[Form 4] CABOT CORP Insider Trading Activity

Rhea-AI Filing Summary

Sean D. Keohane, President and CEO of Cabot Corporation (CBT), reported an acquisition of 241.6837 phantom stock units on 09/11/2025. The filing shows the phantom units have an attributed value of $81.47 per underlying share and correspond to 241.6837 shares of common stock. After the transaction, Mr. Keohane beneficially owns 43,997.1756 shares. The filing explains these units represent dividends paid on phantom stock units under the Corporation's Supplemental 401(k) Plan and will be settled upon the reporting person's retirement or termination of employment. The Form 4 was signed by Jennifer Lombardi under power of attorney on 09/15/2025.

Positive

• CEO ownership increased by 241.6837 phantom units, raising alignment with shareholders to 43,997.1756 beneficially owned shares
• Units are part of a Supplemental 401(k) Plan, indicating standardized plan-driven compensation rather than ad hoc awards

Negative

• None.

Insights

Corporate Governance Expert

TL;DR: Routine executive acquisition of deferred-compensation units that modestly increases CEO alignment with shareholders.

The reported acquisition is a settlement-structured issuance of phantom stock units tied to the Supplemental 401(k) Plan rather than an open-market purchase. Such awards typically reflect compensation plan mechanics (dividend equivalents) and are payable at retirement or termination, so immediate voting or cash impact is limited. The increase to 43,997.1756 beneficially owned shares shows ongoing executive exposure to the company's equity performance but is not a material change in ownership percentage based solely on this filing.

Executive Compensation Analyst

TL;DR: This is a compensation-plan driven grant of dividend-equivalent phantom units, not a discretionary stock buy, with limited immediate liquidity effect.

Details indicate 241.6837 phantom units credited as dividend equivalents, valued at $81.47 per share, to be settled upon separation from service. This reflects routine plan administration rather than a negotiated retention award or new performance grant. The mechanics and settlement timing (retirement/termination) are explicit, limiting near-term dilution or cash-flow consequences for the company.

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
Estimated average burden
hours per response:			0.5

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^*

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)
09/11/2025

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)	09/11/2025		A		241.6837		(2)	(2)	Common Stock	241.6837	$81.47	43,997.1756	D

Explanation of Responses:

1. 1 for 1

2. Represents dividends paid on phantom stock units acquired under the Corporation's Supplemental 401(k) Plan and are to be settled upon the reporting person's retirement or other termination of employment.

	By: Jennifer Lombardi, pursuant to a power of attorney from Sean D. Keohane	09/15/2025
	** 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 Sean D. Keohane report on Form 4 for CBT?

He reported acquisition of 241.6837 phantom stock units on 09/11/2025, tied to Cabot's Supplemental 401(k) Plan.

How many shares does Sean D. Keohane beneficially own after the transaction?

43,997.1756 shares of common stock are reported as beneficially owned following the transaction.

What is the value per share attributed to the phantom units in the filing?

The filing lists a per-share price of $81.47 for the underlying common stock associated with the units.

When will the phantom stock units be settled?

The filing states the units are to be settled upon the reporting person's retirement or other termination of employment.

Who signed the Form 4 and when was it filed?

The Form 4 was signed by Jennifer Lombardi under power of attorney for Sean D. Keohane on 09/15/2025.