<DOCUMENT>
<TYPE>EX-21
<SEQUENCE>3
<FILENAME>b52710ccexv21.txt
<DESCRIPTION>EX-21 LIST OF SIGNIFICANT SUBSIDIARIES
<TEXT>
<PAGE>
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                                                                      EXHIBIT 21


                                CABOT CORPORATION

                SIGNIFICANT SUBSIDIARIES AS OF SEPTEMBER 30, 2004


<TABLE>
<CAPTION>
   NAME                                         JURISDICTION
   ----                                         ------------
<S>                                             <C>
Cabot International Capital Corporation         Delaware

Cabot B.V.                                      The Netherlands

Cabot Carbon Limited                            England

Cabot G.B. Limited                              England

Cabot Supermetals K.K.                          Japan
</TABLE>


</TEXT>
</DOCUMENT>