SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 11-K X ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT - ----- OF 1934 (FEE REQUIRED) For the Fiscal Year ending December 31, 1998 OR TRANSITION REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES - ----- EXCHANGE ACT OF 1934 (NO FEE REQUIRED) Commission File Number 0-22650 PETROCORP INCORPORATED 401(K) RETIREMENT SAVINGS PLAN (Full title of the plan) PETROCORP INCORPORATED 16800 Greenspoint Park Drive Suite 300, North Atrium Houston, Texas 77060-2391 (Name of Issuer of the Securities Held Pursuant to the Plan and Address of Principal Executive Offices) Registrant's Telephone Number, Including Area Code: (281) 875-2500 PETROCORP INCORPORATED 401(K) RETIREMENT SAVINGS PLAN TABLE OF CONTENTS ----------------- PAGE NO. ------------ REPORT OF INDEPENDENT ACCOUNTANTS (Not required -- see Note 2.) FINANCIAL STATEMENTS: Statement of Net Assets Available for Benefits with Fund Information as of December 31, 1998 and 1997 2 Statement of Changes in Net Assets Available for Benefits with Fund Information for the years ended December 31, 1998 and 1997 3 Notes to Financial Statements 4 SUPPLEMENTAL SCHEDULES: Item 27a - Schedule of Assets Held for Investment (Not required -- see Note 2.) Item 27d - Schedule of Reportable Transactions (Not required -- see Note 2.) SIGNATURES 9 PetroCorp Incorporated 401(k) Retirement Savings Plan Statement of Net Assets Available for Benefits with Fund Information (Unaudited) December 31, 1998 ---------------------------------------------------------------------------- Assets ---------------------------------------------------------------------------- Investments, at fair value ---------------------------------------------------------------------------- Pooled Participant separate Common notes accounts stock receivable Total ------------------ ---------------- ----------------- ------------------ Principal Investments: Guaranteed Interest Accounts $ - $ - $ - $ - Money Market Account 124,532 - - 124,532 Government Securities Account 255,653 - - 255,653 Bond & Mortgage Account 101,513 - - 101,513 Bond Emphasis Balanced Account 55,191 - - 55,191 Stock Emphasis Balanced Account 141,783 - - 141,783 Stock Index 500 Account 365,444 - - 365,444 U.S. Stock Account 321,043 - - 321,043 Medium Company Value Account 237,234 - - 237,234 Small Company Blend Account 399,349 - - 399,349 Medium Company Blend Account 201,303 - - 201,303 International Stock Account 224,063 - - 224,063 Real Estate Account 9,759 - - 9,759 Company Stock - 384,857 - 384,857 Participant Notes - - 53,798 53,798 =========== ============= ============= ============= $ 2,436,867 $ 384,857 $ 53,798 $ 2,875,522 =========== ============= ============= ============= December 31, 1998 -------------------------------------------------------------------------------------------- Assets ------------------------------------------------------- Guaranteed investment Net assets contract, at available for contract value Cash Total Liabilities benefits ---------------- --------------- ------------------ --------------- ------------------ Principal Investments: Guaranteed Interest Accounts $ 100,775 $ - $ 100,775 $ - $ 100,775 Money Market Account - - 124,532 - 124,532 Government Securities Account - - 255,653 - 255,653 Bond & Mortgage Account - - 101,513 - 101,513 Bond Emphasis Balanced Account - - 55,191 - 55,191 Stock Emphasis Balanced Account - - 141,783 - 141,783 Stock Index 500 Account - - 365,444 - 365,444 U.S. Stock Account - - 321,043 - 321,043 Medium Company Value Account - - 237,234 - 237,234 Small Company Blend Account - - 399,349 - 399,349 Medium Company Blend Account - - 201,303 - 201,303 International Stock Account - - 224,063 - 224,063 Real Estate Account - - 9,759 - 9,759 Company Stock - - 384,857 - 384,857 Participant Notes - - 53,798 - 53,798 ========= =============== ================== =============== ================== $ 100,775 $ - $ 2,976,297 $ - $ 2,976,297 ========= =============== ================== =============== ================== December 31, 1997 ------------------------------------------------------------------------------------- Assets ------------------------------------------------------------------------------------- Investments, at fair value ---------------------------------------------------------------------------- Pooled Participant separate Common notes accounts stock receivable Total ------------------ ---------------- ----------------- ------------------ Principal Investments: Guaranteed Interest Accounts $ - $ - $ - $ - Money Market Account 107,100 - - 107,100 Government Securities Account 170,099 - - 170,099 Bond & Mortgage Account 96,881 - - 96,881 Bond Emphasis Balanced Account 54,176 - - 54,176 Stock Emphasis Balanced Account 152,622 - - 152,622 Stock Index 500 Account 154,307 - - 154,307 U.S. Stock Account 270,414 - - 270,414 Medium Company Value Account 221,691 - - 221,691 Small Company Blend Account 489,427 - - 489,427 Medium Company Blend Account 154,028 - - 154,028 International Stock Account 197,150 - - 197,150 Real Estate Account 3,635 - - 3,635 Company Stock - 490,751 - 490,751 Participant Notes - - 60,500 60,500 ============= ================ ================= ============= $ 2,071,530 $ 490,751 $ 60,500 $ 2,622,781 ============= ================ ================= ============= December 31, 1997 ------------------------------------------------------------------------------------------------ Assets ------------------------------------------------------- Guaranteed investment Net assets contract, at available for contract value Cash Total Liabilities benefits ---------------- --------------- ------------------ --------------- ------------------ Principal Investments: Guaranteed Interest Accounts $ 137,258 $ - $ 137,258 $ - $ 137,258 Money Market Account - - 107,100 - 107,100 Government Securities Account - - 170,099 - 170,099 Bond & Mortgage Account - - 96,881 - 96,881 Bond Emphasis Balanced Account - - 54,176 - 54,176 Stock Emphasis Balanced Account - - 152,622 - 152,622 Stock Index 500 Account - - 154,307 - 154,307 U.S. Stock Account - - 270,414 - 270,414 Medium Company Value Account - - 221,691 - 221,691 Small Company Blend Account - - 489,427 - 489,427 Medium Company Blend Account - - 154,028 - 154,028 International Stock Account - - 197,150 - 197,150 Real Estate Account - - 3,635 - 3,635 Company Stock - - 490,751 - 490,751 Participant Notes - - 60,500 - 60,500 ============ ================ ================= ================== ================ $ 137,258 $ - $ 2,760,039 $ - $ 2,760,039 ============ ================ ================= ================== ================ The accompanying notes are an integral part of these financial statements. 2 PetroCorp Incorporated 401(k) Retirement Savings Plan Statement of Changes in Net Assets Available for Benefits with Fund Information (Unaudited) Year ended December 31, 1998 ------------------------------------------------------------------------------------- Additions ------------------------------------------------------------------------------------- Investment income --------------------------------------------------- Net appreciation (depreciation) in fair value of Contributions investments -------------------------------- Interest (Note 3) Total Employer Participants ------------- ------------------ --------------- --------------- --------------- Principal Investments: Guaranteed Interest Accounts $ 6,559 $ - $ 6,559 $ 5,001 $ 8,930 Money Market Account - 5,060 5,060 342 2,116 Government Securities Account - 15,794 15,794 3,365 7,634 Bond & Mortgage Account - 7,259 7,259 5,121 10,001 Bond Emphasis Balanced Account - 5,077 5,077 2,122 2,351 Stock Emphasis Balanced Account - 16,832 16,832 5,107 14,092 Stock Index 500 Account - 60,877 60,877 25,471 36,232 U.S. Stock Account - 40,152 40,152 19,046 23,553 Medium Company Value Account - 8,696 8,696 13,333 21,966 Small Company Blend Account - (43,349) (43,349) 30,187 40,969 Medium Company Blend Account - 10,976 10,976 16,495 24,602 International Stock Account - 20,985 20,985 17,611 17,586 Real Estate Account - 437 437 593 708 Company Stock - (143,065) (143,065) 48,655 40,546 Participant Notes 6,330 - 6,330 - - ============= ================== =============== =============== =============== $ 12,889 $ 5,731 $ 18,620 $ 192,449 $ 251,286 ============= ================== =============== =============== =============== Year ended December 31, 1998 ------------------------------------------------------------------------------------- Additions --------------------------------- (Deductions) Contributions -------------------------------------------------- --------------- Total Participant Admin. Interfund Total additions benefits expenses transfers --------------- --------------- ----------------- -------------- --------------- Principal Investments: Guaranteed Interest Accounts $ 13,931 $ 20,490 $ (47,686) $ (137) $ (9,150) Money Market Account 2,458 7,518 (17,863) (28) 27,805 Government Securities Account 10,999 26,793 - (53) 58,814 Bond & Mortgage Account 15,122 22,381 (11,495) (46) (6,208) Bond Emphasis Balanced Account 4,473 9,550 (9,932) (48) 1,445 Stock Emphasis Balanced Account 19,199 36,031 (27,468) (72) (19,330) Stock Index 500 Account 61,703 122,580 (11,969) (108) 100,634 U.S. Stock Account 42,599 82,751 (18,027) (82) (14,013) Medium Company Value Account 35,299 43,995 (16,222) (105) (12,125) Small Company Blend Account 71,156 27,807 (22,423) (112) (95,350) Medium Company Blend Account 41,097 52,073 (2,047) (113) (2,638) International Stock Account 35,197 56,182 (27,043) (111) (2,115) Real Estate Account 1,301 1,738 (477) (5) 4,868 Company Stock 89,201 (53,864) (30,909) - (21,121) Participant Notes - 6,330 (1,516) - (11,516) =============== =============== ================= ============== =============== $ 443,735 $ 462,355 $ (245,077) $ (1,020) $ - =============== =============== ================= ============== =============== Year ended December 31, 1998 -------------------------------------------------------------------------------------- (Deductions) --------------- Net assets at Net assets at Total Net Increase beginning of end of deductions (decrease) year year -------------- ------------ -------------- -------------- Principal Investments: Guaranteed Interest Accounts $ (56,973) $ (57,483) $ 137,258 $ 100,775 Money Market Account 9,914 17,432 107,100 124,532 Government Securities Account 58,761 85,554 170,099 259,653 Bond & Mortgage Account (17,749) 4,632 96,881 101,513 Bond Emphasis Balanced Account (8,535) 1,015 54,176 55,191 Stock Emphasis Balanced Account (46,870) (10,839) 152,622 141,783 Stock Index 500 Account 88,557 211,137 154,307 365,444 U.S. Stock Account (32,122) 50,629 270,414 321,843 Medium Company Value Account (28,452) 15,543 221,691 237,234 Small Company Blend Account (117,885) (90,078) 489,427 399,349 Medium Company Blend Account (4,798) 47,275 154,028 201,303 International Stock Account (29,269) 26,913 197,150 224,063 Real Estate Account 4,386 6,124 3,635 9,759 Company Stock (52,030) (105,894) 490,751 384,857 Participant Notes (13,032) (6,702) 60,500 53,798 ============== =========== =========== =========== $ (246,097) $ 216,258 $2,760,039 $2,976,297 ============== =========== =========== =========== Year ended December 31, 1997 -------------------------------------------------------------------------------------- Additions -------------------------------------------------------------------------------------- Investment income --------------------------------------------------- Net appreciation (depreciation) in fair value of Contributions investments -------------------------------- Interest (Note 3) Total Employer Participants ------------- ------------------ --------------- --------------- --------------- Principal Investments: Guaranteed Interest Accounts $ 8,642 $ - $ 8,642 $ 9,010 $ 16,163 Money Market Account - 5,026 5,026 (132) 3,118 Government Securities Account - 8,265 8,265 2,756 9,024 Bond & Mortgage Account - 8,737 8,737 6,809 11,270 Bond Emphasis Balanced Account - 6,235 6,235 2,283 2,875 Stock Emphasis Balanced Account - 20,899 20,899 4,794 14,233 Stock Index 500 Account - 29,377 29,377 10,823 16,121 U.S. Stock Account - 55,133 55,133 17,085 21,937 Medium Company Value Account - 56,196 56,196 11,176 18,589 Small Company Blend Account - 84,569 84,569 28,427 37,653 Medium Company Blend Account - 29,454 29,454 11,230 18,013 International Stock Account - 23,400 23,400 15,955 16,559 Real Estate Account - 380 380 - - Company Stock - (46,508) (46,508) 67,691 50,528 Participant Notes 6,892 - 6,892 - - ============= ================== =============== =============== =============== $ 15,534 $ 281,163 $ 296,697 $ 187,907 $ 236,083 ============= ================== =============== =============== =============== Year ended December 31, 1997 -------------------------------------------------------------------------------------- Additions ---------------------------------- (Deductions) Contributions --------------------------------------------------- ----------------- Total Participant Admin. Interfund Total additions benefits expenses transfers --------------- --------------- ----------------- -------------- --------------- Principal Investments: Guaranteed Interest Accounts $ 25,173 $ 33,815 $ (7,902) $ (128) $ (17,043) Money Market Account 2,986 8,012 (1,093) (25) 8,019 Government Securities Account 11,780 20,045 (6,444) (37) 109,202 Bond & Mortgage Account 18,079 26,816 (1,138) (50) (9,103) Bond Emphasis Balanced Account 5,158 11,393 - (37) 789 Stock Emphasis Balanced Account 19,027 39,926 (1,566) (56) 17,471 Stock Index 500 Account 26,944 56,321 - (54) 20,671 U.S. Stock Account 39,022 94,155 - (69) (28,146) Medium Company Value Account 29,765 85,961 (1,768) (82) (8,139) Small Company Blend Account 66,080 150,649 (1,633) (153) (14,810) Medium Company Blend Account 29,243 58,697 - (81) (8,486) International Stock Account 32,514 55,914 (10,128) (120) (31,209) Real Estate Account - 380 - (4) - Company Stock 118,219 71,711 (1,025) - (76,231) Participant Notes - 6,892 - - (12,985) =============== =============== ================= ============== =============== $ 423,990 $ 720,687 $ (32,697) $ (896) $ - =============== =============== ================= ============== =============== Year ended December 31, 1998 --------------------------------------------------------------------------------------- (Deductions) --------------- Net assets at Net assets at Total Net increase beginning of end of deductions (decrease) year year -------------- ------------- ------------- -------------- Principal Investments: Guaranteed Interest Accounts $ (25,073) $ 8,742 $ 128,516 $ 137,258 Money Market Account 6,901 14,913 92,187 107,100 Government Securities Account 102,721 122,766 47,333 170,099 Bond & Mortgage Account (10,291) 16,525 80,356 96,881 Bond Emphasis Balanced Account 752 12,145 42,031 54,176 Stock Emphasis Balanced Account 15,849 55,775 96,847 152,622 Stock Index 500 Account 20,617 76,938 77,369 154,307 U.S. Stock Account (28,215) 65,940 204,474 270,414 Medium Company Value Account (9,989) 75,972 145,719 221,691 Small Company Blend Account (16,596) 134,053 355,374 489,427 Medium Company Blend Account (8,567) 50,130 103,989 154,028 International Stock Account (41,457) 14,457 182,693 197,150 Real Estate Account (3) 377 3,258 3,635 Company Stock (27,256) 44,455 446,296 490,751 Participant Notes (12,985) (6,093) 66,593 60,500 ============== ========== =========== ========== $ (33,592 $ 687,095 $2,077,944 $2,760,039 ============== ========== =========== ========== The accompanying notes are an integral part of these financial statements. 3 PETROCORP INCORPORATED 401(K) RETIREMENT SAVINGS PLAN Notes to Financial Statements (unaudited) NOTE 1 - DESCRIPTION OF PLAN: The following description of the PetroCorp Incorporated 401(k) Retirement Savings Plan (the Plan) provides only general information. Participants should refer to the Plan agreement for a more complete description of the Plan's provisions. General The Plan is a defined contribution 401(k) retirement savings plan, adopted January 1, 1993. Employees of PetroCorp Incorporated (the Company) become eligible to participate in the Plan after six months of service with the Company. The entry date for each employee is the first day of the month following the sixth month of service. The Plan is subject to the provisions of the Employee Retirement Income Security Act of 1974 (ERISA). All Plan contributions are invested in separate pooled accounts under an annuity contract with Principal Mutual Life Insurance Company (Principal) or in common stock of the Company. Contributions Participants may contribute to the Plan subject to certain Internal Revenue Code limitations. The Company may match up to 100 percent of each participant's contributions not to exceed six (6) percent of each participant's annual compensation. Additionally, the Company may make discretionary contributions on behalf of the participants. In any event, total contributions by the participant and the Company may not exceed 20 percent of the participant's annual compensation. During 1998 and 1997, each participant could contribute up to 14 percent of his annual compensation with the Company matching up to six (6) percent, except in certain cases subject to Internal Revenue Code limitations. The Plan also allows participants to "rollover" contributions that have been made to other qualified plans. Participant accounts Each participant's account is credited with the participant's contributions, the Company's contributions and a pro rata share of the earnings of each fund in which the participant has invested. The benefit to which a participant is entitled is the benefit that can be provided from the participant's account. Vesting Participants are fully vested at all times in their individual contributions and "rollover" contributions plus actual earnings thereon. Vesting in employer contributions and related earnings is based on the participant's employment commencement date and years of continuous service. Participant's whose employment commencement date occurred before 4 January 1, 1994 are 100% vested. Participant's whose employment commencement date occurred on or after January 1, 1994 are vested as follows: Vesting Service Vesting (whole years) Percentage ------------- ---------- Less than 1 year 0% 1 year 25% 2 years 50% 3 years 75% 4 or more years 100% In addition, participants also become fully vested in their employer contributions and related earnings upon retirement, at or after age 65, or upon death or total disability of the participant. Investment options Effective January 1, 1994, upon enrollment in the Plan, a participant may direct contributions in any of fourteen investment options as follows: Guaranteed Interest Account - Funds are invested in a guaranteed investment contract (GIC) with Principal. U.S. Stock Account - This is a separate pooled account with Principal in which the funds are invested in various stocks of U.S. companies with the intent to earn higher long-term rates of return. Money Market Account - This is a separate pooled account with Principal in which the funds are invested in high quality commercial paper with average maturities kept under 30 days to ensure current money market rates. Real Estate Account - This is a separate pooled account with Principal in which the funds are invested in equity investments in modern, developed, income-producing warehouses, office buildings and retail centers in major U.S. metropolitan areas. Earnings consist of property value changes and net rental income. Bond & Mortgage Account - This is a separate pooled account with Principal in which the funds are invested in investment grade private placement bonds, commercial mortgages, public corporate bonds and mortgage-backed securities, all generally mature within five to 10 years. International Stock Account - This is a separate pooled account with Principal in which the funds are invested in stocks of non-U.S. companies located primarily in Europe and Southeast Asia. Government Securities Account - This is a separate pooled account with Principal in which the funds are invested primarily in very high quality government mortgage-backed securities. Stock Index 500 Account - This is a separate pooled account with Principal in which the funds are invested in the same stocks and in the same proportions as those stocks included in the Standard & Poor's 500 Stock Index. Medium Company Value Account - This is a separate pooled account with Principal in which the funds are invested in primarily income-producing common stocks that are under-valued in the marketplace according to traditional measures of value. Small Company Blend Account - This is a separate pooled account with Principal in which funds are invested in stocks of smaller, fast-growing companies. 5 Medium Company Blend Account - This is a separate pooled account with Principal in which funds are invested in stocks of large, established companies whose earnings are expected to grow faster than the average company. Bond Emphasis Balanced Account - This is a separate pooled account with Principal in which funds are invested in many asset classes, but emphasizes fixed income. This account invests 50 to 100 percent of the funds in Principal fixed-income separate pooled accounts, with the remainder in Principal equity separate pooled accounts. Stock Emphasis Balanced Account - This is a separate pooled account with Principal in which funds are invested in many asset classes, but emphasizes equities. This account invests 50 to 100 percent of the funds in Principal equity separate pooled accounts, with the remainder in Principal fixed- income separate pooled accounts. Company Stock - Funds are invested in the common stock of the Company. Payment of benefits Distribution of the participant's entire account balance becomes due and payable upon retirement, at or after age 65, or upon death or total disability of the participant. Such account balances may be distributed either in a lump-sum distribution or in installments, as described in the Plan agreement. Upon termination of employment, a participant may elect to receive a lump-sum distribution equal to the vested balance of the participant's account or continue to participate in the Plan investments. If the vested balance is less than $3,500, payment is made as soon as administratively practicable after termination. Additionally, participants may make hardship withdrawals from their individual contribution accounts at specified times during the Plan year, subject to certain restrictions. Participants' notes receivable Under the terms of the Plan, with certain restrictions, participants may borrow from their accounts a minimum of $1,000 up to a maximum of the lessor of $50,000 or 50 percent of their vested account balances. A loan is secured by the vested balance in the participant's account and bears interest at the prime interest rate plus two (2) percent. During 1998, the interest rate for new borrowings was 10.50 percent. During 1997, the interest rates ranged from 10.25 percent to 10.50 percent. NOTE 2 - SUMMARY OF ACCOUNTING POLICIES: Under the Department of Labor Rules and Regulations for Reporting and Disclosure under ERISA, the Plan files Form 5500-C/R which is required for employee benefit plans with fewer than 100 participants. Employee benefit plans with 100 or more participants are required to file Form 5500. Those plans filing Form 5500 are required to prepare audited financial statements as well as all applicable schedules required by Section 2520.103-10 of the Department of Labor's Rules and Regulations for Reporting and Disclosure under ERISA. Such requirements are not mandated for those plans filing Form 5500-C/R. Accordingly, the attached financial statements are unaudited and the above mentioned schedules are not presented. Method of accounting The Plan's financial statements are prepared on the accrual basis of accounting. Investments Plan investments, other than the GIC's, are stated at fair value. The Company stock is valued at its quoted market price. Separate pooled accounts are valued at net asset value representing the value at which units of the account may be purchased or redeemed. 6 The Plan's GIC's are valued at contract value. Contract value represents contributions made under the contract plus interest at the guaranteed rate. Contributions Participant contributions are recorded in the period during which the Company makes payroll deductions from the Plan participants' earnings. Matching Company contributions are recorded in the same period. NOTE 3 - INVESTMENTS: Individual investments representing five (5) percent or more of the Plan's net assets are as follows: December 31, ----------------------------- 1998 1997 ------- -------- Investments at fair value as determined by quoted market price: Pooled separate accounts: Principal: Government Securities Account $ 255,653 $170,099 Stock Emphasis Balanced Account - * 152,622 Stock Index 500 Account 365,444 154,307 U.S. Stock Account 321,043 270,414 Medium Company Value Account 237,234 221,691 Small Company Blend Account 399,349 489,427 Medium Company Blend Account 201,303 154,028 International Stock Account 224,063 197,150 Company Stock: PetroCorp Incorporated Common Shares $ 384,857 $490,751 Investments at contract value: Guaranteed Investment Contracts with Principal - * - * * less than five (5) percent 7 The net realized and unrealized appreciation (depreciation) in fair value of investments included in the statements of changes in net assets available for Plan benefits were $5,731 and $281,163 for the years ended December 31, 1998 and 1997, respectively, and consisted of the following: Year ended December 31, ---------------------------- 1998 1997 ------ ------ Net appreciation (depreciation) in investments at fair value as determined by quoted market price: Pooled separate accounts: Principal: U.S. Stock Account $ 40,152 $ 55,133 Money Market Account 5,060 5,026 Real Estate Account 437 380 Bond & Mortgage Account 7,259 8,737 International Stock Account 20,985 23,400 Government Securities Account 15,794 8,265 Stock Index 500 Account 60,877 29,377 Medium Company Value Account 8,696 56,196 Small Company Blend Account (43,349) 84,569 Medium Company Blend Account 10,976 29,454 Bond Emphasis Balanced Account 5,077 6,235 Stock Emphasis Balanced Account 16,832 20,899 Company Stock (143,065) (46,508) ---------- -------- $ 5,731 $281,163 ========== ======== NOTE 4 - GUARANTEED INVESTMENT CONTRACTS: The Plan entered into five-year GIC's with Principal in each of the last five years. The GIC's provide for guaranteed returns ranging from 6.10% to 7.30% on contributions invested over the five-year terms of the contracts. The GIC's are included in the financial statements at contract value as reported to the Plan by Principal. NOTE 5 - PLAN TERMINATION: Although it has not expressed any intent to do so, the Company has the right under the Plan to discontinue its contributions at any time and to terminate the Plan subject to the provisions of ERISA. In the event of Plan termination, participants will become fully vested in their accounts. NOTE 6 - INCOME TAX STATUS OF PLAN: The Company had requested the Internal Revenue Service to determine and inform the Company that the Plan is designed in accordance with applicable sections of the Internal Revenue Code. On December 14, 1995, the Internal Revenue Service notified the Company that they had made a favorable determination on the Plan. 8 SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934, the trustees (or other persons who administer the employee benefit plan) have duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized. PETROCORP INCORPORATED 401(k) RETIREMENT SAVINGS PLAN Date: June 18, 1999 /s/ CRAIG K. TOWNSEND - ----------------------- -------------------------------------------------- Craig K. Townsend Vice President - Finance of PetroCorp Incorporated and Trustee 9