NEW YORK, Dec. 15 /PRNewswire/ -- S&P MidCap 400 constituent Roper Industries Inc. (NYSE: ROP) will replace ENSCO International Inc. (NYSE: ESV) in the S&P 500, and tw telecom Inc. (Nasdaq: TWTC) will replace Roper Industries in the S&P MidCap 400 after the close of trading on Tuesday, December 22. ENSCO International is changing its legal domicile and relocating its corporate headquarters from the U.S. to the U.K., making it ineligible for continued inclusion in the S&P 500.

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

Roper makes high-tech industrial equipment and analytical instruments. Headquartered in Sarasota, FL, the company will be added to the S&P 500 GICS (Global Industry Classification Standard) Electrical Components & Equipment Sub-Industry index.

tw telecom is a provider of managed network services. Headquartered in Littleton, CO, the company will be added to the S&P Midcap 400 GICS Alternative Carriers Sub-Industry index.

Following is a summary of the changes:

             S&P  500 INDEX  -  December 22, 2009
             ------------------------------------
                               GICS ECONOMIC      GICS SUB-
                 COMPANY           SECTOR         INDUSTRY
                 -------       -------------     ---------
                                                 Electrical
                  Roper                         Components &
     ADDED      Industries      Industrials       Equipment
     -----      ----------      -----------    ------------
                  ENSCO                           Oil & Gas
    DELETED   International       Energy          Drilling
    -------   -------------       ------         ---------

           S&P  MIDCAP 400 INDEX  -  December 22,
                             2009
           --------------------------------------
                             GICS ECONOMIC       GICS SUB-
                COMPANY          SECTOR          INDUSTRY
                -------      -------------      ---------
                   tw      Telecommunication   Alternative
     ADDED      telecom         Services         Carriers
     -----      -------    -----------------   -----------
                                                Electrical
                 Roper                         Components &
    DELETED   Industries      Industrials        Equipment
    -------   ----------      -----------     ------------

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SOURCE Standard & Poor's

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