan was amended to allow Domain employees to be eligible for the Plan, and the Range Energy Ventures Corporation 401(k) Plan ("Domain Plan") assets were frozen. On March 14, 2002, Domain received a favorable letter of determination relating to tax qualification status of the Domain Plan prior to merging the Domain Plan with the Plan. During July 2002, the Company merged Domain Plan's net assets of $425,400 into the Plan. These net assets have been recorded as a "Transfer From Qualified Plan" in the accompany Statements of Changes In Net Assets Available For Benefits. J. SUBSEQUENT EVENTS Effective January 1, 2003, the assets of the Plan were transferred from Matrix Capital Bank Trust Services to Scudder Trust Company ("Scudder"). As a result of this transfer, Scudder also assumed the responsibility of trustee and record keeper, which was formerly held by CPI Qualified Plan Consultants, Inc. F-9

SUPPLEMENTAL SCHEDULE F-10

RANGE RESOURCES CORPORATION 401(k) PLAN FORM 5500, SCHEDULE H, LINE 4I- SCHEDULE OF ASSETS HELD FOR INVESTMENT PURPOSES AT END OF YEAR DECEMBER 31, 2002

EIN: 34-1312571 PLAN: 002 (c) (d) (e) (b) DESCRIPTION CURRENT (a) IDENTITY OF ISSUE OF INVESTMENTS COST VALUE - --------- ---------------------------- -------------- --------- --------------- AIM Cash Reserves Mutual Fund - $ 403,958 Bond Fund of America Mutual Fund - 307,029 Investment Co of America Mutual Fund - 590,511 AIM Balanced Mutual Fund - 465,789 AIM Blue Chip Mutual Fund - 491,063 AIM Constellation Mutual Fund - 225,758 AIM Aggressive Growth Mutual Fund - 231,852 AIM International Equity Mutual Fund - 72,285 OPP Global Mutual Fund - 151,871 AIM Mid Cap Basic Value Mutual Fund - 47,983 * Range Resources Common Stock Common Stock - 2,514,532 * Participant Loans Prime rate - 209,088 --------------- $ 5,711,719 ===============
* Party In Interest F-11

SIGNATURE The Plan. Pursuant to the requirements of the Securities Exchange Act of 1934, the trustee has duly caused this annual report to be signed on their behalf by the undersigned hereunto duly authorized. RANGE RESOURCES CORPORATION 401(k) PLAN Date: June 26, 2003 /s/ Rodney L. Waller ------------------------- Rodney L. Waller, Trustee F-12

EXHIBIT INDEX

NUMBER Exhibit - ------ ----------- 23* Consent of independent accountants 99.1* Certification of the December 31, 2002 Annual Report on Form 11-K, pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, by the Principal Executive Officer and Principal Financial Officer of the Plan.
* included herewith F-13

EXHIBIT 23 CONSENT OF INDEPENDENT ACCOUNTANT We consent to the inclusion in the Form 11-K of our report dated May 16, 2003, on the audit of the financial statements of the Range Resources Corporation 401(k) Plan as of December 31, 2002 and for the year then ended, and for the supplemental schedule as of and for the year ended December 31, 2002. /s/ Whitley Penn - ------------------ Fort Worth, Texas May 16, 2003 F-14

EXHIBIT 99.1 Certification of Periodic Financial Reports The undersigned officer of Range Resources Corporation or its subsidiaries, does hereby certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that: (1) the Annual Report on Form 11-K for the fiscal year ended December 31, 2002 (the "Periodic Report") of the Range Resources Corporation 401(K) Plan (the "Plan") which this statement accompanies fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 (15 U.S.C. 78m or 78o(d); and (2) information contained in the Periodic Report fairly presents, in all material respects, the financial condition and results of operations of the Plan. Dated: June 26, 20036 /s/ Rodney L. Waller ----------------------- Rodney L. Waller Senior Vice President F-15