UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549


                                  SCHEDULE 13G

                    Under the Securities Exchange Act of 1934
                                (Amendment No.)*

                                Cabot Corporation
- --------------------------------------------------------------------------------
                                (Name of Issuer)

                           Common Stock, $1 par value
- --------------------------------------------------------------------------------
                         (Title of Class of Securities)

                                    127055101
                                    ---------
                                 (CUSIP Number)

                                  May 16, 2006
                                  ------------
                      (Date of Event which Requires Filing
                               of this Statement)



Check the appropriate box to designate the rule pursuant to which this Schedule
is filed:

                  [  ]  Rule 13d-1(b)
                  [X ]  Rule 13d-1(c)
                  [  ]  Rule 13d-1(d)


*The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities, and
for any subsequent amendment containing information which would alter the
disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the Securities Exchange Act of
1934 ("Act") or otherwise subject to the liabilities of that section of the Act
but shall be subject to all other provisions of the Act (however, see the
Notes).

                                  Page 1 of 9

- ---------------------------- ------------------ CUSIP No. 127055101 13G Page 2 of 9 Pages - ---------------------------- ------------------ - ---------- --------------------------------------------------------------------- 1 NAME OF REPORTING PERSON I.R.S. IDENTIFICATION NO. OF ABOVE PERSON S.A.C. Capital Advisors, LLC - ---------- --------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) [ ] (b) [X] - ---------- --------------------------------------------------------------------- 3 SEC USE ONLY - ---------- --------------------------------------------------------------------- 4 CITIZENSHIP OR PLACE OF ORGANIZATION Delaware - -------------------------------------------------------------------------------- 5 SOLE VOTING POWER 0 NUMBER OF ----- ---------------------------------------------------- SHARES 6 SHARED VOTING POWER BENEFICIALLY OWNED 3,662,500 (see Item 4) BY ----- ---------------------------------------------------- EACH 7 SOLE DISPOSITIVE POWER REPORTING PERSON 0 WITH ----- ---------------------------------------------------- 8 SHARED DISPOSITIVE POWER 3,662,500 (see Item 4) - ---------- --------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 3,662,500 (see Item 4) - ---------- --------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES [ ] - ---------- --------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 5.8% (see Item 4) - ---------- --------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON* 00 - ---------- --------------------------------------------------------------------- *SEE INSTRUCTION BEFORE FILLING OUT Page 2 of 9

- ---------------------------- ------------------ CUSIP No. 127055101 13G Page 3 of 9 Pages - ---------------------------- ------------------ - ---------- --------------------------------------------------------------------- 1 NAME OF REPORTING PERSON I.R.S. IDENTIFICATION NO. OF ABOVE PERSON S.A.C. Capital Management, LLC - ---------- --------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) [ ] (b) [X] - ---------- --------------------------------------------------------------------- 3 SEC USE ONLY - ---------- --------------------------------------------------------------------- 4 CITIZENSHIP OR PLACE OF ORGANIZATION Delaware - -------------------------------------------------------------------------------- 5 SOLE VOTING POWER 0 NUMBER OF ----- ---------------------------------------------------- SHARES 6 SHARED VOTING POWER BENEFICIALLY OWNED 3,662,500 (see Item 4) BY ----- ---------------------------------------------------- EACH 7 SOLE DISPOSITIVE POWER REPORTING PERSON 0 WITH ----- ---------------------------------------------------- 8 SHARED DISPOSITIVE POWER 3,662,500 (see Item 4) - ---------- --------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 3,662,500 (see Item 4) - ---------- --------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES [ ] - ---------- --------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 5.8% (see Item 4) - ---------- --------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON* 00 - ---------- --------------------------------------------------------------------- *SEE INSTRUCTION BEFORE FILLING OUT Page 3 of 9

- ---------------------------- ------------------ CUSIP No. 127055101 13G Page 4 of 9 Pages - ---------------------------- ------------------ - ---------- --------------------------------------------------------------------- 1 NAME OF REPORTING PERSON I.R.S. IDENTIFICATION NO. OF ABOVE PERSON S.A.C. Capital Associates, LLC - ---------- --------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) [ ] (b) [X] - ---------- --------------------------------------------------------------------- 3 SEC USE ONLY - ---------- --------------------------------------------------------------------- 4 CITIZENSHIP OR PLACE OF ORGANIZATION Anguilla, British West Indies - -------------------------------------------------------------------------------- 5 SOLE VOTING POWER 0 NUMBER OF ----- ---------------------------------------------------- SHARES 6 SHARED VOTING POWER BENEFICIALLY OWNED 3,662,500 (see Item 4) BY ----- ---------------------------------------------------- EACH 7 SOLE DISPOSITIVE POWER REPORTING PERSON 0 WITH ----- ---------------------------------------------------- 8 SHARED DISPOSITIVE POWER 3,662,500 (see Item 4) - ---------- --------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 3,662,500 (see Item 4) - ---------- --------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES [ ] - ---------- --------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 5.8% (see Item 4) - ---------- --------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON* 00 - ---------- --------------------------------------------------------------------- *SEE INSTRUCTION BEFORE FILLING OUT Page 4 of 9

- ---------------------------- ------------------ CUSIP No. 127055101 13G Page 5 of 9 Pages - ---------------------------- ------------------ - ---------- --------------------------------------------------------------------- 1 NAME OF REPORTING PERSON I.R.S. IDENTIFICATION NO. OF ABOVE PERSON Steven A. Cohen - ---------- --------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) [ ] (b) [X] - ---------- --------------------------------------------------------------------- 3 SEC USE ONLY - ---------- --------------------------------------------------------------------- 4 CITIZENSHIP OR PLACE OF ORGANIZATION United States - -------------------------------------------------------------------------------- 5 SOLE VOTING POWER 0 NUMBER OF ----- ---------------------------------------------------- SHARES 6 SHARED VOTING POWER BENEFICIALLY OWNED 3,662,500 (see Item 4) BY ----- ---------------------------------------------------- EACH 7 SOLE DISPOSITIVE POWER REPORTING PERSON 0 WITH ----- ---------------------------------------------------- 8 SHARED DISPOSITIVE POWER 3,662,500 (see Item 4) - ---------- --------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 3,662,500 (see Item 4) - ---------- --------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES [ ] - ---------- --------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 5.8% (see Item 4) - ---------- --------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON* IN - ---------- --------------------------------------------------------------------- *SEE INSTRUCTION BEFORE FILLING OUT Page 5 of 9

Item 1(a) Name of Issuer: -------------- Cabot Corporation Item 1(b) Address of Issuer's Principal Executive Offices: ----------------------------------------------- Two Seaport Lane Boston, Massachusetts 02210 Items 2(a) Name of Person Filing: --------------------- This statement is filed by: (i) S.A.C. Capital Advisors, LLC, ("SAC Capital Advisors") with respect to shares of common stock, par value $1 per share ("Shares"), of the Issuer beneficially owned by S.A.C. Capital Associates, LLC ("SAC Capital Associates"); (ii) S.A.C. Capital Management, LLC, ("SAC Capital Management") with respect to Shares beneficially owned by SAC Capital Associates; (iii) SAC Capital Associates with respect to Shares beneficially owned by it; and (iv) Steven A. Cohen with respect to Shares beneficially owned by SAC Capital Advisors, SAC Capital Management and SAC Capital Associates. Item 2(b) Address of Principal Business Office: ------------------------------------ The address of the principal business office of (i) SAC Capital Advisors, and Mr. Cohen is 72 Cummings Point Road, Stamford, Connecticut 06902, (ii) SAC Capital Management is 540 Madison Avenue, New York, New York 10022 and (iii) SAC Capital Associates is P.O. Box 58, Victoria House, The Valley, Anguilla, British West Indies. Item 2(c) Citizenship: ----------- SAC Capital Advisors and SAC Capital Management are Delaware limited liability companies. SAC Capital Associates is an Anguillan limited liability company. Mr. Cohen is a United States citizen. Item 2(d) Title of Class of Securities: ---------------------------- Common Stock, $1 par value Item 2(e) CUSIP Number: ------------ 127055101 Item 3 Not Applicable

Page 6 of 9 Item 4 Ownership: --------- The percentages used herein are calculated based upon the Shares issued and outstanding as of May 3, 2006 as reported on the Issuer's quarterly report on Form 10-Q filed with the Securities and Exchange Commission by the Issuer for the quarterly period ended March 31, 2006. As of the close of business on May 19, 2006: 1. S.A.C. Capital Advisors, LLC (a) Amount beneficially owned: 3,662,500 (b) Percent of class: 5.8% (c)(i) Sole power to vote or direct the vote: -0- (ii) Shared power to vote or direct the vote: 3,662,500 (iii) Sole power to dispose or direct the disposition: -0- (iv) Shared power to dispose or direct the disposition: 3,662,500 2. S.A.C. Capital Management, LLC (a) Amount beneficially owned: 3,662,500 (b) Percent of class: 5.8% (c)(i) Sole power to vote or direct the vote: -0- (ii) Shared power to vote or direct the vote: 3,662,500 (iii) Sole power to dispose or direct the disposition: -0- (iv) Shared power to dispose or direct the disposition: 3,662,500 3. S.A.C. Capital Associates, LLC (a) Amount beneficially owned: 3,662,500 (b) Percent of class: 5.8% (c)(i) Sole power to vote or direct the vote: -0- (ii) Shared power to vote or direct the vote: 3,662,500 (iii) Sole power to dispose or direct the disposition: -0- (iv) Shared power to dispose or direct the disposition: 3,662,500 4. Steven A. Cohen (a) Amount beneficially owned: 3,662,500 (b) Percent of class: 5.8% (c)(i) Sole power to vote or direct the vote: -0- (ii) Shared power to vote or direct the vote: 3,662,500 (iii) Sole power to dispose or direct the disposition: -0- (iv) Shared power to dispose or direct the disposition: 3,662,500 SAC Capital Advisors, SAC Capital Management and Mr. Cohen own directly no Shares. Pursuant to investment agreements, each of SAC Capital Advisors and SAC Capital Management share all investment and voting power with respect to the securities held by SAC Capital Associates. Mr. Cohen controls each of SAC Capital Advisors and SAC Page 7 of 9

Capital Management. By reason of the provisions of Rule 13d-3 of the Securities Exchange Act of 1934, as amended, each of SAC Capital Advisors, SAC Capital Management and Mr. Cohen may be deemed to own beneficially 3,662,500 Shares (constituting approximately 5.8% of the Shares outstanding). Each of SAC Capital Advisors, SAC Capital Management and Mr. Cohen disclaim beneficial ownership of any of the securities covered by this statement. Item 5 Ownership of Five Percent or Less of a Class: -------------------------------------------- If this statement is being filed to report the fact that as of the date hereof the reporting person has ceased to be the beneficial owner of more than five percent of the class of securities, check the following. [ ] Item 6 Ownership of More than Five Percent on Behalf of Another -------------------------------------------------------- Person: ------ Not Applicable Item 7 Identification and Classification of the Subsidiary Which --------------------------------------------------------- Acquired the Security Being Reported on By the Parent ----------------------------------------------------- Holding Company: --------------- Not Applicable Item 8 Identification and Classification of Members of the Group: --------------------------------------------------------- Not Applicable Item 9 Notice of Dissolution of Group: ------------------------------ Not Applicable Item 10 Certification: ------------- By signing below the signatory certifies that, to the best of his knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect. Page 8 of 9

SIGNATURE --------- After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct. Dated: May 22, 2006 S.A.C. CAPITAL ADVISORS, LLC By: /s/ Peter Nussbaum ----------------------------------- Name: Peter Nussbaum Title: Authorized Person S.A.C. CAPITAL MANAGEMENT, LLC By: /s/ Peter Nussbaum ----------------------------------- Name: Peter Nussbaum Title: Authorized Person S.A.C. CAPITAL ASSOCIATES, LLC By: /s/ Peter Nussbaum ----------------------------------- Name: Peter Nussbaum Title: Authorized Person STEVEN A. COHEN By: /s/ Peter Nussbaum ----------------------------------- Name: Peter Nussbaum Title: Authorized Person Page 9 of 9