[Form 4] CABOT CORP Insider Trading Activity

Rhea-AI Filing Summary

Cabot Corporation (CBT) senior vice president and general counsel Karen A. Kalita reported equity awards and related share activity on a Form 4 dated for transactions on 11/19/2025.

She acquired 4,518 shares of common stock at a stated price of $0, increasing her direct holdings. She also acquired 4,084 common shares at a stated price of $0, described as performance-based units earned for fiscal 2025, with 2,931 of those still subject to time-based vesting. To cover obligations associated with these awards, 872 shares were disposed of at $59.76 per share.

Following these transactions, she directly held 45,242 common shares and indirectly held 577.005 shares through the trustee for the corporation’s 401(k) plan. In addition, she was granted an employee stock option for 16,908 shares of common stock with an exercise price of $59.76 per share, expiring on 11/18/2035, vesting 30% on 11/19/2026, 30% on 11/19/2027, and 40% on 11/19/2028.

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

OMB APPROVAL

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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).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Kalita Karen A

(Last) (First) (Middle)

C/O CABOT CORPORATION

TWO SEAPORT LANE, SUITE 1400

(Street)

BOSTON MA 02210

(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)
	SVP and General Counsel

3. Date of Earliest Transaction (Month/Day/Year)
11/19/2025

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	11/19/2025		A		4,518	A	$0	42,030	D
Common Stock	11/19/2025		A		4,084(1)	A	$0	46,114	D
Common Stock	11/19/2025		F		872	D	$59.76	45,242	D
Common Stock								577.005	I	Through the Trustee for the Corporation's 401(k) Plan

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
Employee Stock Option (Right to Buy)	$59.76	11/19/2025		A		16,908		(2)	11/18/2035	Common Stock	16,908	$0	16,908	D

Explanation of Responses:

1. Consists of performance based units earned on the basis of the Corporation's performance in fiscal year 2025, of which 2,931 remain subject to time-based vesting.

2. The option vests over a three year period as follows: 30% on November 19, 2026, 30% on November 19, 2027 and 40% on November 19, 2028.

	By: Jennifer Lombardi, pursuant to a power of attorney from Karen A. Kalita	11/21/2025
	** 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.

FAQ

What insider activity did Cabot Corp (CBT) report on this Form 4?

The Form 4 reports that Karen A. Kalita, Cabot Corporation’s senior vice president and general counsel, received common stock awards, performance-based units, and an employee stock option, along with a share disposition related to these awards on 11/19/2025.

How many Cabot Corp (CBT) shares did Karen Kalita acquire and dispose of?

On 11/19/2025 she acquired 4,518 shares of common stock at a stated price of $0 and 4,084 common shares at a stated price of $0, and 872 shares were disposed of at $59.76 per share.

What performance-based units were reported for Cabot Corp (CBT)?

The filing notes that 4,084 common shares represent performance-based units earned based on Cabot’s fiscal 2025 performance, of which 2,931 remain subject to time-based vesting conditions.

What stock option grant did Karen Kalita receive from Cabot Corp (CBT)?

She received an employee stock option covering 16,908 shares of Cabot common stock with an exercise price of $59.76 per share, expiring on 11/18/2035, vesting 30% on 11/19/2026, 30% on 11/19/2027, and 40% on 11/19/2028.

How many Cabot Corp (CBT) shares does Karen Kalita own after the reported transactions?

After the reported transactions, she held 45,242 common shares directly and 577.005 shares indirectly through the trustee for Cabot Corporation’s 401(k) plan.

What is Karen Kalita’s role at Cabot Corp (CBT)?

She is reported as an officer of Cabot Corporation, serving as senior vice president and general counsel, and the Form 4 is filed for one reporting person.