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 For the fiscal year ended December 30, 1999 Commission File No. 0-24612 ADTRAN, INC. 401(k) EMPLOYEE SAVINGS PLAN ADTRAN, Inc. (Exact name of Registrant as specified in its charter) Delaware 63-0918200 (State of incorporation) (I.R.S. Employer Identification Number) 901 Explorer Boulevard, Huntsville, Alabama 35806-2807 (Address of principal executive offices, including zip code) (256) 963-8000 (Registrant's telephone number, including area code) Required Information: The Plan is subject to the Employee Retirement Income Security Act of 1974 ("ERISA"). Therefore, in lieu of the requirements of Items 1-3 of Form 11-K, the financial statements and schedules of the Plan for the two fiscal years ended December 31, 1999 and 1998, which have been prepared in accordance with the financial reporting requirements of ERISA, and the consent of PricewaterhouseCoopers, are filed as a part of this annual report: Signatures: Pursuant to the requirements of the Securities Exchange Act of 1934, the trustees (or other persons who administer the Plan) have duly caused this annual report to be signed on its behalf by the undersigned hereunto duly authorized. ADTRAN, Inc. 401(k) EMPLOYEE SAVINGS PLAN /s/ John R. Cooper October 16, 2000 - ------------------ ---------------- John R. Cooper Date Vice President - Administration and Finance and Chief Financial Officer ADTRAN, Inc. 401(k) Employee Savings Plan Financial Statements and Supplemental Schedule December 31, 1999 and 1998 ADTRAN, Inc. 401(k) Employee Savings Plan Table of Contents - -------------------------------------------------------------------------------- Pages Report of Independent Accountants 1 Financial Statements: Statements of Net Assets Available for Plan Benefits December 31, 1999 and 1998 2 Statement of Changes in Net Assets Available for Plan Benefits for the Year Ended December 31, 1999 3 Notes to Financial Statements 4 - 8 *Supplemental Schedule: Schedule of Assets Held For Investment Purposes as of December 31, 1999 9 *Other schedules required by 29 CFR 2520.130-10 of the Department of Labor's Rules and Regulations for Disclosure under the Employee Retirement Income Security Act of 1974 have been omitted because they are not applicable. Report of Independent Accountants To the Participants and Administrator of the ADTRAN, Inc. 401(k) Employee Savings Plan In our opinion, the accompanying statements of net assets available for plan benefits and the related statement of changes in net assets available for plan benefits present fairly, in all material respects, the net assets available for plan benefits of ADTRAN, Inc. 401(k) Employee Savings Plan (the "Plan") at December 31, 1999 and 1998, and the changes in net assets available for plan benefits for the year ended December 31, 1999 in conformity with accounting principles generally accepted in the United States of America. 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 of these statements in accordance with auditing standards generally accepted in the United States of America, which require that we plan and perform the audits 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 the opinion expressed above. Our audits were conducted for the purpose of forming an opinion on the basic financial statements taken as a whole. The supplemental schedule, as listed on the accompanying table of contents, 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. June 21, 2000 1 ADTRAN, Inc. 401(k) Employee Savings Plan Statements of Net Assets Available for Plan Benefits December 31, 1999 and 1998 - -------------------------------------------------------------------------------- 1999 1998 ASSETS Investments, at market value $27,571,046 $19,684,006 Contributions receivable: Employer 15,215 13,068 Employee 43,792 36,471 ----------- ----------- Net assets available for plan benefits $27,630,053 $19,733,545 =========== =========== The accompanying notes are an integral part of these financial statements. 2 ADTRAN, Inc. 401(k) Employee Savings Plan Statement of Changes in Net Assets Available for Plan Benefits For the Year Ended December 31, 1999 - -------------------------------------------------------------------------------- Investment income: Interest and dividend income $ 261,664 Net appreciation in market value of investments 3,559,026 ----------- Total investment income 3,820,690 ----------- Contributions: Employee contributions 3,329,130 Rollover proceeds 753,378 Employer contributions 1,140,213 ----------- Total contributions 5,222,721 ----------- Total additions 9,043,411 ----------- Benefits paid to participants 1,136,255 Administrative expenses 10,648 ----------- Total deductions 1,146,903 ----------- Net increase 7,896,508 Net assets available for plan benefits: Beginning of year 19,733,545 ----------- End of year $27,630,053 =========== The accompanying notes are an integral part of these financial statements. 3 ADTRAN, Inc. 401(k) Employee Savings Plan Notes to Financial Statements For the Years Ended December 31, 1999 and 1998 - -------------------------------------------------------------------------------- 1. Description of the Plan The following brief description of the ADTRAN, Inc. 401(k) Employee Savings Plan (the Plan) is provided for general information only. Participants should refer to the plan agreement for a more complete description of the Plan's provisions. General - ADTRAN, Inc. (the Company and the Employer) formed the Plan effective January 1, 1990 to provide certain retirement, death, and disability benefits for its employees. The Plan is a defined contribution plan subject to the provisions set forth in the Employee Retirement Income Security Act of 1974 (ERISA) and is funded by discretionary employee and employer contributions. The plan assets are held by AUSA Life Insurance Company, Inc. (the Custodian) which executes investment transactions, receives the plan contributions, credits participants' individual accounts, and pays benefits to participants and their beneficiaries in accordance with the provisions of the Plan. The Plan was amended, effective July 1, 1997, to allow the Company's common stock to be purchased by the Plan. Eligibility - An employee is eligible to participate in the Plan following the completion of six months of service and attainment of age twenty-one. Contributions - Employees participating in the Plan elect to have 1% to 16% of their salaries deferred and contributed to the Plan. For each employee who participated in the Plan during 1999, the Company made matching contributions equal to 50% of the first 5% of salary deferred by the participants. At its discretion, the Company may contribute to the Plan a discretionary profit- sharing contribution, which shall be in addition to the Company's matching contribution. No discretionary contributions were made in 1999. Each participant directs how contributions made by the participant and by the Company on his/her behalf are to be invested among the investment options available under the Plan. The Plan currently offers twelve pooled separate accounts, one guaranteed interest account, and a Company stock fund. Participant Accounts - Each participant's account is credited with the employee's contribution and the Company's matching contribution plus an allocation of Company discretionary contributions and plan earnings. Allocations are based on account balances, as defined more fully in the plan agreement. The benefit to which a participant is entitled is the benefit that can be provided from the participant's account. Vesting - Employees are always 100% vested in their individual accounts. Retirement Date - The normal retirement date is the first day of the calendar month following the date a participant reaches age 62. Early retirement is permitted after a participant reaches age 59-1/2. 4 ADTRAN, Inc. 401(k) Employee Savings Plan Notes to Financial Statements For the Years Ended December 31, 1999 and 1998 - -------------------------------------------------------------------------------- Distribution of Benefits - Benefits commence upon one of several dates: normal retirement, early retirement, date of disability, pre-retirement death, and upon termination other than described above. Benefits are distributed by means of either a lump sum payment or by one of various conventional annuity options. Other - The Plan allows for participant hardship withdrawals at any time if certain conditions are met. Plan Termination - While it is the intention of the Company to permanently continue the Plan, the Company has the right to amend or terminate the Plan at any time upon written notice to the Savings Committee and to the plan Custodian. No amendment may permit any plan assets to revert to the Employer or be used for any purpose other than to provide benefits to participants and their beneficiaries, or eliminate an optional form of benefit payment. Upon termination of the plan, plan assets will be distributed to participants and their beneficiaries in accordance with the Plan and subject to ERISA guidelines. Participant Loans - Participants may borrow a minimum of $1,000 from their fund accounts up to a maximum equal to the lesser of $50,000 or 50% of their account balance. Loan transactions are treated as transfers between the investment fund and the participant loan fund. Loan terms range from one to five years unless such loan is used to acquire a principal residence. The outstanding loans at December 31, 1999 are collateralized by the balances in the participants' accounts and bear interest at rates commensurate with local prevailing rates as determined quarterly by the plan administrator. Interest rates range from 8.25% to 10% for loans that were outstanding as of December 31, 1999. Administrative Expenses - All expenses incident to the functioning of the Plan may be paid out of plan assets unless paid by the Employer. Accrued expenses constitute a liability of the Plan until paid, and may be reimbursed by the Employer. Any such reimbursement is not considered an Employer contribution. 2. Summary of Significant Accounting Policies The following is a summary of accounting policies utilized in the financial statements which were prepared in accordance with accounting principles generally accepted in the United States of America. Basis of Accounting - The accounting records of the Plan are maintained on the accrual basis in accordance with accounting principles generally accepted in the United States of America. 5 ADTRAN, Inc. 401(k) Employee Savings Plan Notes to Financial Statements For the Years Ended December 31, 1999 and 1998 - -------------------------------------------------------------------------------- Valuation of Investments - Investments in pooled separate accounts and unallocated contracts with insurance companies are stated at contract value as determined by the Custodian. Market value of equity securities which are traded on a national exchange are valued at the last reported sales price on the last business day of the plan year. Purchases and sales of investments are reflected as of the trade date. Dividend and interest income is recorded when earned. The Plan presents, in the statement of changes in net assets available for plan benefits, the net appreciation (depreciation) in the market value of its investments which consists of the realized gains or losses and the unrealized appreciation (depreciation) on those investments. Contributions - Contributions from the Employer are accrued based on amounts declared by the Company's Savings Committee. Contributions from employees are recorded in the period in which the Company makes the deductions from the participants' payroll. Risks and Uncertainties - The Plan provides for various investment options in any combination of stocks, bonds, fixed income securities, and other investment securities. Investment securities are exposed to various risks, such as interest rate, market, and credit risks. Due to the level of risk associated with certain investment securities and the level of uncertainty related to changes in the value of investment securities, it is at least reasonably possible that changes in risks in the near term could materially affect participants' account balances and the amounts reported in the statement of net assets available for plan benefits and the statement of changes in net assets available for plan benefits. 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 additions and deductions during the reporting periods. Actual results could differ from those estimates. 3. Investments The Plan's investments, other than participant loans and the ADTRAN stock fund, are held in unallocated contracts or pooled separate accounts sponsored by the Custodian. Investments as of December 31, 1999 and 1998 and investment information for the year ended December 31, 1999 are as follows: 6 ADTRAN, Inc. 401(k) Employee Savings Plan Notes to Financial Statements For the Years Ended December 31, 1999 and 1998 - -------------------------------------------------------------------------------- Contract Value Contract Value At at December 31, December 31, Description 1999 1998 ----------- ------------- ------------- Unallocated contracts: Stable fund $ 3,027,543 $ 2,510,739 Pooled separate accounts: Money market fund 468,676 366,562 Equity income fund 3,351,984 2,757,748 Growth and income fund 5,602,578 3,122,701 Special equity fund 4,658,887 3,493,696 Intermediate government bond fund 800,615 623,948 Balanced fund 2,731,463 2,369,256 Government/Corporate bond fund 281,212 137,543 Short horizon SAF fund 98,885 76,207 Intermediate horizon SAF fund 956,735 751,679 Inter/Long horizon SAF fund 1,715,704 1,327,303 Government fixed fund 822,623 783,243 Stock index fund 1,171,975 261,480 ADTRAN stock fund 773,910 178,173 Participant loans 1,108,256 923,728 ----------- ----------- Total investments $27,571,046 $19,684,006 =========== =========== Interest and dividend income $ 261,664 =========== Net appreciation in market value of investments $ 3,559,026 =========== The following is a summary of assets held in excess of 5% of the Plan's net assets available for plan benefits at December 31, 1999 and 1998: 1999 1998 Stable fund $3,027,543 $2,510,739 Equity income fund $3,351,984 $2,757,748 Growth and income fund $5,602,578 $3,122,701 Special equity fund $4,658,887 $3,493,696 Balanced fund $2,731,463 $2,369,256 Inter/Long Horizon SAF fund $1,715,704 $1,327,303 7 ADTRAN, Inc. 401(k) Employee Savings Plan Notes to Financial Statements For the Years Ended December 31, 1999 and 1998 - -------------------------------------------------------------------------------- The Plan's investments (including investments bought and sold, as well as held, during the year) appreciated in value by $3,559,026 during the year ended December 31, 1999, as follows: Pooled separate accounts $ 3,136,133 ADTRAN stock fund 422,893 ------------ $ 3,559,026 ============ 4. Income Tax Status The Plan has received a favorable determination letter from the Internal Revenue Service stating that the Plan, as then designed, was in compliance with the applicable requirements of the Internal Revenue Code. Although the Plan has since been amended, the Plan administrator and the Plan's tax counsel believe that the Plan is operating in such a manner so as not to jeopardize its favorable tax status. Therefore, no provision for income taxes has been included in the Plan's financial statements. 5. Comparison of Financial Statements to Form 5500 Annually, the Company files, on behalf of the Plan, an information return (Form 5500) that includes financial information prepared on the basis of cash receipts and disbursements. The accompanying financial statements differ from the 1999 Form 5500 primarily due to the accrual of employer and employee contributions for financial statement reporting purposes. 8 Supplemental Schedule ADTRAN, Inc. 401(k) Employee Savings Plan Schedule of Assets Held for Investment Purposes As of the Year Ended December 31, 1999 - -------------------------------------------------------------------------------- c. Description of Investment Including b. Identity of Issuer, Borrower, Maturity Date, Rate of Interest, e. Current a. Lessor, or Similar Party Collateral, Par or Maturity Value Value - -- --------------------------------- --------------------------------------- ------------ * AUSA Life Insurance Company Unallocated contract with insurance company - Stable fund $3,027,543 * AUSA Life Insurance Company Pooled separate account - Money market fund 468,676 * AUSA Life Insurance Company Pooled separate account - Equity income fund 3,351,984 * AUSA Life Insurance Company Pooled separate account - Growth and income fund 5,602,578 * AUSA Life Insurance Company Pooled separate account - Special equity fund 4,658,887 * AUSA Life Insurance Company Pooled separate account - Intermediate government bond fund 800,615 * AUSA Life Insurance Company Pooled separate account - Balanced fund 2,731,463 * AUSA Life Insurance Company Pooled separate account - Government/Corporate bond fund 281,212 * AUSA Life Insurance Company Pooled separate account - Short horizon SAF fund 98,885 * AUSA Life Insurance Company Pooled separate account - Intermediate horizon SAF fund 956,735 * AUSA Life Insurance Company Pooled separate account - Inter/Long horizon SAF fund 1,715,704 * AUSA Life Insurance Company Pooled separate account - Government fixed fund 822,623 * Diversified Investment Pooled separate account - Stock Advisors index fund 1,171,975 * AUSA Life Insurance Company ADTRAN stock fund 773,910 * Diversified Investment Participant loans - rate of Advisors interest: 8.25% - 10% 1,108,256 ------------ $ 27,571,046 ============ * Party-in-interest to the Plan. 9