FORM 3 UNITED 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
or Section 30(h) of the Investment Company Act of 1940
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1. Name and Address of Reporting Person *
Delahunt Steven J
(Last) (First) (Middle)
C/O CABOT CORPORATION
TWO SEAPORT LANE, SUITE 1400
(Street)
BOSTON MA 02210
(City) (State) (Zip)
2. Date of Event Requiring Statement (Month/Day/Year)
10/01/2026 		3. Issuer Name and Ticker or Trading Symbol
CABOT CORP [ CBT ]
4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
Director 10% Owner
X Officer (give title below) Other (specify below)
Interim CFO
 5. 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 Beneficially Owned
1. Title of Security (Instr. 4) 2. Amount of Securities Beneficially Owned (Instr. 4) 3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5) 4. Nature of Indirect Beneficial Ownership (Instr. 5)
Common Stock 5,399 (1)
D
 
Common Stock 2.4733
I
Through the Trustee for the Corporation's 401(k) Plan
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 Exercise Price of Derivative Security 5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5) 6. Nature of Indirect Beneficial Ownership (Instr. 5)
Date Exercisable Expiration Date Title Amount or Number of Shares
Phantom Stock   (2)   (2) Common Stock 3,771.773 0 D  
Explanation of Responses:
1. Consists of 1,113 performance based units earned on the basis of the Corporation's performance in fiscal years 2024 and 2025 (which remain subject to time-based vesting) and 4,286 units subject to time-based vesting.
2. Each share of phantom stock is the economic equivalent of one share of Cabot Corporation common stock. The shares of phantom stock will be settled in shares of Cabot Corporation common stock upon termination of his employment with Cabot Corporation and in accordance with his distribution elections.
Remarks:
Exhibit-24 Power of Attorney attached.
By: Jennifer Lombardi, pursuant to a power of attorney from Steven J. Delahunt 10/07/2026
** 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.
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ATTACHMENTS / EXHIBITS

ATTACHMENTS / EXHIBITS

EX-24.DELAHUNTPOA