NEW YORK, July 17, 2015 /PRNewswire/ -- S&P SmallCap 600 constituent NetScout Systems Inc. (NASD: NTCT) will replace Tidewater Inc. (NYSE: TDW) in the S&P MidCap 400, and Tidewater will replace NetScout Systems in the S&P SmallCap 600 after the close of trading on Friday, July 24. NetScout Systems recently completed the acquisition of S&P 500 constituent Danaher Corp.'s (NYSE: DHR) communications business making NetScout Systems' post transaction market capitalization more representative of the mid-cap market space. Tidewater has a market capitalization more representative of the small-cap market space.

NetScout Systems designs, develops, manufactures, markets, licenses, sells, and supports network, application, and service assurance solutions. Headquartered in Westford, MA , the company will be added to the S&P MidCap 400 GICS (Global Industry Classification Standard) Communications Equipment Sub-Industry index.

Tidewater provides offshore service vessels and marine support services. Headquartered in New Orleans, LA, the company will be added to the S&P SmallCap 600 GICS Oil & Gas Equipment & Services Sub-Industry index.

Following is a summary of the changes:



                         S&P MIDCAP 400 INDEX - July 24, 2015
                         ------------------------------------

                  COMPANY                  GICS ECONOMIC SECTOR        GICS SUB-INDUSTRY
                  -------                  --------------------        -----------------

      ADDED  NetScout Systems             Information Technology    Communications Equipment
      -----  ----------------             ----------------------    ------------------------

     DELETED     Tidewater                        Energy         Oil & Gas Equipment & Services
     -------     ---------                        ------         ------------------------------




                   S&P SMALLCAP 600 INDEX - July 24, 2015
                   --------------------------------------

                  COMPANY                  GICS ECONOMIC SECTOR         GICS SUB-INDUSTRY
                  -------                  --------------------         -----------------

      ADDED      Tidewater                        Energy              Oil & Gas Equipment &
                                                                             Services
      -----               ---------                           ------ ----------------------

     DELETED NetScout Systems             Information Technology      Application Software
     ------- ----------------             ----------------------      --------------------

Additions to and deletions from S&P Dow Jones Indices do not in any way reflect an opinion on the investment merits of the companies involved.

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