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, 1998 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, 1999 MILLIPORE CORPORATION EMPLOYEES' PARTICIPATION AND SAVINGS PLAN For the Year Ended December 31, 1998 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, with Fund Information, at December 31, 1998 and 1997 2 - 5 Statement of Changes in Net Assets Available for Plan Benefits, with Fund Information, for the year ended December 31, 1998 6 - 7 Notes to Financial Statements 8 - 17 Line 27a - Schedule of Assets Held for Investment Purposes as of December 31, 1998 18 - 19 Line 27d - Schedule of Reportable Transactions for the year ended December 31, 1998 20 Consent of Independent Accountants 21 Report of Independent Accountants To the Trustees of the Millipore Corporation 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 benefits of the Millipore Corporation Employees' Participation and Savings Plan as of December 31, 1998 and 1997, and the changes in net assets available for benefits for the year ended December 31, 1998 in conformity with generally accepted accounting principles. 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 generally accepted auditing standards 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. 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. Our audits were made for the purpose of forming an opinion on the basic financial statements taken as a whole. The supplemental schedules of (1) assets held for investment purposes and (2) 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 Fund Information in the statements of net assets available for plan benefits and the statement of changes in net assets available for plan benefits is presented for purposes of additional analysis rather than to present the net assets available for plan benefits and changes in net assets available for plan benefits of each fund. The supplemental schedules and Fund Information have been subjected to the auditing procedures applied in the audits of the basic financial statements and, in our opinion, are fairly stated in all material respects in relation to the basic financial statements taken as a whole. Boston, Massachusetts PricewaterhouseCoopers LLP May 19, 1999, except for Note H, for which the date is June 17, 1999 1 MILLIPORE CORPORATION EMPLOYEES' PARTICIPATION AND SAVINGS PLAN STATEMENTS OF NET ASSETS AVAILABLE FOR PLAN BENEFITS, WITH FUND INFORMATION December 31, 1998 and 1997 1998 Millipore AIM Ltd. F&G Invest. Co. Stock Maturity Balanced GAC of America Loan Fund Fund Fund Fund Fund Fund Assets Investments $7,073,821 $ 7,193,075 $ - $2,708,358 $10,889,113 $ - Plan's Interest in Master Trust - - 71,301,753 - - - Participant loan receiv. - - - - - 3,878,006 Contributions receivable: Participation - - 5,008,340 - - - Plan Savings Plan: Employee 117,380 68,559 63,901 29,348 103,158 - contrib. Employer 10,106 8,802 13,946 4,337 13,698 - contrib. Due from Pan American - 263,645 - - - - Total assets $7,201,307 $ 7,534,081 $76,387,940 $2,742,043 $11,005,969 $3,878,006 Liabilities and Net Assets Available for Plan Benefits Fund payables $35,674 $38,042 $ 37,208 $28,609 $ 20,195 $ - Due to AIM - - - - - - Ltd. Maturity Net assets available for 7,165,633 7,496,039 76,350,732 2,713,434 10,985,774 3,878,006 plan benefits Total liabilities and net assets $7,201,307 $7,534,081 $76,387,940 $2,742,043 $11,005,969 $3,878,006 available for plan Benefits The accompanying notes are an integral part of the financial statements. 2 MILLIPORE CORPORATION EMPLOYEES' PARTICIPATION AND SAVINGS PLAN STATEMENTS OF NET ASSETS AVAILABLE FOR PLAN BENEFITS, WITH FUND INFORMATION (continued) December 31, 1998 and 1997 1998 Invesco Dodge & Vanguard AIM Warburg Stable Cox S&P Constell- Pincus Value Balanced Index ation Int'l Fund Fund Fund Fund Equity Other Total Fund Assets Investments $2,184,625 $9,311,760 $15,942,455 $9,158,459 $2,314,095 $1,243,987 $68,019,748 Plan's Interest - - - - - - 71,301,753 in Master Trust Participant - - - - - - 3,878,006 loan receiv. Contributions receivable: Participation - - - - - - 5,008,340 Plan Savings Plan: Employee 18,761 84,058 178,124 93,960 26,592 - 783,841 contrib. Employer 3,332 15,433 23,758 14,919 4,439 - 112,770 contrib. Due from Pan American - - - - - - 263,645 Total assets $2,206,718 $9,411,251 $16,144,337 $9,267,338 $2,345,126 $ 1,243,987 $149,368,103 Liabilities and Net Assets Available for Plan Benefits Fund payables $ 643 $27,762 $25,248 $18,868 $ 3,538 $ - $235,787 Due to AIM - - - - - 263,645 263,645 Ltd. Maturity Net assets available for 2,206,075 9,383,489 16,119,089 9,248,470 2,341,588 980,342 148,868,671 plan benefits Total liabilities and net $2,206,718 $9,411,251 $16,144,337 $9,267,338 $2,345,126 $1,243,987 $149,368,103 assets available for plan Benefits The accompanying notes are an integral part of the financial statements. 3 MILLIPORE CORPORATION EMPLOYEES' PARTICIPATION AND SAVINGS PLAN STATEMENTS OF NET ASSETS AVAILABLE FOR PLAN BENEFITS, WITH FUND INFORMATION December 31, 1998 and 1997 1997 Millipore AIM Ltd. F&G Invest. Stock Maturity Balanced GAC Co. Loan Fund Fund Fund Fund of America Fund Fund Assets Investments $3,863,927 $7,009,476 $ - $2,501,073 $8,039,304 $ - Plan's Interest in - - 60,545,279 - - - Master Trust Participant - - - - - 3,555,608 loan receiv. Contributions receivable: Participation - - 5,105,012 - - - Plan Savings Plan: Employee 57,914 87,683 48,004 24,542 65,694 - contrib. Employer 18,280 19,961 16,001 8,180 21,274 - contrib. Due from Pan American - 289,905 - - - - Total assets $3,940,121 $7,407,025 $65,714,296 $2,533,795 $8,126,272 $3,555,608 Liabilities and Net Assets Available for Plan Benefits Fund payables $ 878 $ 780 $ 8,414 $ 402 $ 997 $ - Due to AIM - - - - - - Ltd. Maturity Net assets available for 3,939,243 7,406,245 65,705,882 2,533,393 8,125,275 3,555,608 plan benefits Total liabilities and net assets $3,940,121 $7,407,025 $65,714,296 $2,533,795 $8,126,272 $3,555,608 available for plan benefits The accompanying notes are an integral part of the financial statements. 4 MILLIPORE CORPORATION EMPLOYEES' PARTICIPATION AND SAVINGS PLAN STATEMENTS OF NET ASSETS AVAILABLE FOR PLAN BENEFITS, WITH FUND INFORMATION (continued) December 31, 1998 and 1997 1997 Invesco Dodge & Vanguard AIM Warburg Stable Cox S&P Constell- Pincus Value Balanced Index ation Int'l Fund Fund Fund Fund Equity Other Total Fund Assets Investments $1,490,652 $8,352,240 $8,632,236 $8,269,517 $2,482,717 $1,746,685 $52,387,827 Plan's Interest in Master - - - - - - 60,545,279 Trust Participant - - - - - - 3,555,608 loan receiv. Contributions receivable Participation - - - - - - 5,105,012 Plan Savings Plan: Employee 15,956 80,843 182,746 85,565 11,605 - 660,552 contrib. Employer 5,319 24,372 34,374 27,385 10,005 - 185,151 contrib. Due from Pan American - - - - - - 289,905 Total assets $1,511,927 $8,457,455 $8,849,356 $8,832,467 $2,504,327 $1,746,685 $122,729,334 Liabilities and Net Assets Available for Plan Benefits Fund payables $ 351 $ 936 $ 849 $ 1,081 $ 392 $ - $15,080 Due to AIM - - - - - 289,905 289,905 Ltd. Maturity Net assets available for 1,511,576 8,456,519 8,848,507 8,381,386 2,503,935 1,456,780 122,424,349 plan benefits Total liabilities and net assets $1,511,927 $8,457,455 $8,849,356 $8,382,467 $2,504,327 $1,746,685 $122,729,334 available for plan Benefits The accompanying notes are an integral part of the financial statements. 5 MILLIPORE CORPORATION EMPLOYEES' PARTICIPATION AND SAVINGS PLAN STATEMENT OF CHANGES IN NET ASSETS AVAILABLE FOR PLAN BENEFITS, WITH FUND INFORMATION For the year ended December 31, 1998 Millipore AIM Ltd. F&G Invest. Co. Stock Maturity Balanced GAC of America Loan Fund Fund Fund Fund Fund Fund Investment income: Dividends on Millipore $76,621 $ - $ - $ - $ - $ - Common stock Plan's Interest in Master Trust - - 8,448,579 - - - Invest. Income (Note D) Dividends and 2,140 356,403 - 95,839 255,102 215,438 interest Net appreciation in fair value of 280,207 64,914 - - 1,678,240 - investments Investment income 358,968 421,317 8,448,579 95,839 1,933,342 215,438 Contributions: Company contributions: Participation - - 5,008,340 - - - Plan Savings Plan 141,751 129,100 140,381 62,999 205,888 - Employee Savings Plan 581,955 464,551 588,030 335,739 982,744 3,292 contributions Transfer from Span - 1,726,245 - - - - Total 723,706 2,319,896 5,736,751 398,738 1,188,632 3,292 contributions Benefit payments (141,522) (1,045,940) (3,203,642) (153,064) (387,281) (197,642) Other (expense) (1,526) (946) - (803) (2,027) - income Loans to 63,493 (135,760) (31,625) (47,102) (15,285) 301,310 participants, net Participant 2,223,271 (1,468,773) (305,213) (113,567) 143,118 - interfund trsfs. Net increase 3,226,390 89,794 10,644,850 180,041 2,860,499 322,398 (decrease) Net assets available for plan benefits 3,939,243 7,406,245 65,705,882 2,533,393 8,125,275 3,555,608 at Jan. 1 Net assets available for $7,165,633 $7,496,039 $76,350,732 $ 2,713,434 $10,985,774 $3,878,006 plan benefits at Dec. 31 The accompanying notes are an integral part of the financial statements. 6 MILLIPORE CORPORATION EMPLOYEES' PARTICIPATION AND SAVINGS PLAN STATEMENT OF CHANGES IN NET ASSETS AVAILABLE FOR PLAN BENEFITS, WITH FUND INFORMATION (continued) For the year ended December 31, 1998 Invesco Dodge & Vanguard AIM Warburg Stable Cox S&P Index Constell- Pincus Value Balanced Fund ation Int'l Other Total Fund Fund Fund Equity Fund Investment income: Dividends on Millipore $ - $ - $ - $ - $ - $ - $76,621 Common stock Plan's Interest in Master Trust Invest. - - - - - - 8,448,579 Income (Note D) Dividends and 105,495 413,920 186,332 3,194 1,287 82,232 1,717,382 interest Net appreciation in fair value - 124,584 2,855,288 1,464,650 114,056 - 6,581,939 of investments Investment 105,495 538,504 3,041,620 1,467,844 115,343 82,232 16,824,521 income Contributions: Company contributions: Participation - - - - - - 5,008,340 Plan Savings Plan 48,279 254,920 354,524 250,481 83,637 - 1,671,960 Employee Savings Plan 239,828 1,174,468 2,329,192 1,169,228 422,356 - 8,291,383 contributions Transfer from Span - - - - - - 1,726,245 Total 288,107 1,429,388 2,683,716 1,419,709 505,993 - 16,697,928 contributions Benefit (135,319) (379,034) (586,903) (400,507) (132,284) (296,795) (7,059,933) payments Other (5,531) (1,114) 192 (974) (509) (4,956) (18,194) (expense)income Loans to (11,658) (68,844) (51,338) 7,971 (11,162) - - participants, net Participant interfund 453,405 (591,930) 2,183,295 (1,626,959) (639,728) (256,919) - trsfs. Net increase 694,499 926,970 7,270,582 867,084 (162,347) (476,438) 26,444,322 (decrease) Net assets available for plan benefits 1,511,576 8,456,519 8,848,507 8,381,386 2,503,935 1,456,780 122,424,349 at Jan. 1 Net assets available for $2,206,075 $9,383,489 $16,119,089 $ 9,248,470 $2,341,588 $ 980,342 $148,868,671 plan benefits at Dec. 31 The accompanying notes are an integral part of the financial statements. 7 MILLIPORE CORPORATION EMPLOYEES' PARTICIPATION AND SAVINGS PLAN Notes to Financial Statements A. Description of the Plan The Millipore Corporation Employees' Participation and Savings Plan-"1994 Restatement" as amended, (the Plan) is subject to the provisions of the Employee Retirement Income Security Act of 1974 (ERISA). The Plan includes a profit participation feature (Participation Plan), which covers U.S. and Puerto Rico employees who have at least two years of continuous service with Millipore Corporation (the Company), and a savings plan feature (Savings Plan), which covers only U.S. employees. Employees can contribute to the plan immediately, the company match will commence after one year of continuous service. The Plan is administered by a Committee (the Committee), appointed by the Board of Directors of the Company. The Plan was amended in April 1997 to include employees of the Amicon Separation Science Business of W.R. Grace and Co. (Amicon) which was acquired by Millipore on December 30, 1996 and employees of Tylan General,Inc.(Tylan) and its subsidiary Span Instruments Inc., which merged with Millipore on January 22, 1997. The committee voted on April 7, 1997 to transfer the assets of the Tylan General, Inc. Incentive Savings Plan (the Tylan Plan) and the Span Instruments 401k Plan (the Span Plan) into the Plan. Effective June 1, 1997, benefits ceased to accrue under the Tylan Plan and the Span Plan. The net assets of the Tylan Plan and the Span Plan were subsequently transferred to the Plan as of June 30, 1997 (the "Plan Merger date") and July 31,1998, respectively. All Amicon and Tylan employees became eligible for the purposes of participating in the Participation Plan contribution on the latest of the following dates: the date the employee completes two years of service, the date the employee becomes an eligible employee or the acquisition or merger date. All Amicon and Tylan employees have been given credit for all continuous service with Amicon or Tylan as if it were service with the Company for the purposes of determining eligiblity for benefits and the amounts of any Savings Plan matching contributions. All Amicon employees became eligible employees in the Savings Plan on the later of the acquisition date or the date of their employment with the Company, for the purposes of making Savings Plan contributions and receiving Savings Plan matching contributions. All Tylan employees became eligible for making Savings Plan contributions and receiving Savings Plan matching contributions on the Plan Merger date, provided the Tylan employee was otherwise an eligible employee as defined by the Plan. Under the Participation Plan, 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 Balanced Fund. The Participation Plan is integrated with the Retirement Plan for Employees of Millipore Corporation (Retirement Plan), a separate plan, which provides guaranteed retirement income levels to the extent such income levels are not provided by the Participation Plan. 8 MILLIPORE CORPORATION EMPLOYEES' PARTICIPATION AND SAVINGS PLAN Notes to Financial Statements (continued) A. Description of the Plan (continued) Under the Savings Plan, participants may make voluntary contributions of up to 15% of their eligible compensation on a pre-tax basis. 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 Plan and the Company's matching amount may be invested, at the participants' election, in any of the funds available in the Plan. Participants are permitted to invest in more than one fund and are generally allowed to borrow from the Plan the amounts contributed by them and the Company's matching amount. Borrowings are evidenced by interest bearing promissory notes and are reflected in the Loan Fund net of principal repayments. All interest payments are credited to the participant's account. 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 Plan 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 4 1/2 years. Each loan shall bear interest at a standard rate established by the Committee. The current interest rate is 5.5 percent. All contributions (both employee and employer), and income earned, under both sections of the Plan, are fully and immediately vested. Participants who are 59 1/2 years or older may at any time withdraw amounts contributed by them as well as 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 a lump sum to the participant or beneficiary. Participation Plan contributions in some cases and income earned may be transferred to the Retirement Plan for distribution in accordance with its provisions. A detailed description of the Plan is available upon request at the Company's headquarters in Bedford, Massachusetts. 9 MILLIPORE CORPORATION EMPLOYEES' PARTICIPATION AND SAVINGS PLAN Notes to Financial Statements (continued) B. Summary of Significant Accounting Policies Basis of Accounting The financial statements of the Plan are prepared under the accrual method of accounting. Investment Valuation Money market funds are valued at cost, which approximates fair market value. 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 cost which approximates fair value. The F&G GAC Fund is a fully benefit-responsive contract fund, which carries no set limitations. The minimum credited interest rate for the years ended December 31, 1998 and 1997 was 4.5%. This rate is reviewed annually to reflect the anticipated yields. The average yield for the years ended December 31, 1998 and 1997 was also 4.5%. The Other Fund consists of a series of fully benefit-responsive insurance contracts, with certain limitations on liquidation for purposes outside of plan provisions. The minimum credited interest rate and the average yield was 6.37% and 6.55% for the years ended December 31, 1998 and December 31, 1997 respectively. All investments in insurance contracts are valued at their contract value, which approximates fair value. The Invesco Stable Value Fund is a common collective trust GIC Fund (or pooled GIC Fund) which has been valued by the Fund's investment advisor, in the absence of a readily ascertainable market value, based on the best information available as of the end of the period. Such valuation has been approved by the Committee. Purchases and sales of securities are recorded on a trade date basis. Realized gains and losses on sales of securities are based on average cost. The Plan presents in the statement of changes in net assets available for plan benefits the net appreciation (depreciation) in the fair value of its investments which consists of the realized gains or losses and the unrealized appreciation (depreciation) on those investments. 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 at the date of the financial statements and the changes in net assets available for plan benefits during the reporting period and, when applicable, disclosures of contingent assets and liabilities at the date of the financial statements. Actual results could differ from those estimates. 10 MILLIPORE CORPORATION EMPLOYEES' PARTICIPATION AND SAVINGS PLAN Notes to Financial Statements (continued) B. Summary of Significant Accounting Policies (continued) 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. Dividend and Interest Income Dividend income is recorded on the ex-dividend date. Interest income is recorded as earned on an accrual basis. Contributions Contributions from the Company under the Participation Plan 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 are recorded when paid. C. Investment Programs The Plan's assets are invested among ten investment funds, a loan fund and a temporary fund (the Other Fund) which holds the remaining Tylan General employees' balances not yet transferred into the other ten investment funds. All of the investment funds available to employees have been approved by the Trustees of the Plan. Employees are allowed to invest in all ten investment funds and may invest in more than one fund. Upon enrollment in the Plan, a participant may direct employee contributions and matching company contributions, as well as change their investment options monthly. All Company contributions to the Participation Plan are invested in the Balanced Fund. The mix of investments within the Balanced Fund is determined by the Trustees of the Plan. Income earned by each investment fund, including realized and unrealized gains and losses on investments, is allocated to participants' accounts based on their pro rata share of contributions and income earned. The investment funds (see also Note H) available to employees are as follows: 11 MILLIPORE CORPORATION EMPLOYEES' PARTICIPATION AND SAVINGS PLAN Notes to Financial Statements (continued) C. Investment Programs (continued) Millipore Common Stock Fund: This fund's investments consist of Millipore Common Stock. AIM LTD Maturity Fund: This fund invests exclusively in U.S. Treasury Securities. The Fund's investment strategy is designed to provide a high level of principal protection. Balanced Fund: Investments of this fund include money market funds and mutual funds and are intended to provide a mixture of capital growth and income. F&G GAC Fund: Investments of this fund include a guaranteed annuity contract with a fixed rate of interest which is determined annually. Investment Co. of America Fund: This fund seeks long term growth of capital and income. The fund invests primarily in common stocks but may also invest in high-quality convertibles and debt securities. Invesco Stable Value Fund: This fund seeks stability of principal and consistent income through an actively managed pool of investment contracts. Dodge & Cox Balanced Fund: This fund seeks regular income, conservation of principal and long-term growth. The fund invests in a diversified portfolio of common stocks, preferred stocks and bonds. Vanguard S&P Index Fund: This fund invests primarily in stocks and seeks to match the investment performance of the Standard & Poor's 500 Composite Stock Price Index, an index emphasizing large company stocks. AIM Constellation Fund: This fund seeks capital appreciation. The fund invests in small and medium size emerging growth companies. 12 MILLIPORE CORPORATION EMPLOYEES' PARTICIPATION AND SAVINGS PLAN Notes to Financial Statements (continued) C. Investment Programs (continued) Warburg Pincus International Equity Fund: This fund seeks long-term capital appreciation by investing primarily in a broadly diversified portfolio of equity securities of companies that have their principal business activities and interests outside the U.S. Loan Fund: This fund consists of amounts borrowed by participants less principal repayments. Loans to participants are reflected as an increase in Loan Fund equity and as a decrease in the equity of the investment fund from which the loan was made. Repayments, conversely, reduce loan fund equity and increase the respective investment fund's equity. Interest paid to the Plan on loans to participants is credited to the borrower's account in the investment fund to which repayments are allocated. Other Fund: This is the remaining Tylan Plan balance which has not been invested within the Company's ten investment fund options as of December 31, 1998. It consists of a series of Deposit Fund accounts which are held at Pan American Life Insurance Company. Employees can no longer contribute to these Deposit Funds. There are four Deposit Funds remaining and they will be maturing over the next four years to be fully matured in 2002. As these contracts mature, the former Tylan employees will be required to transfer these assets to one or more of the Plan's ten investment fund options. Significant Investments The following table presents investments that represent 5 percent or more of the Plan's total net assets (excluding the Master Trust Investments) as of December 31, 1998 and 1997. 1998 1997 Vanguard Index TR500 Portfolio $15,772,342 $8,619,344 Investment Co. of America 10,820,078 8,039,304 Dodge & Cox Balanced Fund 9,277,315 8,337,260 AIM Equity FDS Constellation 9,144,542 8,267,363 AIM Ltd. Maturity Treasury Shares 6,969,038 6,785,250 Millipore Common Stock Fund 6,968,924 3,863,927 13 MILLIPORE CORPORATION EMPLOYEES' PARTICIPATION AND SAVINGS PLAN Notes to Financial Statements (continued) C. Investment Programs (continued) Participant and Non-Participant Directed Investment Programs All fund options are participant-directed except for the Balanced Fund. The following is a schedule of the Balanced Fund's statements of net assets available for plan benefits and statement of changes in net assets. December 31, 1998 December 31, 1997 Participant Nonparticipant Participant Nonparticipant Balanced Fund Directed Directed Total Directed Directed Total Assets Interest in $7,130,175 $64,171,578 $71,301,753 $6,054,528 $54,490,751 $60,545,279 Master Trust Contribution Receivable: Participation Plan - 5,008,340 5,008,340 - 5,105,012 5,105,012 Savings Plan: Employee contribution 63,901 - 63,901 48,004 - 48,004 Employer contribution 13,946 - 13,946 16,001 - 16,001 Total assets $7,208,022 $69,179,918 $76,387,940 $6,118,533 $59,595,763 $65,714,296 Liabilities & Net Assets Available for Plan Benefits Fund payables $3,721 $33,487 $ 37,208 $841 $7,573 $8,414 Net assets available for plan 7,204,301 69,146,431 76,350,732 6,117,692 59,588,190 65,705,882 benefits Total liabilities & net $7,208,022 $69,179,918 $76,387,940 $6,118,533 $59,595,763 $65,714,296 Assets available for plan benefits December 31, 1998 Participant Nonparticipant Balanced Fund Directed Directed Total Plan Interest in Master Trust Income $823,442 $7,625,137 $8,448,579 Company contributions: Participation plan - 5,008,340 5,008,340 Savings plan 140,381 - 140,381 Employee savings plan Contributions 588,030 - 588,030 Benefit Payments (128,406) (3,075,236) (3,203,642) Loans to participants, net (31,625) - (31,625) Participant interfund (305,213) - (305,213) transfers Net increase 1,086,609 9,558,241 10,644,850 Net assets available for plan benefits at Jan. 1 6,117,692 59,588,190 65,705,882 Net assets available for plan benefits at Dec. 31 $7,204,301 $69,146,431 $76,350,732 14 MILLIPORE CORPORATION EMPLOYEES' PARTICIPATION AND SAVINGS PLAN Notes to Financial Statements (continued) D. Interest in Master Trust The assets of the Balanced Fund and of the Retirement Plan are commingled and jointly invested in a Master Trust. The Balanced Fund's share of these investments are presented as Interest in Master Trust. Interest in Master Trust consists of contributions, net of benefits paid and a pro rata share of income earned of approximately 88.5% and 87.4% of the Master Trust at December 31, 1998 and 1997, respectively. 1998 1997 Fair Value Fair Value Total mutual fund $80,608,430 $69,289,140 investments Portion attributable to $71,301,753 $60,545,279 the Plan Income earned on commingled investments of the Master Trust for the year ended December 31, 1998 is as follows: Interest and dividends $12,391,073 Net depreciation of (2,786,641) investments Other expense (29,708) Total net investment income $9,574,724 Portion attributable to the $8,448,579 Plan Investment income and administrative expenses relating to the Master Trust are allocated to the individual plans based upon their pro rata share. 15 MILLIPORE CORPORATION EMPLOYEES' PARTICIPATION AND SAVINGS PLAN Notes to Financial Statements (Continued) E. 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: 1998 1997 Net assets available for $148,868,671 $122,424,349 plan benefits per the financial statements Amounts allocated to (2,618,508) (900,620) withdrawing participants Net Assets available $146,250,163 $121,523,729 for benefits per the Form 5500 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, 1998: 1998 Benefit payments per the statement of changes in net assets available for plan benefits $7,059,933 Add: Amounts allocated to withdrawing participants at December 31, 1998 2,618,508 Less: Amounts allocated to withdrawing participants at December 31, 1997 (900,620) Benefits paid to participants per the Form 5500 $8,777,821 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. 16 MILLIPORE CORPORATION EMPLOYEES' PARTICIPATION AND SAVINGS PLAN Notes to Financial Statements (continued) F. General Termination Condition While the Company has not expressed any intent to discontinue its contribution under the participation feature of 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 under the participation feature of 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 his account. G. Tax Status The Internal Revenue Service has determined and informed the Company by a letter dated April 28, 1995, that the Plan is qualified in accordance with applicable sections of the Internal Revenue Code (IRC). The Plan has been amended since receiving the determination letter. However, the Plan administrator believes the Plan is designed and is currently being operated in compliance with the applicable requirements of the IRC. H. Subsequent Event On June 17, 1999, the Board of Directors of Millipore Corporation approved certain amendments to the Plan, effective August 1, 1999, to change among other things, the investment custodian and to allow the Trustees of the Plan broad discretion in providing investment choices for participant directed investments. The current investment choices will be replaced in August with a new set of investment choices that have similar strategies. 17 MILLIPORE CORPORATION EMPLOYEES' PARTICIPATION AND SAVINGS PLAN Line 27a - Schedule of Assets Held for Investment Purposes as of December 31, 1998 Fair Security Description Units Cost Value MILLIPORE COMMON STOCK FUND Money Market: Provident Instit. 104,897 $104,897 $104,897 FDS/Tempfund Common Stock: Millipore Corporation** 246,143 $6,242,271 $6,968,924 TOTAL FUND INVESTMENTS $6,347,168 $7,073,821 AIM LTD MATURITY FUND Money Market: Provident Instit. 224,037 $224,037 $224,037 FDS/Tempfund Mutual Fund: AIM Ltd. Maturity 685,928 6,899,682 6,969,038 Treasury Shares TOTAL FUND INVESTMENTS $7,123,719 $7,193,075 INTEREST IN MASTER TRUST $76,763,938 $71,301,753 F&G GAC FUND Money Market: Provident Instit. FDS/Tempfund 20,742 $20,742 $20,742 Annuity Contract: Fidelity & Guaranty 2,687,616 $2,687,616 $2,687,616 Life Ins. Co. TOTAL FUND INVESTMENTS $2,708,358 $2,708,358 INVESTMENT CO. OF AMERICA FUND Money Market: Provident Instit. 69,035 $69,035 $69,035 FDS/Tempfund Mutual Fund: Investment Co. of 348,248 $7,936,570 $10,820,078 America TOTAL FUND INVESTMENTS $8,005,605 $10,889,113 LOAN FUND Participant Loans (Int - $ - $3,878,006 rate of 5.5%) ** TOTAL FUND INVESTMENTS $ - $3,878,006 INVESCO STABLE VALUE FUND Money Market: Provident Instit. 30,025 $30,025 $30,025 FDS/Tempfund Insurance Contract: Invesco Stable Asset 2,154,600 2,154,600 2,154,600 Value TOTAL FUND INVESTMENTS $2,184,625 $2,184,625 DODGE & COX BALANCED FUND Money Market: Provident Instit. 34,445 $34,445 $34,445 FDS/Tempfund Mutual Fund: Dodge & Cox Balanced 142,246 8,342,347 9,277,315 Fund TOTAL FUND INVESTMENTS $8,376,792 $9,311,760 18 MILLIPORE CORPORATION EMPLOYEES' PARTICIPATION AND SAVINGS PLAN Line 27a - Schedule of Assets Held for Investment Purposes as of December 31, 1998 (continued) Fair Security Description Units Cost Value VANGUARD S&P INDEX FUND Money Market: Provident Instit. 170,113 $170,113 $170,113 FDS/Tempfund Mutual Fund: Vanguard Index TR500 138,414 10,991,128 15,772,342 Portfolio TOTAL FUND INVESTMENTS $11,161,241 $15,942,455 AIM CONSTELLATION FUND Money Market: Provident Instit. 13,917 $13,917 $13,917 FDS/Tempfund Mutual Fund: AIM Equity FDS 299,625 6,931,778 9,144,542 Constellation TOTAL FUND INVESTMENTS $6,945,695 $9,158,459 WARBURG PINCUS INT'L FUND Money Market: Provident Instit. 27,543 $27,543 $27,543 FDS/Tempfund Mutual Fund: Warburg Pincus Equity 128,530 2,543,049 2,286,552 TOTAL FUND INVESTMENTS $2,570,592 $2,314,095 OTHER Money Market: Provident Instit. $210 $210 FDS/Tempfund Insurance Contracts: Plan American Life 1,243,777 1,243,777 Insurance Co. TOTAL FUND INVESTMENTS $1,243,987 $ 1,243,987 TOTAL INVESTMENTS $133,431,720 $143,199,507 ** Parties-in-interest. 19 MILLIPORE CORPORATION EMPLOYEES' PARTICIPATION AND SAVINGS PLAN Line 27d - Schedule of Reportable Transactions for the year ended December 31, 1998 The following table presents a series of transactions which were greater than 5 percent of the Employees' Participation and Savings Plan's total assets excluding the assets of the Balanced Fund as of January 1, 1998. Current value of Purchase Selling Cost of asset on transaction Net Description of price price asset date gain Asset Provident Institutional FDS/Tempfund Purchases $28,994,742 - $28,994,742 $28,994,742 - Sales - $27,896,086 $27,896,086 $27,896,086 - Vanguard Index Purchases $3,866,829 - $3,866,829 $3,866,829 - Sales - $ 30,000 $ 27,555 $ 30,000 $ 2,445 Millipore Stock Fund Purchases $3,916,259 - $3,916,259 $3,916,259 - Sales - $1,057,504 $ 958,294 $1,057,504 $99,210 Dodge & Cox Purchases $2,339,472 - $2,339,472 $2,339,472 - Sales - $ 695,000 $ 674,565 $ 695,000 $20,435 20 CONSENT OF INDEPENDENT ACCOUNTANTS We hereby consent to the incorporation by reference in the Registration Statement on Form S-8 (File No. 2-85698) of Millipore Corporation of our report dated May 19, 1999, except for Note H, for which the date is June 17, 1999, 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 28, 1999 21