Cabot Corporation (NYSE: CBT) details SVP phantom stock unit award

Rhea-AI Filing Summary

Cabot Corporation reported that one of its senior vice presidents acquired additional phantom stock units linked to the company’s common stock. On 12/12/2025, the officer received 1.9091 phantom stock units as shown in the derivative securities table, bringing the total number of phantom stock units beneficially owned to 291.8366, held directly.

According to the footnotes, these phantom stock units are credited on a 1-for-1 basis with Cabot common shares and represent dividends paid on phantom stock units previously acquired under the Corporation’s Supplemental 401(k) Plan. The units are to be settled in connection with the reporting person’s retirement or other termination of employment, meaning the economic value is deferred until the end of the officer’s service.

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^*

Masterson William F III

(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)
	Senior Vice President

3. Date of Earliest Transaction (Month/Day/Year)
12/12/2025

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)	12/12/2025		A		1.9091		(2)	(2)	Common Stock	1.9091	$68.34	291.8366	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 William F. Masterson, III	12/16/2025
	** 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 equity transaction did Cabot Corp (CBT) report on 12/12/2025?

Cabot Corporation disclosed that a senior vice president acquired 1.9091 phantom stock units tied to Cabot common stock on 12/12/2025, increasing the officer’s directly held phantom stock units to 291.8366.

What are the phantom stock units reported by Cabot Corp (CBT)?

The phantom stock units are credited on a 1-for-1 basis with Cabot common stock and represent dividends paid on phantom stock units acquired under the Corporation’s Supplemental 401(k) Plan.

How many phantom stock units does the Cabot Corp senior vice president hold after this transaction?

Following the 12/12/2025 transaction, the senior vice president beneficially owns 291.8366 phantom stock units, held in direct form according to the derivative securities table.

When will the Cabot Corp phantom stock units be settled for the reporting person?

The filing states that the phantom stock units are to be settled upon the reporting person’s retirement or other termination of employment, deferring settlement until the end of service.

Under which plan were the Cabot Corp phantom stock units credited?

The phantom stock units, including the 1.9091 units reported on 12/12/2025, relate to dividends on units acquired under Cabot Corporation’s Supplemental 401(k) Plan.

What role does the reporting person hold at Cabot Corp (CBT)?

The reporting person is listed as an officer of Cabot Corporation with the title Senior Vice President, and the filing is made for one reporting person.