1 U.S. SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 ___________________ FORM 11-K (Mark One) [ X ] ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES AND EXCHANGE ACT OF 1934 (No Fee Required) For the fiscal year ended December 31, 1998 or [ ] TRANSITION REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 (No Fee Required) For the transition period from ____________________ to ____________________ Commission File Number 1-12432 A. Full title of the plan and the address of the plan, if different from that of the issuer named below: American Power Conversion Corporation 401(k) Plan B. Name of issuer of the securities held pursuant to the plan and the address of its principal executive office: American Power Conversion Corporation 132 Fairgrounds Road West Kingston, Rhode Island 02892 REQUIRED INFORMATION A. Financial Statements and Schedules Page ---- Independent Auditors' Report 4 Statements of Net Assets Available for Plan Benefits as of December 31, 1998 and 1997 5 Statements of Changes in Net Assets Available for Plan Benefits for the Years Ended December 31, 1998 and 1997 6 Notes to Financial Statements 7-13 Schedule I Line 27a - Schedule of Assets Held for Investment Purposes as of December 31, 1998 14 Schedule II Line 27d - Schedule of Reportable Transactions 15 B. Exhibit Listing Exhibit Description Number 23.1 Consent of KPMG LLP SIGNATURES The Plan. Pursuant to the requirements of the Securities Exchange Act of 1934, the trustees (or other persons who administer the employee benefitplan) have duly caused this annual report to be signed on its behalf by the undersigned hereunto duly authorized. AMERICAN POWER CONVERSION CORPORATION 401(K) PLAN (Name of Plan) Date: June 29, 1999 /s/ Donald M. Muir ------------------------------------------------- Donald M. Muir, Chief Financial Officer (principal financial and accounting officer) 2 AMERICAN POWER CONVERSION CORPORATION 401(k) PLAN Financial Statements and Schedules December 31, 1998 and 1997 (With Independent Auditors' Report Thereon) 3 AMERICAN POWER CONVERSION CORPORATION 401(k) PLAN Table of Contents Page Independent Auditors' Report 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 - 11 Schedules 1 Item 27a - Schedule of Assets Held for Investment Purposes12 2 Item 27d - Schedule of Reportable Transactions 13 Note:Schedules regarding nonexempt transactions, loans or fixed income obligations, leases in default or classified as un- collectible, and assets held for investment purposes which were both acquired and disposed of within the plan year, as required by Section 103(b)(3) of the Employee Retirement Income Security Act of 1974, have not been included herein as the information is not applicable. 4 INDEPENDENT AUDITORS' REPORT The 401(k) Plan Committee American Power Conversion Corporation: We have audited the accompanying statements of net assets available for plan benefits of the American Power Conversion Corporation 401(k) Plan as of December 31, 1998 and 1997, and the related statements of changes in net assets available for plan benefits for the year ended December 31, 1998 and the period from May 1, 1997 (date of inception) to December 31, 1997. 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 generally accepted auditing standards. 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 the American Power Conversion Corporation 401(k) Plan as of December 31, 1998 and 1997, and the changes in net assets available for plan benefits for the year ended December 31, 1998 and the period from May 1, 1997 (date of inception) to December 31, 1997, in conformity with generally accepted accounting principles. Our audits were made for the purpose of forming an opinion on the basic financial statements taken as a whole. The supplemental schedules of assets held for investment purposes and reportable transactions are presented for the purpose of additional analysis and are not a required part of the basic financial statements, but are 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. The supplemental schedules have been subjected to the auditing procedures applied in the audits of the basic financial statements as of December 31, 1998 and 1997 and for the year ended December 31, 1998 and the period from May 1, 1997 (date of inception) to December 31, 1997, and in our opinion, are fairly stated in all material respects in relation to the basic financial statements taken as a whole. /s/ KPMG LLP June 16, 1999 Providence, Rhode Island 5 AMERICAN POWER CONVERSION CORPORATION 401(k) PLAN Statements of Net Assets Available for Plan Benefits December 31, 1998 and 1997 1998 1997 Cash $2,104 46 Receivables: Employer's contribution 497,110 1,269,448 Accrued income 3,420 - Participants' contributions 9,061 - 511,695 1,269,494 Investments (note 3): American Power Conversion Corporation 4,713,068 409,330 Common Stock Investments in common/collective trusts: Merrill Lynch Equity Index Trust 3,803 - Merrill Lynch Retirement Preservation Trust 468,998 129,173 472,801 129,173 Mutual Funds: Blackrock Small Cap Growth 764,228 248,639 Alliance Bond Fund Corporate 354,253 132,690 Merrill Lynch Strategic Dividend Fund Class A 746,552 184,013 Merrill Lynch Growth Fund Class A 1,984,069 915,116 Ivy International Fund 1,107,297 456,146 MFS Massachusetts Investors Growth 14,961 - Merrill Lynch Basic Value Fund Class A 1,345,310 384,224 6,316,670 2,320,828 Loans to participants 113,403 35,420 Total investments 11,615,942 2,894,751 Net assets available for plan benefits $12,127,637 4,164,245 See accompanying notes to financial statements. 6 AMERICAN POWER CONVERSION CORPORATION 401(k) PLAN Statements of Changes in Net Assets Available for Plan Benefits For the year ended December 31, 1998 and for the period from May 1, 1997 (date of inception) to December 31, 1997 1998 1997 Additions to net assets attributed to: Investment income: Net realized gains (losses) $ (11,537) 2,615 Net unrealized gains (losses) 1,315,815 (156,639) Interest 6,888 957 Dividends 257,719 108,733 1,568,885 (44,334) Contributions: Participants 4,814,607 2,227,642 Employer 1,764,258 1,599,066 6,578,865 3,826,708 Total additions 8,147,750 3,782,374 Deductions from net assets attributed to: Benefits paid to participants 183,208 14,215 Total deductions 183,208 14,215 Net increase prior to transfers and other 7,964,542 3,768,159 Transfers from other plans (note 7) - 396,086 Other (1,150) - Net increase in net assets available for benefits 7,963,392 4,164,245 Net assets available for benefits: Beginning of year 4,164,245 - End of year $ 12,127,637 4,164,245 See accompanying notes to financial statements. 7 AMERICAN POWER CONVERSION CORPORATION 401(K) PLAN Notes to Financial Statements (1)Description of Plan The following brief description of the American Power Conversion Corporation 401(k) Plan (the "Plan") provides only general information. Participants should refer to the Plan agreement for a more complete description of the Plan's provisions. (a)General The Plan is a qualified defined contribution plan covering American Power Conversion Corporation (the "Company") employees who have completed at least 45 days of service with the Company. The Plan covers all employees working for the Company and the Participating Affiliates, APC America, Inc., APC Sales and Service Corporation and Systems Enhancement Corporation, except those employees who are members of a union who bargained separately for retirement benefits during negotiations. The Plan is subject to the provisions of the Employee Retirement Income Security Act of 1974 ("ERISA"). (b)Contributions The maximum salary savings (pre-tax) contribution that an employee may elect to contribute to the Plan is the lesser of 15% of annual gross compensation or the limit established by the IRS ($10,000 and $9,500 for 1998 and 1997, respectively). The Company may match this salary savings contribution at a rate of up to 100% of the first 3% of the participant's salary and wage compensation, excluding bonuses, commissions, incentive compensation, taxable fringe benefits, moving expenses, auto and other allowances, and disqualifying dispositions. During 1998 the Plan was amended to include bonuses in the definition of compensation. The Company may also make discretionary profit-sharing contributions to the Plan. All employer matching and profit-sharing contributions are deposited to the American Power Conversion Corporation Common Stock Fund. During 1998, the Company made a $952,954 profit sharing contribution for the 1997 Plan year. There were no discretionary contributions made for the 1998 Plan year. (c)Vesting Participants are fully vested to the extent of their salary savings contributions and earnings on those contributions. 8 Participants vest in Company contributions and the related earnings based on the following schedule: Percentage of Years of service vesting in employer contributions Less than two years 0% Two years 25% Three years 50% Four years 75% Five years 100% The first and/or last year in which the participant is employed by the Company will be counted for vesting purposes if the participant has more than 1,000 hours of service in that year. Participants also become fully vested in the employer contributions upon death, permanent disability, or upon attaining the age of 65. (d)Loans to Participants Participants may borrow from their vested account balance under certain circumstances as provided in the Plan agreement. The minimum loan amount is $1,000 and participants may borrow the lesser of 50% of their vested account balance or $50,000. Interest on loans is charged at the prevailing commercial interest rate for loans of a similar type with a repayment term not to exceed five years. This term can be extended if the loan is used for the purchase of the participant's primary residence. A participant may not have more than one loan outstanding at any time. (e)Distributions Upon termination from the Plan, a participant's vested accrued benefits in his or her account shall be distributed, as elected by the participant, in either a single lump-sum payment, or, provided the participant's vested account exceeds $5,000, in periodic installments not to exceed the participant's lifetime, or the joint lifetime of the participant and his/her spouse. Distributions may also be made in cash or in kind, or part cash and part in kind over a period not to exceed the participant's lifetime, or the joint lifetime of the participant and his/her spouse. (f)Hardship Withdrawal The Plan provides for hardship withdrawals, as defined by the Plan, of the participant's account. Participants who take a hardship withdrawal must be suspended from contributing to the Plan for a period of 12 months following the date of the withdrawal. 9 (g)Forfeitures Nonvested employer contributions are forfeited by a participant who terminates employment and are reallocated among remaining participants in the Plan. There were no forfeitures in 1998 and 1997. (2)Summary of Significant Accounting Policies (a)Basis of Presentation The accompanying financial statements of the Plan have been prepared using the accrual basis of accounting in accordance with generally accepted accounting principles. The preparation of financial statements in conformity with generally accepted accounting principles requires 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 to net assets available for benefits during the reporting period. Actual results could differ from those estimates. (b)Investments Investments are stated at aggregate fair market values, which are based principally on published market prices. Investment income is recognized when earned, and purchases and sales of securities are recorded on a trade-date basis. (c)Expenses All expenses of the Plan are paid by the Company in accordance with the Plan agreement. (d)Payment of Benefits Benefits are recorded when paid. 10 (3)Investments The Plan's investments are held in trust and managed by Merrill Lynch (ML). Participants may direct employer and employee contributions into any of the investment options listed below. The following table summarizes the investments held by Merrill Lynch at December 31, 1998. Investments representing 5% or more of net assets available for benefits are indicated by an asterisk (*). 1998 Fair Number market of value shares American Power Conversion Corporation Common Stock 194,606 $ 4,713,068* Merrill Lynch Equity Index Trust 45 3,803 Merrill Lynch Retirement Preservation Trust 468,998 468,998 Blackrock Small Cap Growth 35,595 764,228* Alliance Bond Fund Corporate 26,837 354,253 Merrill Lynch Strategic Dividend Fund Class A 54,612 746,552* Merrill Lynch Growth Fund Class A 92,239 1,984,069* Ivy International Fund 26,876 1,107,297* MFS Massachusetts Investor Growth 940 14,961 Merrill Lynch Basic Value Fund Class A 35,384 1,345,310* A brief description of each fund's investment objective follows: Merrill Lynch Equity Index Trust invests primarily in a portfolio of equity securities designed to match the performance of the S&P 500 Index. Merrill Lynch Retirement Preservation Trust seeks to provide preservation of capital, liquidity and current income at levels that are typically higher than those provided by money market funds. Blackrock Small Cap Growth is designed for investors aggressively seeking long-term growth from small company stocks, which may exhibit a higher degree of price volatility than stocks of larger companies with longer earnings histories. Alliance Bond Fund Corporate seeks income; capital appreciation is secondary. The fund normally invests at least 65% of assets in investment-grade debt securities. It may hold corporate bonds, convertibles, US government obligations, and dollar denominated foreign debt. Merrill Lynch Strategic Dividend Fund Class A provides shareholders with long-term total return by investing primarily in a diversified portfolio of dividend-paying common stocks that yield more than the Standard & Poor's 500 Composite Stock Price Index. Total return is the aggregate of income and capital value changes. 11 Merrill Lynch Growth Fund Class A seeks growth of capital and, secondarily, income through a diversified portfolio of primarily equity securities, with principal emphasis on issues believed by Fund management to be undervalued. Ivy International Fund seeks long-term capital growth; current income is a secondary consideration. The Fund normally invests at least 65% of assets in common stocks issued in at least three countries. MFS Massachusetts Investors Growth seeks to provide long-term growth of capital and future income rather than current income. The fund may invest up to 50% of its total assets in foreign securities, including securities of issuers located in developing markets. Merrill Lynch Basic Value Fund Class A seeks capital appreciation, and secondarily, income, by investing primarily in equities that appear to be undervalued. American Power Conversion Corporation common stock is offered to Plan participants as an additional investment option. Merrill Lynch purchases the shares in the open market at the time contributions are received. The timing of all stock transactions is subject to the availability of American Power Conversion Corporation common stock on the open market, and prices are set by the market. The number of shares shown in the above table have been adjusted to reflect a two-for-one stock split subsequent to year end. 12 (4) Detailed Changes in Net Assets Changes in net assets for the year ended December 31, 1998 were as follows: ML MFS ML American 		 ML 	Retire- Blackrock 	 ML 	 ML 		 Massa-	 Basic Power 		 Equity ment Small Cap Alliance Strategic Growth Ivy chusetts Value Conversion Partici 		 Index Preser- Growth Bond Fund Dividend Fund Intern'l Investors Fund Corporation pant Uninvested 		 Trust vation Fund Corporate Fund 	Class A Fund Growth Class A Common Stock Loans Cash 	 Total 				 Trust		 Class A Fund Additions to net assets attributable to: Investment income: Net realized gains(losses) $ - - (3,354) (701) (504) (49,581) (1,262) - 493 43,372 - - (11,537) Net unrealized gains(losses) 141 - 67,606 (16,022)(39,551) (353,484) 27,960 (334) 9,058 1,620,441 - - 1,315,815 Interest - 677 114 477 649 555 816 - 1,166 340 - 2,094 6,888 Dividends - 15,029 - 17,107 98,176 30,135 18,726 1,160 73,966 - - 3,420 257,719 141 15,706 64,366 861 58,770 (372,375) 46,240 826 84,683 1,664,153 - 5,514 1,568,885 Contributions: Participants 846 57,489 474,107 186,909 471,830 1,623,634 683,085 1,966 785,743 328,998 - - 4,814,607 Employer - - - - - - - - - 1,764,258 - - 1,764,258 846 257,489 474,107 186,909 471,830 1,623,634 683,085 1,966 785,743 2,093,256 - - 6,578,865 Total additions 987 273,195 538,473 187,770 530,600 1,251,259 729,325 2,792 870,426 3,757,409 - 5,514 8,147,750 Deductions from net assets attributable to: Benefits paid to participants - 15,860 14,767 3,043 2,007 58,364 9,289 - 9,737 45,855 23,930 356 183,208 Total deductions - 15,860 14,767 3,043 2,007 58,364 9,289 - 9,737 45,855 23,930 356 183,208 Net increase prior to transfers 987 257,335 523,706 184,727 28,593 1,192,895 720,036 2,792 860,689 3,711,554 (23,930) 5,158 7,964,542 Interfund transfers 2,842 84,620 (7,509) 37,376 34,847 (121,508) (67,659) 12,196 101,767 (179,154) 101,913 269 - Administrative expenses - (1,201) - - - - - - - - - 51 (1,150) 2,842 83,419 (7,509) 37,376 34,847 (121,508) (67,659) 12,196 101,767 (179,154) 101,913 320 (1,150) Net increase 3,829 340,754 516,197 222,103 563,440 1,071,387 652,377 14,988 962,456 3,532,400 77,983 5,478 7,963,392 Net assets available for benefits: Beginning of year - 129,173 248,639 132,690 184,013 915,116 456,146 - 384,224 1,678,778 35,420 46 4,164,245 End of year $3,829 469,927 764,836 354,793 747,453 1,986,503 1,108,523 14,988 1,346,680 5,211,178 113,403 5,524 12,127,637 13 (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. (6)Tax Status The Plan has not applied to the Internal Revenue Service for a tax determination letter to establish its tax-exempt status. However, in the opinion of the Plan's Administrator, the Plan has operated within the terms of the plan document and applicable regulations and is qualified under the Internal Revenue Code. (7)Plan Transfers Effective July 1, 1997, the Systems Enhancement Corporation 401(k) Savings Plan was merged into the Plan. Systems Enhancement Corporation was acquired by the Company in February 1997. 14 Schedule 1 AMERICAN POWER CONVERSION CORPORATION 401(k) PLAN Item 27a - Schedule of Assets Held for Investment Purposes December 31, 1998 Identity of issue, borrower, lessor or similar party Description of investment Cost Current Value *Merrill Lynch Equity Index Trust $ 3,661 3,803 *Merrill Lynch Retirement Preservation Trust 468,998 468,998 Blackrock Small Cap Growth 707,537 764,228 Alliance Bond Fund Corporate 370,606 354,253 *Merrill Lynch Strategic Dividend Fund Class A 788,134 746,552 *Merrill Lynch Growth Fund Class A 2,409,325 1,984,069 Ivy International Fund 1,104,395 1,107,297 MFS Massachusetts Investors Growth 15,296 14,961 *Merrill Lynch Basic Value Fund Class A 1,339,401 1,345,310 *American Power Conversion Corp. Common Stock 3,136,010 4,713,068 *Loans to participants Various loans with interest rates of 9% 113,403 113,403 $10,456,766 11,615,942 *Indicates a party-in-interest to the plan. See accompanying independent auditors' report. 15 Schedule 2 AMERICAN POWER CONVERSION CORPORATION 401(k) PLAN Item 27d - Schedule of Reportable Transactions For the year ended December 31, 1998 Current value of asset Identity of party Purchase Selling Cost of on transaction Net gain involved Description of Asset price price asset date or (loss) *Merrill Lynch Retirement Preservation Trust $ 437,399 - 427,399 437,399 - *Merrill Lynch Retirement Preservation Trust - 97,574 97,574 97,574 - Blackrock Small Capital Growth Fund 518,272 - 518,272 518,272 - Blackrock Small Capital Growth Fund - 66,936 70,290 66,936 (3,354) Alliance Bond Fund Corporate 260,005 - 260,005 260,005 - Alliance Bond Fund Corporate - 21,736 22,436 21,736 (700) *Merrill Lynch Strategic Dividend Fund Class A 632,600 - 632,600 632,600 - *Merrill Lynch Strategic Dividend Fund Class A - 30,006 30,510 30,006 (504) *Merrill Lynch Growth Fund Class A 1,707,491 - 1,707,491 1,707,491 - *Merrill Lynch Growth Fund Class A - 235,473 285,054 235,473 (49,581) Ivy International Fund 743,396 - 743,396 743,396 - Ivy International Fund - 118,943 120,205 - (1,262) *Merrill Lynch Basic Value Fund Class A 993,403 - 993,403 993,403 - *Merrill Lynch Basic Value Fund Class A - 41,868 41,375 - 493 *American Power Conversion Corp. Common Stock 2,919,493 - 2,919,493 2,919,493 - *American Power Conversion Corp. Common Stock - 274,979 231,607 274,979 43,372 * Indicates a party-in-interest to the plan. See accompanying independent auditors' report.