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  <DIV style="font-family: 'Times New Roman',Times,serif">
  
  
  
  
  <DIV align="center" style="font-size: 10pt; margin-top: 18pt">As filed with the U.S. Securities and Exchange Commission on May 15, 2006
  </DIV>
  
  
  <DIV align="right" style="font-size: 10pt; margin-top: 12pt">Registration
  No.&nbsp;333- _________<BR><BR>
  </DIV>
  
  
  <DIV style="width: 100%; border-bottom: 2pt solid black; font-size: 1pt">&nbsp;</DIV>
  <DIV style="width: 100%; border-bottom: 1pt solid black; font-size: 1pt">&nbsp;</DIV>
  
  
  
  
  <DIV align="center" style="font-size: 14pt; margin-top: 12pt"><B>UNITED STATES SECURITIES AND EXCHANGE COMMISSION</B>
  </DIV>
  
  <DIV align="center" style="font-size: 12pt"><B>Washington, D.C. 20549</B>
  </DIV>
  
  <DIV align="center"><DIV style="font-size: 3pt; margin-top: 16pt; width: 30%; border-top: 1px solid #000000">&nbsp;</DIV></DIV>
  
  <DIV align="center" style="font-size: 18pt; margin-top: 12pt"><B>FORM S-8</B>
  </DIV>
  
  
  <DIV align="center" style="font-size: 12pt; margin-top: 12pt"><B>REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933</B>
  </DIV>
  
  <DIV align="center" style="font-size: 24pt; margin-top: 12pt"><B><U>CABOT
  CORPORATION</U></B>
  </DIV>
  
  
  <DIV align="center" style="font-size: 10pt; margin-top: 0pt">(Exact name of registrant as specified in its charter)</DIV>
  
  
  <DIV align="center">
  <TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
  <!-- Begin Table Head -->
  <TR valign="bottom">
      <TD width="47%">&nbsp;</TD>
      <TD width="5%">&nbsp;</TD>
      <TD width="47%">&nbsp;</TD>
  </TR>
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  <!-- Begin Table Body -->
  <TR valign="bottom">
      <TD align="center" valign="top"><B>Delaware</B><BR>
  (State or other jurisdiction<BR>
  of incorporation or organization)
  </TD>
      <TD>&nbsp;</TD>
      <TD align="center" valign="top"><B>04-2271897</B><BR>
  (I.R.S. Employer<BR>
  Identification No.)</TD>
  </TR>
  <!-- End Table Body -->
  </TABLE>
  </DIV>
  
  <DIV align="center"><DIV style="font-size: 3pt; margin-top: 16pt; width: 30%; border-top: 1px solid #000000">&nbsp;</DIV></DIV>
  
  <DIV align="center">
  <TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
  <!-- Begin Table Head -->
  <TR valign="bottom">
      <TD width="47%">&nbsp;</TD>
      <TD width="5%">&nbsp;</TD>
      <TD width="47%">&nbsp;</TD>
  </TR>
  <!-- End Table Head -->
  <!-- Begin Table Body -->
  <TR valign="bottom">
      <TD align="center" valign="top"><B>Two Seaport Lane<BR>
  Suite&nbsp;1300<BR>
  Boston, MA</B><BR>
  (Address of principal executive offices)
  </TD>
      <TD>&nbsp;</TD>
      <TD align="center" valign="top"><B>02210</B><BR>
  (Zip Code)</TD>
  </TR>
  <!-- End Table Body -->
  </TABLE>
  </DIV>
  
  
  <DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>Cabot UK Holdings Limited Inland Revenue<BR>
  Approved Employee Share Ownership Plan</B><BR>
  (Full title of the plan)
  </DIV>
  
  <DIV align="center"><DIV style="font-size: 3pt; margin-top: 16pt; width: 30%; border-top: 1px solid #000000">&nbsp;</DIV></DIV>
  
  
  <DIV align="center" style="font-size: 10pt; margin-top: 12pt">Brian A. Berube, Esq.<BR>
  Vice President and General Counsel<BR>
  Two Seaport Lane<BR>
  Suite&nbsp;1300<BR>
  Boston, MA 02210
  </DIV>
  
  
  <DIV align="center" style="font-size: 10pt"><U>(Name and address of
  agent for service)</U></DIV>
  
  
  
  <DIV align="center" style="font-size: 10pt; margin-top: 18pt">617-345-0100
  </DIV>
  
  
  <DIV align="center" style="font-size: 10pt; margin-top: 0pt"><U>(Telephone
  number, including area code, of agent for service)</U></DIV>
  
  
  
  <DIV align="center" style="font-size: 10pt; margin-top: 18pt">CALCULATION OF REGISTRATION FEE
  </DIV>
  
  <DIV align="center">
  <TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
  <!-- Begin Table Head -->
  <TR valign="bottom">
      <TD width="1%">&nbsp;</TD>
      <TD width="21%">&nbsp;</TD>
      <TD width="0%">&nbsp;</TD><!-- VRule -->
      <TD width="0%">&nbsp;</TD>
      <TD width="19%">&nbsp;</TD>
      <TD width="0%">&nbsp;</TD><!-- VRule -->
      <TD width="0%">&nbsp;</TD>
      <TD width="9%">&nbsp;</TD>
      <TD width="1%">&nbsp;</TD>
      <TD width="9%">&nbsp;</TD>
      <TD width="0%">&nbsp;</TD><!-- VRule -->
      <TD width="0%">&nbsp;</TD>
      <TD width="9%">&nbsp;</TD>
      <TD width="1%">&nbsp;</TD>
      <TD width="9%">&nbsp;</TD>
      <TD width="0%">&nbsp;</TD><!-- VRule -->
      <TD width="0%">&nbsp;</TD>
      <TD width="9%">&nbsp;</TD>
      <TD width="1%">&nbsp;</TD>
      <TD width="9%">&nbsp;</TD>
  
      <TD width="1%">&nbsp;</TD>
  </TR><TR style="font-size: 1px" valign="bottom">
      <TD nowrap align="left" colspan="21" style="border-bottom: 2px solid #000000">&nbsp;</TD>
  </TR>
  <TR style="font-size: 8pt" valign="bottom">    <TD width="1%" style="border-left: 2px solid #000000">&nbsp;</TD>
  
      <TD>&nbsp;</TD>
      <TD style="border-right: 1px solid #000000">&nbsp;</TD>
      <TD>&nbsp;</TD>
      <TD>&nbsp;</TD>
      <TD style="border-right: 1px solid #000000">&nbsp;</TD>
      <TD>&nbsp;</TD>
      <TD nowrap align="center" colspan="3">Proposed Maximum</TD>
      <TD style="border-right: 1px solid #000000">&nbsp;</TD>
      <TD>&nbsp;</TD>
      <TD nowrap align="center" colspan="3">Proposed Maximum</TD>
      <TD style="border-right: 1px solid #000000">&nbsp;</TD>
      <TD>&nbsp;</TD>
      <TD nowrap align="center" colspan="3">&nbsp;</TD>
      <TD width="1%" style="border-right: 2px solid #000000">&nbsp;</TD>
  </TR>
  <TR style="font-size: 8pt" valign="bottom">    <TD width="1%" style="border-left: 2px solid #000000">&nbsp;</TD>
  
      <TD nowrap align="center">Title Of Securities</TD>
      <TD style="border-right: 1px solid #000000">&nbsp;</TD>
      <TD>&nbsp;</TD>
      <TD nowrap align="center">Amount To Be</TD>
      <TD style="border-right: 1px solid #000000">&nbsp;</TD>
      <TD>&nbsp;</TD>
      <TD nowrap align="center" colspan="3">Offering Price Per</TD>
      <TD style="border-right: 1px solid #000000">&nbsp;</TD>
      <TD>&nbsp;</TD>
      <TD nowrap align="center" colspan="3">Aggregate Offering</TD>
      <TD style="border-right: 1px solid #000000">&nbsp;</TD>
      <TD>&nbsp;</TD>
      <TD nowrap align="center" colspan="3">Amount Of</TD>
      <TD width="1%" style="border-right: 2px solid #000000">&nbsp;</TD>
  </TR>
  <TR style="font-size: 8pt" valign="bottom">    <TD width="1%" style="border-left: 2px solid #000000">&nbsp;</TD>
  
      <TD nowrap align="center" style="border-bottom: 0px solid #000000">To Be Registered</TD>
      <TD style="border-right: 1px solid #000000">&nbsp;</TD>
      <TD>&nbsp;</TD>
      <TD nowrap align="center" style="border-bottom: 0px solid #000000">Registered (1)</TD>
      <TD style="border-right: 1px solid #000000">&nbsp;</TD>
      <TD>&nbsp;</TD>
      <TD nowrap align="center" colspan="3" style="border-bottom: 0px solid #000000">Share</TD>
      <TD style="border-right: 1px solid #000000">&nbsp;</TD>
      <TD>&nbsp;</TD>
      <TD nowrap align="center" colspan="3" style="border-bottom: 0px solid #000000">Price</TD>
      <TD style="border-right: 1px solid #000000">&nbsp;</TD>
      <TD>&nbsp;</TD>
      <TD nowrap align="center" colspan="3" style="border-bottom: 0px solid #000000">Registration Fee</TD>
      <TD width="1%" style="border-right: 2px solid #000000">&nbsp;</TD>
  </TR>
  
  <!-- End Table Head -->
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  <TR valign="bottom">
      <TD width="1%" style="border-left: 2px solid #000000; border-top: 1px solid #000000">&nbsp;</TD>
                      <TD valign="top" style="border-top: 1px solid #000000"><DIV style="margin-left:0px; text-indent:-0px">Common Stock,
  <br>Par Value $1.00 per
  share
  </DIV></TD>
      <TD style="border-right: 1px solid #000000; border-top: 1px solid #000000">&nbsp;</TD>
      <TD style="border-top: 1px solid #000000">&nbsp;</TD>
      <TD align="center" valign="bottom" style="border-top: 1px solid #000000">20,000 shares
  </TD>
      <TD style="border-right: 1px solid #000000; border-top: 1px solid #000000">&nbsp;</TD>
      <TD style="border-top: 1px solid #000000">&nbsp;</TD>
      <TD nowrap align="right" valign="bottom" style="border-top: 1px solid #000000">$</TD>
      <TD align="right" valign="bottom" style="border-top: 1px solid #000000">35.235</TD>
      <TD nowrap valign="bottom" style="border-top: 1px solid #000000">(2)</TD>
      <TD style="border-right: 1px solid #000000; border-top: 1px solid #000000">&nbsp;</TD>
      <TD style="border-top: 1px solid #000000">&nbsp;</TD>
      <TD nowrap align="right" valign="bottom" style="border-top: 1px solid #000000">$</TD>
      <TD align="right" valign="bottom" style="border-top: 1px solid #000000">704,700</TD>
      <TD nowrap valign="bottom" style="border-top: 1px solid #000000">(2)</TD>
      <TD style="border-right: 1px solid #000000; border-top: 1px solid #000000">&nbsp;</TD>
      <TD style="border-top: 1px solid #000000">&nbsp;</TD>
      <TD nowrap align="right" valign="bottom" style="border-top: 1px solid #000000">$</TD>
      <TD align="right" valign="bottom" style="border-top: 1px solid #000000">75.41</TD>
      <TD nowrap valign="top" style="border-top: 1px solid #000000">&nbsp;</TD>
      <TD width="1%" style="border-right: 2px solid #000000; border-top: 1px solid #000000">&nbsp;</TD>
  </TR>
  <TR style="font-size: 1px" valign="bottom">
      <TD nowrap align="left" colspan="21" style="border-top: 2px solid #000000">&nbsp;</TD>
  </TR>
  
  <!-- End Table Body -->
  </TABLE>
  </DIV>
  
  <DIV style="margin-top: 6pt">
  <TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">
  
  <TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
      <TD width="1%" nowrap align="left">(1)</TD>
      <TD width="1%">&nbsp;</TD>
      <TD>Pursuant to Rule 416(a) under the Securities Act of 1933, this registration statement also
  covers such additional shares of Common Stock as may become issuable under the plan to
  prevent dilution from stock splits, stock dividends and similar transactions.</TD>
  </TR>
  
  </TABLE>
  </DIV>
  
  <DIV style="margin-top: 6pt">
  <TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">
  
  <TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
      <TD width="1%" nowrap align="left">(2)</TD>
      <TD width="1%">&nbsp;</TD>
      <TD>Estimated solely for the purpose of calculating the registration fee pursuant to Rules 457(c)
  and 457(h) of the Securities Act of 1933, as amended, and based upon the average of the high
  and low prices of the Common Stock as reported on the New York Stock Exchange Composite Tape
  on May&nbsp;10, 2006.</TD>
  </TR>
  
  </TABLE>
  </DIV>
  
  <DIV style="width: 100%; border-bottom: 1pt solid black; margin-top: 10pt; font-size: 1pt">&nbsp;</DIV>
  <DIV style="width: 100%; border-bottom: 2pt solid black; font-size: 1pt">&nbsp;</DIV>
  
  
  
  
  
  <P align="center" style="font-size: 10pt">&nbsp;
  </DIV>
  
  <!-- PAGEBREAK -->
  <P><HR noshade><P>
  <H5 align="left" style="page-break-before:always">&nbsp;</H5><P>
  
  <DIV style="font-family: 'Times New Roman',Times,serif">
  
  
  
  
  
  
  
  
  
  <DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>EXPLANATORY NOTE</B>
  </DIV>
  
  
  <DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Cabot Corporation (the &#147;Registrant&#148;) filed a Registration Statement on Form S-8 on July&nbsp;22,
  2002 (Registration No.&nbsp;333-96881) (the &#147;AESOP Registration Statement&#148;) to register shares of Common
  Stock for issuance pursuant to the Cabot UK Holdings Limited Inland Revenue Approved Employee Share
  Ownership Plan (the &#147;AESOP&#148;). For purposes of registering additional shares of Common Stock for
  issuance pursuant to the AESOP, we hereby incorporate by reference into this registration statement
  the contents of the AESOP Registration Statement.
  </DIV>
  
  <DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>PART II<BR>
  INFORMATION REQUIRED IN THE REGISTRATION STATEMENT</B>
  </DIV>
  
  
  <DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>Item&nbsp;8. Exhibits.</B>
  </DIV>
  
  <DIV align="center">
  <TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="93%">
  <!-- Begin Table Head -->
  <TR valign="bottom">
      <TD width="10%">&nbsp;</TD>
      <TD width="2%">&nbsp;</TD>
      <TD width="90%">&nbsp;</TD>
  </TR>
  <!-- End Table Head -->
  <!-- Begin Table Body -->
  <TR valign="bottom">
      <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Exhibit<br>
  <u>Number</u>
  </DIV></TD>
      <TD>&nbsp;</TD>
      <TD align="left" valign="top"><br><u>Document Description</u></TD>
  </TR>
  <TR valign="bottom"><!-- Blank Space -->
      <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
      <TD>&nbsp;</TD>
      <TD align="left" valign="top">&nbsp;</TD>
  </TR>
  <TR valign="bottom">
      <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">4.1
  </DIV></TD>
      <TD>&nbsp;</TD>
      <TD align="left" valign="top">Restated Certificate of Incorporation of Cabot Corporation (incorporated by
  reference to Exhibit&nbsp;3.1 to the Quarterly Report on Form&nbsp;10-Q of Cabot Corporation,
  File No.&nbsp;1-5667, filed with the Commission on February&nbsp;9, 2006).</TD>
  </TR>
  <TR valign="bottom">
      <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">23.1*
  </DIV></TD>
      <TD>&nbsp;</TD>
      <TD align="left" valign="top">Consent of PricewaterhouseCoopers LLP.</TD>
  </TR>
  <TR valign="bottom">
      <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">24*
  </DIV></TD>
      <TD>&nbsp;</TD>
      <TD align="left" valign="top">Power of Attorney (included on the signature page of this registration statement).</TD>
  </TR>
  <!-- End Table Body -->
  </TABLE>
  </DIV>
  
  
  
  <DIV align="left">
  <DIV style="font-size: 3pt; margin-top: 16pt; width: 18%; border-top: 1px solid #000000">&nbsp;</DIV>
  </DIV>
  
  <TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">
  <TR>
      <TD width="3%"></TD>
      <TD width="1%"></TD>
      <TD width="96"></TD>
  </TR>
  
  <TR valign="top">
      <TD nowrap align="left" colspan="3">*Filed herewith</TD>
  </TR>
  
  </TABLE>
  
  
  <P align="center" style="font-size: 10pt">&nbsp;
  </DIV>
  
  <!-- PAGEBREAK -->
  <P><HR noshade><P>
  <H5 align="left" style="page-break-before:always">&nbsp;</H5><P>
  
  <DIV style="font-family: 'Times New Roman',Times,serif">
  
  
  
  
  
  
  <DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>SIGNATURES</B>
  </DIV>
  
  
  <DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Pursuant to the requirements of the Securities Act of 1933, the Registrant certifies that it
  has reasonable grounds to believe that it meets all of the requirements for filing on Form S-8 and
  has duly caused this registration statement to be signed on its behalf by the undersigned,
  thereunto duly authorized, in the City of Boston, The Commonwealth of Massachusetts, on this 12th
  day of May, 2006.
  </DIV>
  
  <TABLE width="100%" border="0" cellspacing="0" cellpadding="0" style="font-size: 10pt">
  <TR>
      <TD width="48%">&nbsp;</TD>
      <TD width="1%">&nbsp;</TD>
      <TD width="1%">&nbsp;</TD>
      <TD width="35%">&nbsp;</TD>
      <TD width="15%">&nbsp;</TD>
  </TR>
  <TR>
      <TD valign="top" align="left">&nbsp;</TD>
      <TD colspan="3" align="left">CABOT CORPORATION<BR>
  &nbsp;</TD>
      <TD>&nbsp;</TD>
  </TR><TR>
      <TD align="left">&nbsp;</TD>
      <TD valign="top">By:&nbsp;&nbsp;</TD>
      <TD colspan="2" style="border-bottom: 1px solid #000000" align="left">/s/ <FONT style="font-variant: SMALL-CAPS">Kennett F. Burnes</FONT>
  &nbsp;</TD>
      <TD>&nbsp;</TD>
  </TR><TR>
      <TD align="left">&nbsp;</TD>
      <TD>&nbsp;</TD>
      <TD valign="top">Name:&nbsp;&nbsp;</TD>
      <TD align="left">Kennett F. Burnes&nbsp;</TD>
      <TD>&nbsp;</TD>
  </TR><TR>
      <TD align="left">&nbsp;</TD>
      <TD>&nbsp;</TD>
      <TD valign="top">Title:&nbsp;&nbsp;</TD>
      <TD align="left">President and Chief Executive Officer&nbsp;</TD>
      <TD>&nbsp;</TD>
  </TR>
  <TR>
      <TD colspan="5">&nbsp;</TD>
  </TR>
  </TABLE>
  <!-- link1 "SIGNATURES AND POWER OF ATTORNEY" -->
  
  <DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>SIGNATURES AND POWER OF ATTORNEY</B>
  </DIV>
  
  
  
  <DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Each person whose signature appears below constitutes and appoints Brian A. Berube and Jane A.
  Bell and each of them singly, his or her true and lawful attorney-in-fact and agent with full power
  of substitution and resubstitution, for him or her and in his or her name, place and stead as a
  director or officer or both, as the case may be, of Cabot Corporation, to sign any and all
  amendments (including post-effective amendments) to this Registration Statement on Form S-8 to be
  filed by Cabot Corporation, and all documents or instruments necessary or appropriate to enable
  Cabot Corporation to comply with the Securities Act of 1933, as amended, and to file the same, with
  all exhibits thereto, with the Securities and Exchange Commission, granting unto said
  attorneys-in-fact and agents full power and authority to do and perform each and every act
  whatsoever that is necessary, appropriate or advisable in connection with any or all of the
  above-described matters and to all intents and purposes as he or she might or could do in person,
  hereby ratifying and confirming all that said attorneys-in-fact and agents, or their substitutes,
  may lawfully do or cause to be done by virtue hereof.
  </DIV>
  
  <DIV align="center" style="font-size: 10pt; margin-top: 18pt">* * * *
  </DIV>
  
  
  <DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Pursuant to the requirements of the Securities Act of 1933, as amended, this registration
  statement has been signed by the following persons in the capacities and on the dates indicated.
  </DIV>
  <DIV align="center">
  <TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
  <!-- Begin Table Head -->
  <TR valign="bottom">
      <TD width="30%">&nbsp;</TD>
      <TD width="5%">&nbsp;</TD>
      <TD width="30%">&nbsp;</TD>
      <TD width="5%">&nbsp;</TD>
      <TD width="20%">&nbsp;</TD>
  </TR>
  <TR style="font-size: 10pt" valign="bottom">
      <TD nowrap align="left"><U>Signature</U></TD>
      <TD>&nbsp;</TD>
      <TD nowrap align="left"><U>Title</U></TD>
      <TD>&nbsp;</TD>
      <TD nowrap align="left"><U>Date</U></TD>
  </TR>
  
  <!-- End Table Head -->
  <!-- Begin Table Body -->
  <TR valign="bottom"><!-- Blank Space -->
      <TD align="right">&nbsp;</TD>
      <TD>&nbsp;</TD>
      <TD align="center" nowrap valign="top">&nbsp;</TD>
      <TD>&nbsp;</TD>
      <TD align="center" valign="top">&nbsp;</TD>
  </TR>
  <TR valign="bottom" style="padding-top: 1em">
      <TD align="left" nowrap valign="top">/s/ Kennett F. Burnes
  <DIV style="font-size: 1pt; border-bottom: 1px solid #000000">&nbsp;</DIV>
  <FONT style="font-variant: SMALL-CAPS">Kennett F. Burnes</FONT></TD>
      <TD>&nbsp;</TD>
      <TD align="left">
  Director, Chairman of the Board, Chief<BR>
  Executive Officer and President
  <br>(Principal Executive Officer)
  </TD>
      <TD>&nbsp;</TD>
      <TD align="left" valign="top">May 12, 2006</TD>
  </TR>
  <TR valign="bottom" style="padding-top: 1em">
      <TD align="left" nowrap valign="top">/s/ Jonathan P. Mason
  <DIV style="font-size: 1pt; border-bottom: 1px solid #000000">&nbsp;</DIV>
  J<FONT style="font-variant: SMALL-CAPS">onathan </FONT>P. M<FONT style="font-variant: SMALL-CAPS">ason</FONT></TD>
      <TD>&nbsp;</TD>
      <TD align="left">
  Executive Vice President and<BR>Chief
  Financial Officer
  <br>(Principal Financial Officer)
  </TD>
      <TD>&nbsp;</TD>
      <TD align="left" valign="top">May 12, 2006</TD>
  </TR>
  <TR valign="bottom" style="padding-top: 1em">
      <TD align="left" nowrap valign="top">/s/ James P. Kelly
  <DIV style="font-size: 1pt; border-bottom: 1px solid #000000">&nbsp;</DIV>
  J<FONT style="font-variant: SMALL-CAPS">ames </FONT>P. K<FONT style="font-variant: SMALL-CAPS">elly</FONT></TD>
      <TD>&nbsp;</TD>
      <TD align="left">
  Controller
  <br>(Controller/Principal Accounting Officer)
  </TD>
      <TD>&nbsp;</TD>
      <TD align="left" valign="top">May 12, 2006</TD>
  </TR>
  
  <TR valign="bottom" style="padding-top: 1em">
      <TD align="left" valign="top">/s/ John S. Clarkeson
  <DIV style="font-size: 1pt; border-bottom: 1px solid #000000">&nbsp;</DIV>
  J<FONT style="font-variant: SMALL-CAPS">ohn </FONT>S. C<FONT style="font-variant: SMALL-CAPS">larkeson</FONT></TD>
      <TD>&nbsp;</TD>
      <TD align="left" valign="top">Director</TD>
      <TD>&nbsp;</TD>
      <TD align="left" valign="top">May 12, 2006</TD>
  </TR>
  <!-- End Table Body -->
  </TABLE>
  </DIV>
  
  
  <P align="center" style="font-size: 10pt">&nbsp;
  </DIV>
  
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  <P><HR noshade><P>
  <H5 align="left" style="page-break-before:always">&nbsp;</H5><P>
  
  <DIV style="font-family: 'Times New Roman',Times,serif">
  
  <DIV align="center">
  <TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
  <!-- Begin Table Head -->
  <TR valign="bottom">
      <TD width="30%">&nbsp;</TD>
      <TD width="5%">&nbsp;</TD>
      <TD width="30%">&nbsp;</TD>
      <TD width="5%">&nbsp;</TD>
      <TD width="20%">&nbsp;</TD>
  </TR>
  <TR style="font-size: 10pt" valign="bottom">
      <TD nowrap align="left"><U>Signature</U></TD>
      <TD>&nbsp;</TD>
      <TD nowrap align="left"><U>Title</U></TD>
      <TD>&nbsp;</TD>
      <TD nowrap align="left"><U>Date</U></TD>
  </TR>
  
  <!-- End Table Head -->
  <!-- Begin Table Body -->
  <TR valign="bottom" style="padding-top: 1em">
      <TD align="left" nowrap valign="top">/s/ Juan Enriquez-Cabot
  <DIV style="font-size: 1pt; border-bottom: 1px solid #000000">&nbsp;</DIV>
  J<FONT style="font-variant: SMALL-CAPS">uan </FONT>E<FONT style="font-variant: SMALL-CAPS">nriquez-</FONT>C<FONT style="font-variant: SMALL-CAPS">abot</FONT></TD>
      <TD>&nbsp;</TD>
      <TD align="left" valign="top">
  Director
  </TD>
      <TD>&nbsp;</TD>
      <TD align="left" valign="top">May 12, 2006</TD>
  </TR>
  <TR valign="bottom" style="padding-top: 1em">
      <TD align="left" nowrap valign="top">/s/ Arthur L. Goldstein
  <DIV style="font-size: 1pt; border-bottom: 1px solid #000000">&nbsp;</DIV>
  <FONT style="font-variant: SMALL-CAPS">Arthur L. Goldstein</FONT></TD>
      <TD>&nbsp;</TD>
      <TD align="left" valign="top">
  Director
  </TD>
      <TD>&nbsp;</TD>
      <TD align="left" valign="top">May 12, 2006</TD>
  </TR>
  <TR valign="bottom" style="padding-top: 1em">
      <TD align="left" nowrap valign="top">/s/ Gautam S. Kaji
  <DIV style="font-size: 1pt; border-bottom: 1px solid #000000">&nbsp;</DIV>
  <FONT style="font-variant: SMALL-CAPS">Gautam S. Kaji</FONT></TD>
      <TD>&nbsp;</TD>
      <TD align="left" valign="top">
  Director
  </TD>
      <TD>&nbsp;</TD>
      <TD align="left" valign="top">May 12, 2006</TD>
  </TR>
  <TR valign="bottom" style="padding-top: 1em">
      <TD align="left" nowrap valign="top">/s/ Roderick C.G. MacLeod
  <DIV style="font-size: 1pt; border-bottom: 1px solid #000000">&nbsp;</DIV>
  <FONT style="font-variant: SMALL-CAPS">Roderick C.G. Macleod</FONT></TD>
      <TD>&nbsp;</TD>
      <TD align="left" valign="top">
  Director
  </TD>
      <TD>&nbsp;</TD>
      <TD align="left" valign="top">May 12, 2006</TD>
  </TR>
  <TR valign="bottom" style="padding-top: 1em">
      <TD align="left" nowrap valign="top">/s/ John H. McArthur
  <DIV style="font-size: 1pt; border-bottom: 1px solid #000000">&nbsp;</DIV>
  <FONT style="font-variant: SMALL-CAPS">John H. McArthur</FONT></TD>
      <TD>&nbsp;</TD>
      <TD align="left" valign="top">
  Director
  </TD>
      <TD>&nbsp;</TD>
      <TD align="left" valign="top">May 12, 2006</TD>
  </TR>
  <TR valign="bottom" style="padding-top: 1em">
      <TD align="left" nowrap valign="top">/s/ Henry F. McCance
  <DIV style="font-size: 1pt; border-bottom: 1px solid #000000">&nbsp;</DIV>
  <FONT style="font-variant: SMALL-CAPS">Henry </FONT>F. M<FONT style="font-variant: SMALL-CAPS">cCance</FONT></TD>
      <TD>&nbsp;</TD>
      <TD align="left" valign="top">
  Director
  </TD>
      <TD>&nbsp;</TD>
      <TD align="left" valign="top">May 12, 2006</TD>
  </TR>
  <TR valign="bottom" style="padding-top: 1em">
      <TD align="left" nowrap valign="top">/s/ John F. O&#146;Brien
  <DIV style="font-size: 1pt; border-bottom: 1px solid #000000">&nbsp;</DIV>
  <FONT style="font-variant: SMALL-CAPS">John F. O&#146;Brien</FONT></TD>
      <TD>&nbsp;</TD>
      <TD align="left" valign="top">
  Director
  </TD>
      <TD>&nbsp;</TD>
      <TD align="left" valign="top">May 12, 2006</TD>
  </TR>
  <TR valign="bottom" style="padding-top: 1em">
      <TD align="left" nowrap valign="top">/s/ Ronaldo H. Schmitz
  <DIV style="font-size: 1pt; border-bottom: 1px solid #000000">&nbsp;</DIV>
  <FONT style="font-variant: SMALL-CAPS">Ronaldo H. Schmitz</FONT></TD>
      <TD>&nbsp;</TD>
      <TD align="left" valign="top">
  Director
  </TD>
      <TD>&nbsp;</TD>
      <TD align="left" valign="top">May 12, 2006</TD>
  </TR>
  <TR valign="bottom" style="padding-top: 1em">
      <TD align="left" nowrap valign="top">/s/ Lydia W. Thomas
  <DIV style="font-size: 1pt; border-bottom: 1px solid #000000">&nbsp;</DIV>
  <FONT style="font-variant: SMALL-CAPS">Lydia W. Thomas</FONT></TD>
      <TD>&nbsp;</TD>
      <TD align="left" valign="top">
  Director
  </TD>
      <TD>&nbsp;</TD>
      <TD align="left" valign="top">May 12, 2006</TD>
  </TR>
  <TR valign="bottom" style="padding-top: 1em">
      <TD align="left" nowrap valign="top">/s/ Mark S. Wrighton
  <DIV style="font-size: 1pt; border-bottom: 1px solid #000000">&nbsp;</DIV>
  <FONT style="font-variant: SMALL-CAPS">Mark S. Wrighton</FONT></TD>
      <TD>&nbsp;</TD>
      <TD align="left" valign="top">
  Director
  </TD>
      <TD>&nbsp;</TD>
      <TD align="left" valign="top">May 12, 2006</TD>
  </TR>
  <TR valign="bottom" style="padding-top: 1em">
      <TD align="left" nowrap valign="top">/s/ Dirk L. Blevi
  <DIV style="font-size: 1pt; border-bottom: 1px solid #000000">&nbsp;</DIV>
  <FONT style="font-variant: SMALL-CAPS">Dirk L. blevi</FONT></TD>
      <TD>&nbsp;</TD>
      <TD align="left" valign="top">
  Director
  </TD>
      <TD>&nbsp;</TD>
      <TD align="left" valign="top">May 12, 2006</TD>
  </TR>
  <!-- End Table Body -->
  </TABLE>
  </DIV>
  
  
  <P align="center" style="font-size: 10pt">&nbsp;
  </DIV>
  
  <!-- PAGEBREAK -->
  <P><HR noshade><P>
  <H5 align="left" style="page-break-before:always">&nbsp;</H5><P>
  
  <DIV style="font-family: 'Times New Roman',Times,serif">
  
  <!-- link1 "EXHIBIT INDEX" -->
  
  <DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>EXHIBIT INDEX</B>
  </DIV>
  
  <DIV align="center">
  <TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="95%">
  <!-- Begin Table Head -->
  <TR valign="bottom">
      <TD width="10%">&nbsp;</TD>
      <TD width="2%">&nbsp;</TD>
      <TD width="90%">&nbsp;</TD>
  </TR>
  <!-- End Table Head -->
  <!-- Begin Table Body -->
  <TR valign="bottom">
      <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Exhibit<br>
  <u>Number</u>
  </DIV></TD>
      <TD>&nbsp;</TD>
      <TD align="left" valign="top"><br><u>Document Description</u></TD>
  </TR>
  <TR valign="bottom"><!-- Blank Space -->
      <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
      <TD>&nbsp;</TD>
      <TD align="center" valign="top">&nbsp;</TD>
  </TR>
  <TR valign="bottom">
      <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">4.2
  </DIV></TD>
      <TD>&nbsp;</TD>
      <TD align="left" valign="top">Restated Certificate of Incorporation of Cabot Corporation (incorporated by
  reference to Exhibit&nbsp;3.1 to the Quarterly Report on Form&nbsp;10-Q of Cabot Corporation,
  File No.&nbsp;1-5667, filed with the Commission on February&nbsp;9, 2006).</TD>
  </TR>
  <TR valign="bottom">
      <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">23.1*
  </DIV></TD>
      <TD>&nbsp;</TD>
      <TD align="left" valign="top">Consent of PricewaterhouseCoopers LLP.</TD>
  </TR>
  <TR valign="bottom">
      <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">24*
  </DIV></TD>
      <TD>&nbsp;</TD>
      <TD align="left" valign="top">Power of Attorney (included on the signature page of this registration statement).</TD>
  </TR>
  <!-- End Table Body -->
  </TABLE>
  </DIV>
  
  
  
  <DIV align="left">
  <DIV style="font-size: 3pt; margin-top: 16pt; width: 18%; border-top: 1px solid #000000">&nbsp;</DIV>
  </DIV>
  
  <TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">
  <TR>
      <TD width="3%"></TD>
      <TD width="1%"></TD>
      <TD width="96"></TD>
  </TR>
  
  <TR valign="top">
      <TD nowrap align="left" colspan="3">*Filed herewith</TD>
  </TR>
  
  </TABLE>
  
  
  
  
  <P align="center" style="font-size: 10pt">&nbsp;
  </DIV>
  
  </BODY>
  </HTML>
metadata_documents: [{"type": "S-8", "sequence": "1", "filename": "b60952a2sv8.htm", "description": "CABOT CORPORATION", "secsgml_size_bytes": 28560}]
metadata_filer: {"company-data": {"conformed-name": "CABOT CORP", "cik": "0000016040", "assigned-sic": "2890", "irs-number": "042271897", "state-of-incorporation": "DE", "fiscal-year-end": "0930"}, "filing-values": {"form-type": "S-8", "act": "33", "file-number": "333-134134", "film-number": "06842041"}, "business-address": {"street1": "TWO SEAPORT LANE SUITE 1300", "city": "BOSTON", "state": "MA", "zip": "02109-1806", "phone": "6173450100"}, "mail-address": {"street1": "TWO SEAPORT LANE SUITE 1300", "city": "BOSTON", "state": "MA", "zip": "82109"}, "former-company": {"former-conformed-name": "CABOT GODFREY L INC", "date-changed": "19680418"}}
text: sv8
  As filed with the U.S. Securities and Exchange Commission on May 15, 2006
  Registration
  No. 333- _________
  UNITED STATES SECURITIES AND EXCHANGE COMMISSION
  Washington, D.C. 20549
  FORM S-8
  REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933
  CABOT
  CORPORATION
  (Exact name of registrant as specified in its charter)
  Delaware
  (State or other jurisdiction
  of incorporation or organization)
  04-2271897
  (I.R.S. Employer
  Identification No.)
  Two Seaport Lane
  Suite 1300
  Boston, MA
  (Address of principal executive offices)
  02210
  (Zip Code)
  Cabot UK Holdings Limited Inland Revenue
  Approved Employee Share Ownership Plan
  (Full title of the plan)
  Brian A. Berube, Esq.
  Vice President and General Counsel
  Two Seaport Lane
  Suite 1300
  Boston, MA 02210
  (Name and address of
  agent for service)
  617-345-0100
  (Telephone
  number, including area code, of agent for service)
  CALCULATION OF REGISTRATION FEE
  Proposed Maximum
  Proposed Maximum
  Title Of Securities
  Amount To Be
  Offering Price Per
  Aggregate Offering
  Amount Of
  To Be Registered
  Registered (1)
  Share
  Price
  Registration Fee
  Common Stock,
  Par Value $1.00 per
  share
  20,000 shares
  $
  35.235
  (2)
  $
  704,700
  (2)
  $
  75.41
  (1)
  Pursuant to Rule 416(a) under the Securities Act of 1933, this registration statement also
  covers such additional shares of Common Stock as may become issuable under the plan to
  prevent dilution from stock splits, stock dividends and similar transactions.
  (2)
  Estimated solely for the purpose of calculating the registration fee pursuant to Rules 457(c)
  and 457(h) of the Securities Act of 1933, as amended, and based upon the average of the high
  and low prices of the Common Stock as reported on the New York Stock Exchange Composite Tape
  on May 10, 2006.
  EXPLANATORY NOTE
  Cabot Corporation (the "Registrant") filed a Registration Statement on Form S-8 on July 22,
  2002 (Registration No. 333-96881) (the "AESOP Registration Statement") to register shares of Common
  Stock for issuance pursuant to the Cabot UK Holdings Limited Inland Revenue Approved Employee Share
  Ownership Plan (the "AESOP"). For purposes of registering additional shares of Common Stock for
  issuance pursuant to the AESOP, we hereby incorporate by reference into this registration statement
  the contents of the AESOP Registration Statement.
  PART II
  INFORMATION REQUIRED IN THE REGISTRATION STATEMENT
  Item 8. Exhibits.
  Exhibit
  Number
  Document Description
  4.1
  Restated Certificate of Incorporation of Cabot Corporation (incorporated by
  reference to Exhibit 3.1 to the Quarterly Report on Form 10-Q of Cabot Corporation,
  File No. 1-5667, filed with the Commission on February 9, 2006).
  23.1*
  Consent of PricewaterhouseCoopers LLP.
  24*
  Power of Attorney (included on the signature page of this registration statement).
  *Filed herewith
  SIGNATURES
  Pursuant to the requirements of the Securities Act of 1933, the Registrant certifies that it
  has reasonable grounds to believe that it meets all of the requirements for filing on Form S-8 and
  has duly caused this registration statement to be signed on its behalf by the undersigned,
  thereunto duly authorized, in the City of Boston, The Commonwealth of Massachusetts, on this 12th
  day of May, 2006.
  CABOT CORPORATION
  By:
  /s/
  Kennett F. Burnes
  Name:
  Kennett F. Burnes
  Title:
  President and Chief Executive Officer
  SIGNATURES AND POWER OF ATTORNEY
  Each person whose signature appears below constitutes and appoints Brian A. Berube and Jane A.
  Bell and each of them singly, his or her true and lawful attorney-in-fact and agent with full power
  of substitution and resubstitution, for him or her and in his or her name, place and stead as a
  director or officer or both, as the case may be, of Cabot Corporation, to sign any and all
  amendments (including post-effective amendments) to this Registration Statement on Form S-8 to be
  filed by Cabot Corporation, and all documents or instruments necessary or appropriate to enable
  Cabot Corporation to comply with the Securities Act of 1933, as amended, and to file the same, with
  all exhibits thereto, with the Securities and Exchange Commission, granting unto said
  attorneys-in-fact and agents full power and authority to do and perform each and every act
  whatsoever that is necessary, appropriate or advisable in connection with any or all of the
  above-described matters and to all intents and purposes as he or she might or could do in person,
  hereby ratifying and confirming all that said attorneys-in-fact and agents, or their substitutes,
  may lawfully do or cause to be done by virtue hereof.
  * * * *
  Pursuant to the requirements of the Securities Act of 1933, as amended, this registration
  statement has been signed by the following persons in the capacities and on the dates indicated.
  Signature
  Title
  Date
  /s/ Kennett F. Burnes
  Kennett F. Burnes
  Director, Chairman of the Board, Chief
  Executive Officer and President
  (Principal Executive Officer)
  May 12, 2006
  /s/ Jonathan P. Mason
  J
  onathan
  P. M
  ason
  Executive Vice President and
  Chief
  Financial Officer
  (Principal Financial Officer)
  May 12, 2006
  /s/ James P. Kelly
  J
  ames
  P. K
  elly
  Controller
  (Controller/Principal Accounting Officer)
  May 12, 2006
  /s/ John S. Clarkeson
  J
  ohn
  S. C
  larkeson
  Director
  May 12, 2006
  Signature
  Title
  Date
  /s/ Juan Enriquez-Cabot
  J
  uan
  E
  nriquez-
  C
  abot
  Director
  May 12, 2006
  /s/ Arthur L. Goldstein
  Arthur L. Goldstein
  Director
  May 12, 2006
  /s/ Gautam S. Kaji
  Gautam S. Kaji
  Director
  May 12, 2006
  /s/ Roderick C.G. MacLeod
  Roderick C.G. Macleod
  Director
  May 12, 2006
  /s/ John H. McArthur
  John H. McArthur
  Director
  May 12, 2006
  /s/ Henry F. McCance
  Henry
  F. M
  cCance
  Director
  May 12, 2006
  /s/ John F. O'Brien
  John F. O'Brien
  Director
  May 12, 2006
  /s/ Ronaldo H. Schmitz
  Ronaldo H. Schmitz
  Director
  May 12, 2006
  /s/ Lydia W. Thomas
  Lydia W. Thomas
  Director
  May 12, 2006
  /s/ Mark S. Wrighton
  Mark S. Wrighton
  Director
  May 12, 2006
  /s/ Dirk L. Blevi
  Dirk L. blevi
  Director
  May 12, 2006
  EXHIBIT INDEX
  Exhibit
  Number
  Document Description
  4.2
  Restated Certificate of Incorporation of Cabot Corporation (incorporated by
  reference to Exhibit 3.1 to the Quarterly Report on Form 10-Q of Cabot Corporation,
  File No. 1-5667, filed with the Commission on February 9, 2006).
  23.1*
  Consent of PricewaterhouseCoopers LLP.
  24*
  Power of Attorney (included on the signature page of this registration statement).
  *Filed herewith