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) [X] ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 [NO FEE REQUIRED] For the fiscal year ended December 31, 2005. Commission file number 0-20793 A. Full title of the plan and the address of the plan, if different from that of the issuer named below: SMITHWAY MOTOR XPRESS, INC. 401(k) RETIREMENT SAVINGS AND INVESTMENT PLAN B. Name of issuer of the securities held pursuant to the plan and the address of its principal executive office: SMITHWAY MOTOR XPRESS CORP. 2031 QUAIL AVENUE FORT DODGE, IOWA 50501 SMITHWAY MOTOR XPRESS, INC. 401(k) RETIREMENT SAVINGS AND INVESTMENT PLAN Financial Statements and Schedule December 31, 2005 and 2004 (With Report of Independent Registered Public Accounting Firm) SMITHWAY MOTOR XPRESS, INC. 401(k) RETIREMENT SAVINGS AND INVESTMENT PLAN TABLE OF CONTENTS PAGE Report of Independent Registered Public Accounting Firm 1 Statements of Net Assets Available for Plan Benefits 2 Statements of Changes in Net Assets Available for Plan Benefits 3 Notes to Financial Statements 4 SCHEDULE 1 Schedule of Assets Held for Investment Purposes at End of Year 8 REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM The Plan Trustees Smithway Motor Xpress, Inc. 401(k) Retirement Savings and Investment Plan: We have audited the accompanying statements of net assets available for plan benefits of Smithway Motor Xpress, Inc. 401(k) Retirement Savings and Investment Plan (the Plan) as of December 31, 2005 and 2004, and the related statements of changes in net assets available for plan 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 the standards of the Public Company Accounting Oversight Board (United States). 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, the financial statements referred to above present fairly, in all material respects, the net assets available for plan benefits of Smithway Motor Xpress, Inc. 401(k) Retirement Savings and Investment Plan as of December 31, 2005 and 2004, and the changes in its net assets available for plan benefits for the years then ended, in conformity with U.S. generally accepted accounting principles. Our audits of the Plan's financial statements as of and for the years ended December 31, 2005 and 2004 were made for the purpose of forming an opinion on the basic financial statements taken as a whole. The supplemental schedule 1 is presented for the purpose 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. This supplemental schedule is the responsibility of the Plan's management. The supplemental schedule has been subjected to the auditing procedures applied in the audits 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/ KPMG LLP June 27, 2006 Des Moines, Iowa 1 SMITHWAY MOTOR XPRESS, INC. 401(K) RETIREMENT SAVINGS AND INVESTMENT PLAN Statement of Net Assets Available for Plan Benefits December 31, 2005 and 2004 <Table> <Caption> ------------------------------ 2005 2004 ----------- ----------- ASSETS: Investments (note 9): Investment in registered investment companies .... $ 8,015,746 $ 6,450,142 Investment in common trust ....................... - 823,767 Common Stock ..................................... 3,330,286 2,993,009 Loans to participants ............................ 451,052 439,477 ----------- ----------- 11,797,084 10,706,395 ----------- ----------- Contributions receivable: Employer ........................................... 260,520 188,596 Employee ........................................... 102,655 81,948 ----------- ----------- Total Assets ................................... 12,160,259 10,976,939 ----------- ----------- Liabilities (note 6) ................................. 8,199 - ----------- ----------- Net assets available for plan benefits (note 2) $12,152,060 $10,976,939 =========== =========== </Table> See accompanying notes to financial statements 2 SMITHWAY MOTOR XPRESS, INC. 401(K) RETIREMENT SAVINGS AND INVESTMENT PLAN Statement of Changes in Net Assets Available for Plan Benefits Years ended December 31, 2005 and 2004 <Table> <Caption> ------------------------------ 2005 2004 ----------- ----------- Additions to net assets attributed to: Employer contributions (note 3) ........................... $ 260,520 $ 188,596 Employee contributions and rollovers (note 3) ............. 1,075,571 1,013,113 Net investment gain (notes 2 and 9) ....................... 1,031,743 2,815,263 ----------- ----------- Total additions ...................................... 2,367,834 4,016,972 ----------- ----------- Deduction from net assets attributed to: Benefits paid to participants (note 5) .................... 1,148,539 1,842,956 Administrative fees ....................................... 42,259 11,257 Other ..................................................... 1,915 4,815 ----------- ----------- Total deductions ..................................... 1,192,713 1,859,028 ----------- ----------- Net increase in net assets available for plan benefits 1,175,121 2,157,944 Net assets available for plan benefits: Beginning of year ......................................... 10,976,939 8,818,995 ----------- ----------- End of year ............................................... $12,152,060 $10,976,939 =========== =========== </Table> See accompanying notes to financial statements 3 SMITHWAY MOTOR XPRESS, INC. 401(K) RETIREMENT SAVINGS AND INVESTMENT PLAN Notes to Financial Statements December 31, 2005 and 2004 (1) SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (a) PLAN INFORMATION AND BASIS OF PRESENTATION The accompanying financial statements of Smithway Motor Xpress, Inc. 401(k) Retirement Savings and Investment Plan (the Plan) have been prepared on the accrual basis of accounting and are subject to the provisions of the Employee Retirement Income Security Act of 1974 (ERISA). The Plan is sponsored by Smithway Motor Xpress Corp. (the Company) and has two entry dates per year. Full-time employees are eligible for participation in the Plan on the next entry date after completing ninety days of service and attaining twenty-one years of age. Participants should refer to the Plan agreement for more complete information. The Company's Employee Stock Ownership Plan (the ESOP) was merged with the Plan on January 1, 1997. No additional contributions were made to the ESOP. Effective January 1, 2005, the Plan was amended to remain in compliance with the Economic Growth and Tax Relief Reconciliation Act of 2001, the Job Creation and Worker Assistance Act of 2002, IRS Regulations, and other IRS guidance. (b) INVESTMENTS Investments, other than loans, are reported at fair value as determined by using available market information. Purchases and sales of securities are recorded on a trade-date basis. Loans to participants are valued at their unpaid principal balance, representing estimated fair value. Net investment income includes investment income, realized gains (losses), and unrealized appreciation (depreciation) on investments held. (c) ADMINISTRATIVE FEES Certain administrative fees are paid by the Company. (d) INCOME TAXES The Internal Revenue Service has issued a determination letter that the Plan is qualified, and the trust established under the Plan is tax-exempt, under Sections 401(a) and 501(a) of the Internal Revenue Code. Franklin Templeton (the Plan Administrator) and the Plan's tax counsel believe the Plan is currently designed and operated in compliance with the applicable requirements of the Internal Revenue Code. Therefore, they believe the Plan was qualified and the related trust was tax-exempt as of December 31, 2005 and 2004. As noted above, the Plan was amended on January 1, 2005. Management believes this amendment did not adversely impact the Plan's compliance with the applicable requirements of the Internal Revenue Code. Future qualification of the Plan will depend on continuing operation in compliance with the Internal Revenue Code. (e) USE OF ESTIMATES The Plan Administrator has made a number of estimates and assumptions relating to the reporting of assets, liabilities, and changes therein to prepare these financial statements in conformity with U.S. generally accepted accounting principles. Actual results could differ from those estimates. 4 (continued) SMITHWAY MOTOR XPRESS, INC. 401(K) RETIREMENT SAVINGS AND INVESTMENT PLAN (2) NET ASSETS AVAILABLE FOR PLAN BENEFITS The Plan Administrator maintains funds received from the Plan primarily in registered investment companies or in the Company's common stock. (3) CONTRIBUTIONS Under the terms of the Plan agreement, the Company may, at its discretion, make annual contributions to the Plan, which shall be allocated to eligible participants based on a percentage of the total deferred compensation contributed during the Plan year. Contributions totaled $260,520 and $188,596 for the years ended December 31, 2005 and 2004, respectively. Forfeitures, if any, are used to reduce future employer contributions. Employees may make voluntary contributions to the Plan up to certain IRS limitations. (4) PARTICIPANT ACCOUNTS Each participant's account is credited with the participant's contribution, the employer's contribution, and an allocation of Plan earnings. Each participant will be permitted to direct the Plan Administrator to invest their individual accounts into various approved investments permitted under the Plan. Participants are immediately vested in their voluntary contributions and the earnings thereon. Vesting of employer matching contributions is based on years of continuous service in which the participant has completed at least 1,000 hours of service as follows: <Table> <Caption> PERCENTAGE YEARS OF SERVICE VESTED ---------------- ------------ 1 0% 2 20% 3 40% 4 60% 5 80% 6 100% </Table> (5) BENEFITS Under the terms of the Plan agreement, participants or their beneficiaries are eligible for benefits upon retirement, death, or disability. Benefits shall be distributed through one of several options selected by the participants, as defined in the Plan agreement. Distributions from the participants' ESOP accounts are made in shares of the Company stock or cash. All other distributions are made in cash. (6) LIABILITIES Liabilities include refunds payable for excess contributions received by the Plan which are reimbursable to the participants, benefit claims payables, and other miscellaneous operating payables. (7) PLAN TERMINATION Although the Company has not expressed any intent to terminate its participation in the Plan, it may do so at any time, subject to the provisions set forth in ERISA. Should the Plan be terminated at some future time, all participants become 100% vested in all benefits earned from both employee and employer contributions as of the termination date. 5 (continued) SMITHWAY MOTOR XPRESS, INC. 401(K) RETIREMENT SAVINGS AND INVESTMENT PLAN (8) PARTY-IN-INTEREST TRANSACTIONS Transactions resulting in Plan assets being transferred to or used by a related party are prohibited under ERISA unless a specific exemption applies. Franklin Templeton, as Plan Administrator, is a party-in-interest as defined by ERISA as a result of investing Plan assets in its own funds. The Company is a party-in-interest as a result of the Plan participants being able to invest in Company stock. A participant who acquires a participant loan is a party-in-interest. However, such transactions are exempt and are not prohibited by ERISA. (9) INVESTMENTS The fair values of the investments of the Plan at December 31, 2005 and 2004 were as follows: <Table> <Caption> 2005 ----------- Galliard Stable Return Fund * $ 1,143,938 Franklin Templeton U.S. Government Securities Fund * 818,221 Franklin Templeton Total Return Fund * 67,739 Franklin Templeton Income Fund * 1,249,103 Franklin Templeton Age High Income Fund * 37,696 Franklin Templeton Growth Fund * 139,112 Mutual Shares * 305,154 Franklin Templeton Small Cap Value Fund * 107,635 Fidelity Magellan Fund 2,281,090 Franklin Templeton Capital Growth Fund * 140,345 Franklin Templeton Flex Cap Growth Fund * 1,546,331 Franklin Templeton Small-Midcap Growth Fund * 43,592 Templeton Growth Fund * 135,789 Smithway Motor Xpress Corp. common stock * 3,330,286 Participant Loans * 451,052 ----------- $11,797,083 =========== </Table> <Table> <Caption> 2004 ----------- Franklin Templeton Stable Value Fund * $ 823,767 Franklin Templeton U.S. Government Securities Fund * 774,309 Franklin Templeton Total Return Fund * 32,894 Franklin Templeton Income Fund * 1,378,880 Franklin Templeton Age High Income Fund * 25,926 Franklin Templeton Growth Fund * 124,059 Mutual Shares * 227,652 Franklin Templeton Small Cap Value Fund * 38,330 Fidelity Magellan Fund 2,154,717 Franklin Templeton Capital Growth Fund * 112,288 Franklin Templeton Flex Cap Growth Fund * 1,478,282 Franklin Templeton Small-Midcap Growth Fund * 25,631 Templeton Growth Fund * 77,174 Smithway Motor Xpress Corp. common stock * 2,993,009 Participant Loans * 439,477 ----------- $10,706,395 =========== </Table> 6 (continued) SMITHWAY MOTOR XPRESS, INC. 401(K) RETIREMENT SAVINGS AND INVESTMENT PLAN Included in net investment gain for the years ended December 31, 2005 and 2004 is appreciation of investments (including gains and losses on investments bought and sold, as well as held during the year) and investment income as follows: <Table> <Caption> 2005 2004 ---------- ---------- Registered investment companies $ 342,951 404,515 Common stock * 665,666 2,386,815 Participant loans * 23,126 23,933 ---------- ---------- $1,031,743 2,815,263 ========== ========= * Party-in-interest </Table> (10) PARTICIPANT LOANS Participants are allowed to borrow from the vested portion of their account. The minimum loan is $1,000. The maximum loan is the lesser of 50% of the participant's vested account balance or $50,000. 7 SMITHWAY MOTOR XPRESS, INC. 401(K) RETIREMENT SAVINGS AND INVESTMENT PLAN Schedule of Assets Held for Investment Purposes at End of Year December 31, 2005 <Table> <Caption> Cost Fair Value ----------- ----------- Galliard Stable Return Fund * $ 1,120,476 1,143,939 Franklin Templeton U.S. Government Securities Fund * 826,330 818,221 Franklin Templeton Total Return Fund * 68,720 67,739 Franklin Templeton Income Fund * 1,251,974 1,249,103 Franklin Templeton Age High Income Fund * 37,048 37,696 Franklin Templeton Growth Fund * 125,700 139,112 Mutual Shares * 296,955 305,154 Franklin Templeton Small Cap Value Fund * 103,013 107,635 Fidelity Magellan Fund 2,133,059 2,281,090 Franklin Templeton Capital Growth Fund * 130,056 140,345 Franklin Templeton Flex Cap Growth Fund * 1,365,795 1,546,331 Franklin Templeton Small-Midcap Growth Fund * 37,474 43,592 Templeton Growth Fund * 135,676 135,789 Smithway Motor Xpress Corp. common stock * 3,355,000 3,330,286 ----------- ----------- 10,987,276 11,346,032 Loans to participants * (with interest rates from 4.25% to 10.5% and various maturity dates) 451,052 451,052 ----------- ----------- $11,438,328 11,797,084 =========== =========== </Table> *PARTY-IN-INTEREST. See accompanying independent auditors' report. 8 SMITHWAY MOTOR XPRESS, INC. 401(K) RETIREMENT SAVINGS AND INVESTMENT PLAN Schedule of Assets Held for Investment Purposes at End of Year December 31, 2004 <Table> <Caption> Cost Fair Value ----------- ----------- Franklin Templeton Stable Value Fund * $ 823,767 823,767 Franklin Templeton U.S. Government Securities Fund * 784,996 774,309 Franklin Templeton Total Return Fund * 32,550 32,894 Franklin Templeton Income Fund * 1,326,341 1,378,880 Franklin Templeton Age High Income Fund * 24,928 25,926 Franklin Templeton Growth Fund * 113,804 124,059 Mutual Shares * 211,350 227,652 Franklin Templeton Small Cap Value Fund * 34,438 38,330 Fidelity Magellan Fund 2,066,418 2,154,717 Franklin Templeton Capital Growth Fund * 106,758 112,288 Franklin Templeton Flex Cap Growth Fund * 1,359,807 1,478,282 Franklin Templeton Small-Midcap Growth Fund * 22,946 25,631 Templeton Growth Fund * 71,999 77,174 Smithway Motor Xpress Corp. common stock * 957,475 2,993,009 ----------- ----------- 7,937,577 10,266,918 Loans to participants * (with interest rates from 4.25% to 10.5% and various maturity dates) 439,477 439,477 ----------- ----------- $ 8,377,054 10,706,395 =========== =========== *PARTY-IN-INTEREST. See accompanying independent auditors' report. 9 SIGNATURES The Plan. 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 annual report to be signed on its behalf by the undersigned hereunto duly authorized SMITHWAY MOTOR XPRESS, INC. 401(k) RETIREMENT SAVINGS AND INVESTMENT PLAN Date: June 27, 2006 By: /s/ Tom Nelson ---------------------------- Tom Nelson, Administrator 10 EXHIBIT INDEX Exhibit Number ------ 23 Consent of KPMG LLP, independent registered public accounting firm