NEW YORK, July 8 /PRNewswire/ -- ACE Limited (NYSE: ACE) will replace Millipore Corp. (NYSE: MIL) in the S&P 500 index after the close of trading on Wednesday, July 14. Millipore is being acquired by S&P Global 1200 constituent Merck KGaA in a deal expected to close on or about that date.

Standard & Poor's will monitor this transaction, and post any relevant updates on its website: www.standardandpoors.com.

ACE provides a range of insurance and reinsurance products to commercial and individual customers. Headquartered in Zurich, Switzerland, the company will be added to the S&P 500 GICS (Global Industry Classification Standard) Property & Casualty Insurance Sub-Industry index.

Following is a summary of the change:

               S&P 500 INDEX  - July 14, 2010
                           GICS ECONOMIC       GICS SUB-
               COMPANY         SECTOR          INDUSTRY
                                              Property &
                                               Casualty
     ADDED       ACE        Financials         Insurance
     -----       ---        ----------         ----------
                                            Life Sciences
                                                Tools &
    DELETED   Millipore     Health Care        Services
    -------   ---------     -----------     --------------

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SOURCE Standard & Poor's