FORM 3UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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1. Name and Address of Reporting Person*
SPO ADVISORY CORP
(Last)(First)(Middle)
591 REDWOOD HIGHWAY, SUITE 3215
(Street)
MILL VALLEYCA94941
(City)(State)(Zip)
2. Date of Event Requiring Statement (Month/Day/Year)
08/11/2008		3. Issuer Name and Ticker or Trading Symbol
CABOT CORP [CBT]
4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
DirectorX10% Owner
Officer (give title below)Other (specify below)
5. If Amendment, Date of Original Filed (Month/Day/Year)
6. Individual or Joint/Group Filing (Check Applicable Line)
Form filed by One Reporting Person
XForm filed by More than One Reporting Person
Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4) 2. Amount of Securities Owned (Instr. 4) 3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5) 4. Nature of Indirect Beneficial Ownership (Instr. 5)
Common Stock 10,078,200
I (1) (2) (3) (4)
See footnotes
Table II - Derivative Securities Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4) 2. Date Exercisable and Expiration Date (Month/Day/Year) 3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)4. Conversion or Excercise Price of Derivative Security 5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5) 6. Nature of Indirect Beneficial Ownership (Instr. 5)
Date ExercisableExpiration DateTitleAmount or Number of Shares
Explanation of Responses:
1. This form is being filed to add Edward H. McDermott ("EHM") as a Reporting Person as a result of his becoming, for purposes of Section 13D of the Securities Exchange Act of 1934, an additional controlling person of SPO Advisory Corp. ("SPO Corp.") on August 11, 2008 and as such EHM may be deemed to form a "group" together with (i) SPO Partners II, L.P. ("SPO Partners") and San Francisco Partners II, L.P. ("SF Partners"), (ii) SPO Advisory Partners, L.P. ("SPO Advisory"), the sole general partner of SPO Partners, (iii) SF Advisory Partners, L.P. ("SF Advisory"), the sole general partner of SF Partners, (iv) SPO Corp., the sole general partner of SPO Advisory and SF Advisory, (v) John H. Scully ("JHS"), William E. Oberndorf ("WEO"), William J. Patterson ("WJP") and EHM, the four controlling persons of SPO Corp.
2. Additional group members are (i) Oberndorf Family Partners, a California limited partnership, (ii) The Elizabeth R. and William J. Patterson Foundation ,(iii) Ian McGuire, (iv) Peter C. Oberndorf, (v) William Ernst Oberndorf and (vi) Betty Jane Weimer.
3. There was no change in EHM's pecuniary interest in the equity securities of the Issuer resulting from his becoming a controlling person of SPO Corp.
4. 9,662,600 shares of the issuer's common stock are owned directly by SPO Partners and may be deemed to be indirectly beneficially owned by (i) SPO Advisory (ii) SPO Corp. and (iii) JHS, WEO, WJP, and EHM. Additionally 415,600 shares are owned directly by SF Partners, and may be deemed to be indirectly beneficially owned by (i) SF Advisory, (ii) SPO Corp. and (iii) JHS, WEO, WJP, and EHM.
 
Remarks:
The�individuals�and�entities�listed�in�the�notes�above�(each�a�"Reporting�Person")�may�be�deemed�to�form�a�"group",�as�such�term�is�defined�in�Rule�13d-5(b)(1)�promulgated�under�the�Securities�Exchange�Act�of�1934,�for�purposes�of�this�filing.��This�filing�shall�not�be�deemed�as�an�admission�by�any�Reporting�Person�that�such�person�is,�for�purposes�of�Section�16�of�the�Securities�Exchange�Act�of�1934�or�otherwise,�the�beneficial�owner�of�any�equity�securities�covered�by�this�statement.��Each�Reporting�Person�disclaims�beneficial�ownership�of�the�reported�securities�except�to�the�extent�of�such�person's�pecuniary�interest,�if�any,�therein.
Kim SIlva08/12/2008
** Signature of Reporting PersonDate
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 5(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.



 
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