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SEC FORM 4 SEC Form 4
FORM 4 UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940 		 
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Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
1. Name and Address of Reporting Person*
BERUBE BRIAN A
(Last) (First) (Middle)
(Street)
(City) (State) (Zip)
2. Issuer Name and Ticker or Trading Symbol
CABOT CORP [ CBT ] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
Director 10% Owner
X Officer (give title below) Other (specify below)
Vice President/General Counsel
3. Date of Earliest Transaction (Month/Day/Year)
06/18/2003
4. If Amendment, Date of Original Filed (Month/Day/Year)
 6. Individual or Joint/Group Filing (Check Applicable Line)
X Form filed by One Reporting Person
Form filed by More than One Reporting Person
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V Amount (A) or (D) Price
Common Stock 06/18/2003 S 3,000 D 29.63 23,302(1)(2) D
Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 6. Date Exercisable and Expiration Date (Month/Day/Year) 7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Explanation of Responses:
1. Mr. Berube also beneficially owns 2,791 shares of Common Stock indirectly through Cabot Corporation's RSP Trustee. Moreover, Mr. Berube beneficially owns Series B ESOP Convertible Preferred Stock, which is convertible into 4,853 shares of Common Stock, indirectly through the RSP Trustee.
2. Exhibit 24 -- Power of Attorney
Michaela Allbee **Pursuant to a power of attorney from Brian Berube 06/20/2003
** Signature of Reporting Person Date
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 4 (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.
POWER OF ATTORNEY

	Know all by these presents, that the
undersigned hereby constitutes and
appoints each of Jane A. Bell, Michaela
Allbee and Philip J. Szabla, signing
singly, the undersigned's true and
lawful attorney-in-fact to:

(1)
	execute for and on behalf of the
undersigned, in the undersigned's
capacity as an officer and/or director
of Cabot Corporation (the "Company"),
Forms 3, 4, and 5 in accordance with
Section 16(a) of the Securities Exchange
Act of 1934 and the rules thereunder;

(2)
	do and perform any and all acts for and
on behalf of the undersigned which may
be necessary or desirable to complete
and execute any such Form 3, 4, or 5,
complete and execute any amendment or
amendments thereto, and timely file such
form with the United States Securities
and Exchange Commission and any stock
exchange or similar authority; and

(3)	take any other action of any type
whatsoever in connection with the
foregoing which, in the opinion of such
attorney-in-fact, may be of benefit to,
in the best interest of, or legally
required by, the undersigned, it being
understood that the documents executed
by such attorney-in-fact on behalf of
the undersigned pursuant to this Power
of Attorney shall be in such form and
shall contain such terms and conditions
as such attorney-in-fact may approve in
such attorney-in-fact's discretion.

	The undersigned hereby grants to each
such attorney-in-fact full power and
authority to do and perform any and
every act and thing whatsoever
requisite, necessary, or proper to be
done in the exercise of any of the
rights and powers herein granted, as
fully to all intents and purposes as the
undersigned might or could do if
personally present, with full power of
substitution or revocation, hereby
ratifying and confirming all that such
attorney-in-fact, or such
attorney-in-fact's substitute or
substitutes, shall lawfully do or cause
to be done by virtue of this power of
attorney and the rights and powers
herein granted.  The undersigned
acknowledges that the foregoing
attorneys-in-fact, in serving in such
capacity at the request of the
undersigned, are not assuming, nor is
the Company assuming, any of the
undersigned's responsibilities to comply
with Section 16 of the Securities
Exchange Act of 1934.

	This Power of Attorney shall remain in
full force and effect until the
undersigned is no longer required to
file Forms 3, 4, and 5 with respect to
the undersigned's holdings of and
transactions in securities issued by the
Company, unless earlier revoked by the
undersigned in a signed writing
delivered to the foregoing
attorneys-in-fact.  The undersigned
hereby revokes any previous powers of
attorney delivered to the Company
concerning the subject matter hereof.

	IN WITNESS WHEREOF, the undersigned has
caused this Power of Attorney to be
executed as of this 16th day of June,
2003.


			/s/ Brian A. Berube

	          Signature

Brian A. Berube
			Print Name