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 year ended December 31, 1999 MILLIPORE CORPORATION (Name of issuer of the securities held Pursuant to the Plan) 80 Ashby Road Bedford, Massachusetts 01730 (Address of the principal executive office of the issuer) SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934, the Committee has duly caused this Annual Report to be signed by the undersigned thereunto duly authorized. MILLIPORE CORPORATION EMPLOYEES' PARTICIPATION AND SAVINGS PLAN BY:/s/Jeffrey Rudin Jeffrey Rudin Committee for Administration of the Millipore Corporation Employees' Participation and Savings Plan Date: June 28, 2000 MILLIPORE CORPORATION EMPLOYEES' PARTICIPATION AND SAVINGS PLAN For the Year Ended December 31, 1999 MILLIPORE CORPORATION EMPLOYEES' PARTICIPATION AND SAVINGS PLAN Index to Financial Statements and Supplemental Schedules * Financial Statements and Exhibits Page(s) Report of Independent Accountants 1 Statements of Net Assets Available for Plan Benefits as of 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 - 10 Schedule of Assets Held for Investment Purposes as of December 31, 1999 11 * Other schedules required by 29 CFR 2520.103-10 of the Department of Labor's Rules and Regulations for Reporting and Disclosure under ERISA have been omitted as they are not applicable. Report of Independent Accountants To the Participants and Administrator of the Millipore Employees' Participation and 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 Millipore Employees' Participation and 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. 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, which 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, 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 of assets held for investment purposes 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 ("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 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. The schedule of assets held for investment purposes that accompanies the Plan's financial statements does not disclose the historical cost of non-participant directed Plan investments. This information is required by the Department of Labor's Rules and Regulations for Reporting and Disclosure under ERISA. Boston, Massachusetts June 7, 2000 MILLIPORE CORPORATION EMPLOYEES' PARTICIPATION AND SAVINGS PLAN STATEMENT OF NET ASSETS AVAILABLE FOR PLAN BENEFITS December 31, 1999 1998 Assets Investments, at fair value $167,071,339 $68,019,748 Plan's Interest in Master Trust, at fair value - 71,301,753 Participant loans receivable 3,778,798 3,878,006 Contributions receivable: Participation Account 5,016,613 5,008,340 Savings Account: Employee contributions - 783,841 Employer contributions - 112,770 Due from Pan American - 263,645 Total assets $175,866,750 $149,368,103 Liabilities and Net Assets Available for Plan Benefits Fund payables $ - $ 235,787 Due to AIM Ltd. Maturity - 263,645 Net assets available for plan benefits 175,866,750 148,868,671 Total liabilities and net assets available for plan benefits $175,866,750 $149,368,103 The accompanying notes are an integral part of the financial statements. MILLIPORE CORPORATION EMPLOYEES' PARTICIPATION AND SAVINGS PLAN STATEMENT OF CHANGES IN NET ASSETS AVAILABLE FOR PLAN BENEFITS For the year ended December 31, 1999 Investment income: Dividends on Millipore Common Stock $ 81,353 Dividends and interest 3,913,562 Net appreciation in fair value of investments 23,268,838 Investment Income 27,263,753 Contributions: Employer contributions: Participation Account 5,016,613 Savings Account 1,639,901 Employee Savings Account contributions 7,991,686 Total contributions 14,648,200 Benefit payments (14,901,819) Other expense (12,055) Net increase 26,998,079 Net assets available for plan benefits at January 1 148,868,671 Net assets available for plan benefits at December 31 $175,866,750 The accompanying notes are an integral part of the financial statements. MILLIPORE CORPORATION EMPLOYEES' PARTICIPATION AND SAVINGS PLAN Notes to Financial Statements A. Description of the Plan General The following description of the Millipore Corporation (the "Company") Employees' Participation and Savings Plan (the "Plan") provides only general information. Participants should refer to the Plan document for a more complete description of the Plan's provisions. The Plan is a defined contribution profit sharing plan subject to the provisions of the Employee Retirement Income Security Act of 1974 (ERISA) and was most recently amended and restated effective January 1, 1997. The Plan includes a profit sharing feature (the "Participation Account"), which covers U.S. and Puerto Rico employees who have at least two years of continuous service with the Company, and a savings feature (the "Savings Account"), which covers only U.S. employees. Eligible employees can contribute to the Savings Account upon service commencement date, the company match will commence after one year of continuous service. Effective August 1, 1999, T. Rowe Price Retirement Plan Service, Inc. replaced Watson Wyatt Worldwide as recordkeeper of the Plan. Effective August 1, 1999, T. Rowe Price Trust Company replaced Investor's Bank & Trust as trustee of the Plan. As a result of this change in Trustee, all new investment options were introduced with the exception of the Millipore Stock Fund and the Master Trust was dissolved. Funding Policy Under the Participation Account, the Company makes discretionary contributions to the Plan of a percentage of the Company's profits as designated by the Company's Board of Directors. Contributions are allocated to participants' accounts based on participants' compensation during the year for which the contribution is made and are invested in the Millipore Asset Allocation Fund. Prior to August 1, 1999, the Millipore Asset Allocation Fund was known as the Balanced Fund. Prior to August 1, 1999, the Participation Account was commingled in a Master Trust with the Retirement Plan for Employees of Millipore Corporation (the "Retirement Plan"), a separate plan sponsored by the Company. Under the Savings Account, participants may elect to contribute amounts ranging from 1% to 16% of their eligible compensation on a pre-tax basis subject to certain limitations. All participants with 10 or more years of service receive a Company match of 50% of their contribution up to 6% of their eligible compensation. Participants with less than 10 years of service receive a Company match of 25% of their contribution up to 6% of their eligible compensation. Contributions under the Savings Account and the Company's matching amount are invested as directed by the participants. Participants are permitted to invest in one or more of the investment vehicles offered, pursuant to the provisions of the Plan. MILLIPORE CORPORATION EMPLOYEES' PARTICIPATION AND SAVINGS PLAN Notes to Financial Statements A. Description of the Plan - (continued) Vesting All participants are fully vested in their entire balance. Investment Options A participant may direct contributions into any of the following investment options: T. Rowe Price Blue Chip Growth Fund T. Rowe Price Equity Index Trust T. Rowe Price Summit Cash Reserves Fund T. Rowe Price Balanced Fund Bankers Trust International Equity Fund Van Kampen Emerging Growth Fund, Class A Robert Stevens (RS) Emerging Growth Fund Pimco Total Return Fund Millipore Common Stock In addition to the above funds, there are investments from a plan acquired through a prior acquisition by the Company, which consists of Deposit Fund accounts held at Pan American Life Insurance Company. Employees cannot direct contributions to these Deposit Fund accounts. The Deposit Fund accounts hold guaranteed insurance contracts, which will mature over the next three years until 2002. Upon maturing, participants must direct such funds into the investment options mentioned above. Non-participant directed investments (Participation Account) are invested in the Millipore Asset Allocation Fund, formerly the Balanced Fund, which is composed of the following Grantham, Mayo, Van Otterloo Co., LLC ("GMO") mutual funds: GMO US Core Fund III GMO Domestic Bond Fund III GMO Small Cap Value Fund III GMO REIT Fund III GMO Small Cap Growth Fund III MILLIPORE CORPORATION EMPLOYEES' PARTICIPATION AND SAVINGS PLAN Notes to Financial Statements A. Description of the Plan - (continued) Participant Loans Participants may borrow from their fund accounts a minimum of $1,000 up to a maximum equal to the lesser of, (1) the amount of their total account (excluding the Participation Account), (2) the greater of $10,000 or one-half of their total account; or (3) $50,000 reduced by the excess (if any) of (a) the highest outstanding balance of loans from the Plan during the 1-year period ending on the day before the date on which such loan was made, over (b) the outstanding balance of loans from the Plan on the date on which such loan was made. Loan terms range from 1 to 5 years. Loan interest rates are updated monthly. As of December 31, 1999, interest rates on participant loans ranged from 5.5% to 10.5%. The entire amount of the participant's account serves as collateral for the loan. Payment of Benefits Participant's who are 59 1/2 years or older may, at any time, withdraw amounts contributed to the Plan by, or on behalf of them, including income earned. In the event of a participant's death, termination or retirement, all amounts contributed to the Plan by, or on behalf of the participant, including income earned, will be distributed in accordance with the provisions of the Plan. Participants may request a withdrawal from their account for certain hardships that result from medical expenses, expenses to purchase a principal residence, or tuition expense for the next 12 months of post secondary education for the participant, their spouse, children or dependents. The Committee for the Administration of the Savings Plus/Participation Plan and the Retirement Plan for the Employees of Millipore Corporation determines the existence of hardship. Participation Account contributions and income earned may be transferred to the Retirement Plan for distribution in accordance with its provisions, upon meeting certain requirements as outlined in the Plan document. B. Summary of Significant Accounting Policies Basis of Accounting The Plan's financial statements are prepared under the accrual basis of accounting. Investment Valuation Investments in the money market fund are valued at cost, which approximates fair market value. Investments in mutual funds are recorded at their net asset value, which approximates fair market value. Common stocks are valued at the last reported sales price on the last business day of the year. Participant loans are valued at principal plus accrued interest, which approximates fair value. Purchases and sales of investments are recorded on a trade date basis. MILLIPORE CORPORATION EMPLOYEES' PARTICIPATION AND SAVINGS PLAN Notes to Financial Statements B. Summary of Significant Accounting Policies - (continued) Net appreciation (depreciation) on fair value of investments includes realized gains and losses and unrealized appreciation (depreciation) on investments. In determining the net gain or loss on investments, cost is determined on the average cost basis. Use of Estimates The preparation of the financial statements in conformity with generally accepted accounting principles requires the Trustees to make significant estimates and assumptions that affect the reported amounts of net assets available for plan benefits and disclosure of contingent assets and liabilities at the date of the financial statements and the changes in net assets available for plan benefits during the reporting period. Actual results could differ from those estimates. Risks and Uncertainties The Plan provides for various investment options in any combination of stocks, bonds, fixed income securities, mutual funds, money market funds, 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 a 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, 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. Investment Income Dividend income is recorded on the ex-dividend date. Interest income is recorded on an accrual basis. Contributions Contributions from the Company under the Participation Account are accrued and paid annually based upon a determination by the Board of Directors of the Company in accordance with the provisions of the Plan. Payment of Benefits Benefits payments are recorded when paid. Reclassifications Certain reclassifications were made to the prior year statement net of assets available for plan benefits in order to adopt the provisions of Statement on Position 99-3, Accounting for and Reporting of Certain Defined Contribution Plan Investments and Other Disclosure Matters. MILLIPORE CORPORATION EMPLOYEES' PARTICIPATION AND SAVINGS PLAN Notes to Financial Statements C. Investments The following table presents investments that represent 5 percent or more of the Plan's net assets as of December 31: 1999 1998 GMO US Core Fund III* $ 32,938,437 $ 38,983,437 GMO Domestic Bond Fund III* 26,266,889 30,244,229 T. Rowe Price Equity Index Trust 19,654,715 - Van Kampen Emerging Growth Fund, Class A 17,973,802 - T. Rowe Price Balanced Fund 16,307,737 - T. Rowe Price Blue Chip Growth Fund 12,996,690 - T. Rowe Price Summit Cash Reserves Fund 12,322,184 - Millipore Common Stock 10,777,402 6,968,924 Vanguard Index TR500 Portfolio - 15,772,342 Investment Co. of America - 10,820,078 Dodge & Cox Balanced Fund - 9,277,315 AIM Equity FDS Constellation - 9,144,542 AIM Ltd. Maturity Treasury Shares - 6,969,038 * Non-participant directed During the year ended December 31, 1999, the Plan's investments (including gains and losses on investments bought and sold, as well as held during the year) appreciated in value as follows: Mutual Funds $ 20,833,165 Common Stock $ 2,435,673 MILLIPORE CORPORATION EMPLOYEES' PARTICIPATION AND SAVINGS PLAN Notes to Financial Statements D. Non-Participant Directed Investments Information about the net assets and the significant components of the changes in net assets relating to the non- participant directed investments, the Participation Account, is as follows: December 31, 1999 1998 Net Assets: Mutual Funds $ 73,803,889 $ 69,146,431 Year Ended December 31, 1999 Change in Net Assets: Contributions $ 5,016,613 Earnings 5,446,357 Benefits paid to Participants (5,805,512) Net change in assets $ 4,657,458 E. Interest in Master Trust Prior to August 1, 1999, the assets of the Balanced Fund of the Plan and of the Retirement Plan were commingled and jointly invested in a Master Trust. The Participation and Savings Accounts' share of these investments were presented as `Interest in Master Trust' in the prior year financial statements. Interest in Master Trust consisted of contributions, net of benefits paid and a pro rata share of income earned of approximately 88.5% at December 31, 1998. Total mutual fund investments in the Master Trust as of December 31, 1998 were $80,608,430. Subsequent to August 1, 1999, the assets are no longer commingled. Income earned on commingled investments of the Master Trust for the period ended July 31, 1999 was as follows: Interest and dividends $1,427,152 Net depreciation of investments (1,119,814) Investment income $ 307,338 Investment income relating to the Master Trust was allocated to the individual plans based upon the pro rata share and was reported in net appreciation in fair value of investments in the Statement of Changes in Net Assets Available for Plan Benefits. MILLIPORE CORPORATION EMPLOYEES' PARTICIPATION AND SAVINGS PLAN Notes to Financial Statements F. Reconciliation of Financial Statements to Form 5500 The following is a reconciliation of net assets available for plan benefits per the financial statements to the Form 5500 at December 31: 1999 1998 Net assets available for plan benefits per the financial statements $175,866,750 $148,868,671 Amounts allocated to withdrawing participants ( - ) (2,618,508) Net Assets available for plan benefits per the Form 5500 $175,866,750 $146,250,163 The following is a reconciliation of benefit payments per the statement of changes in net assets available for plan benefits to the Form 5500 for the year ended December 31, 1999: Benefit payments per the statement of changes in net assets available for plan benefits $ 14,901,819 Less: Amounts allocated to withdrawing participants at December 31, 1998 (2,618,508) Benefits paid to participants per the Form 5500 $ 12,283,311 Amounts allocated to withdrawing participants are recorded on the Form 5500 as benefits payable and represent benefit claims that have been processed and approved for payment prior to December 31 but not yet paid as of that date. G. Plan Termination While the Company has not expressed any intent to discontinue its contribution to the Plan, it is free to do so at any time under the current provisions of the Plan. In the event of a permanent discontinuance of Company contributions to the Plan, dissolution of the Company, acquisition of the Company by an unaffiliated Company or vote by the Company's Board of Directors to discontinue the Plan, the Plan shall be deemed terminated and each participant shall be entitled to an immediate distribution of their account. H. Tax Status The Internal Revenue Service has determined and informed the Company by a letter dated May 15, 2000, that the Plan is designed in accordance with applicable sections of the Internal Revenue Code. Therefore, no provision for income taxes has been included in the Plan's financial statements. MILLIPORE CORPORATION EMPLOYEES' PARTICIPATION AND SAVINGS PLAN Schedule of Assets Held for Investment Purposes as of December 31, 1999** Fair Security Description Units Value Millipore Asset Allocation Fund GMO US Core Fund III * 1,894,102 $ 32,938,437 GMO Domestic Bond Fund III * 2,902,419 26,266,889 GMO Small Cap Value Fund III * 296,181 3,758,541 GMO REIT Fund III * 371,932 3,153,985 GMO Small Cap Growth und III * 190,753 2,685,809 $ 68,803,661 * Non-participant directed ** Cost information which is required was not available CONSENT OF INDEPENDENT ACCOUNTANTS We hereby consent to the incorporation by reference in the Registration Statement on Form S-8 (No.2-85698) of Millipore Corporation of our report dated June 7, 2000, relating to the financial statements of Millipore Corporation Employees' Participation and Savings Plan, which appears in this Form 11-K. PricewaterhouseCoopers LLP Boston, Massachusetts June 7, 2000