Exhibit (21) SUBSIDIARIES OF MILLIPORE CORPORATION Pursuant to Item 601, Paragraph 22, clause (ii) of Regulation S-K, the following list excludes subsidiaries who conduct no business operations or which have no significant assets. COMPANY JURISDICTION Millipore Asia Ltd. Delaware Millipore Cidra, Inc. Delaware Millipore Intertech, (V.I.), Inc. U.S. Virgin Is. Millipore International Holding Company B.V. Netherlands Millipore Japan Company L.L.C. Delaware Millipore S.A./N.V. Belgium Millipore (Canada) Ltd. Canada Millipore (U.K.) Ltd. United Kingdom Millipore S.A. France Millipore Ireland B.V. Netherlands Millipore GmbH West Germany Millipore S.p.A. Italy Millipore A.B. Sweden Millipore A.G. Switzerland Millipore A/S Denmark Millipore Australia Pty. Ltd. Australia Millipore GesmbH Austria Millipore Iberica S.A. Spain Millipore S.A. de C.V. Mexico Millipore I.E.C., Ltda. Brazil Millipore OY Finland Millipore B.V. The Netherlands Millipore Korea Ltd. Korea Millipore China Ltd. Hong Kong Millipore of New Hampshire, Inc. New Hampshire Millicorp, Inc. Delaware Minerva Insurance Corp. Ltd. Bermuda Nihon Millipore Limited Japan Biosyntech Biochemische Synthesetechnik Gmbh Germany Millipore Investment Holdings Ltd. Delaware Sterimatics Corporation Massachusetts Immunosystems Incorporated Maine Waters Investments Limited Delaware Waters Puerto Rico, Inc. Delaware Extrel Corporation Pennsylvania Extrel FTMS, Inc. Delaware Biosearch, Inc. Massachusetts Milliscope, Inc. Delaware Millipore AS Norway MSUB Ltd United Kingdom Shallford Entity SDN BHD Malaysia