[Form 4] CABOT CORP Insider Trading Activity

Rhea-AI Filing Summary

Sean D. Keohane, President and CEO of Cabot Corporation (CBT), acquired 333.7885 phantom stock units on 09/30/2025 under the company's supplemental 401(k) plan. The filing reports these units are to be settled in Common Stock upon the reporting person's retirement or other termination of service. The reported acquisition used transaction code A and shows a reported per‑unit price of $76.05. Following the transaction, the filing lists total beneficial ownership of 44,330.9641 shares (direct). The Form 4 was signed by an authorized representative on behalf of Mr. Keohane on 10/02/2025.

Positive

• CEO acquisition of 333.7885 phantom stock units aligns executive compensation with shareholder value
• Units to be settled in common stock upon retirement, creating long‑term alignment without immediate dilution
• Transaction documented under company supplemental 401(k) plan, indicating an established benefit program

Negative

• None.

Insights

Corporate Governance Expert

CEO received 333.7885 phantom stock units, aligning long‑term pay with shareholder value.

What it means: The CEO, Sean D. Keohane, acquired 333.7885 phantom stock units under the supplemental 401(k) plan that will convert to Common Stock upon retirement or termination. This ties a portion of executive compensation to the company's equity over time.

Why it matters: Phantom units that settle in shares create future dilution only upon settlement and signal management participation in equity outcomes. The filing reports a per‑unit price of $76.05 and shows total direct beneficial ownership of 44,330.9641 shares, providing a clear, documented change in insider holdings.

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

OMB Number:			3235-0287
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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^*

Keohane Sean D

(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)

X	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	President and CEO

3. Date of Earliest Transaction (Month/Day/Year)
09/30/2025

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

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
Phantom Stock Units	(1)	09/30/2025		A		333.7885		(2)	(2)	Common Stock	333.7885	$76.05	44,330.9641	D

Explanation of Responses:

1. 1 for 1

2. The reported phantom stock units were acquired under the Corporation's supplemental 401(k) plan and are to be settled upon the reporting person's retirement or other termination of service.

	By: Mazda Cintron, pursuant to a power of attorney from Sean D. Keohane	10/02/2025
	** 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 did Cabot Corporation insider Sean D. Keohane acquire on 09/30/2025 (CBT)?

He acquired 333.7885 phantom stock units on 09/30/2025, reported on Form 4.

How will the phantom stock units for Sean D. Keohane be settled?

The units are to be settled in Common Stock upon the reporting person's retirement or other termination of service.

What price is listed for the reported phantom stock units in the Form 4?

The filing shows a reported price of $76.05 per unit.

What is Sean D. Keohane's role at Cabot Corporation as listed on the Form 4?

He is listed as President and CEO and a Director of Cabot Corporation.

How many shares does the Form 4 report Sean D. Keohane beneficially owns after the transaction?

The filing reports 44,330.9641 shares beneficially owned following the reported transaction.