[Form 4] CABOT CORP Insider Trading Activity

Rhea-AI Filing Summary

Doug G. Del Grosso, a director of Cabot Corporation (CBT), reported an acquisition of phantom stock units on 09/11/2025 under the company's Non-Employee Director's Deferral Plan. The report shows 27.8548 phantom stock units were acquired at a recorded per-unit value of $81.47, resulting in a total of 5,070.8166 common-stock-equivalent units beneficially owned by the reporting person after the transaction.

The filing explains these units represent dividends paid on phantom stock units and will be settled upon the reporting person's termination of service or per his distribution election. The Form 4 was executed via power of attorney and signed on 09/15/2025.

Positive

• Increased reported ownership: Beneficial ownership rises to 5,070.8166 common-stock-equivalent units following the transaction.
• Clear disclosure of settlement terms: The filing states units "will be settled upon termination of service or per the distribution election," providing investor clarity.
• Routine director compensation: The transaction is compensation-related under the Non-Employee Director's Deferral Plan, not an open-market trade.

Negative

• None.

Insights

Corporate Governance Expert

TL;DR: Routine director compensation deferral increases reported beneficial ownership; no unusual trading or insider disposition.

This Form 4 documents a non-cash acquisition tied to the Non-Employee Director's Deferral Plan rather than an open-market purchase. Such grants or dividend-equivalent accruals are common for non-employee directors and primarily affect disclosure of ownership levels and potential future dilution metrics. The filing contains clear settlement conditions and was submitted under power of attorney, indicating standard administrative handling.

Compensation Analyst

TL;DR: Director received 27.8548 phantom units valued at $81.47 each; these are deferred compensation, not immediate cash or stock issuance.

The reported 27.8548 units reflect dividend equivalents credited to a phantom stock account and carry a per-unit value of $81.47. Because settlement is deferred until service termination or per an election, the transaction does not immediately change outstanding shares. This is a routine compensation administration item with limited near-term market impact.

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^*

DELGROSSO DOUGLAS G

(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
	Officer (give title below)		Other (specify below)

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		27.8548		(2)	(2)	Common Stock	27.8548	$81.47	5,070.8166	D

Explanation of Responses:

1. 1 for 1

2. Represents dividends paid on phantom stock units acquired under the Corporation's Non-Employee Director's Deferral Plan and will be settled either upon the reporting person's termination of service as a director or in accordance with the distribution election of the reporting person, whichever first occurs.

	By: Jennifer Lombardi, pursuant to a power of attorney from Doug G. Del Grosso	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 Doug G. Del Grosso report on the Form 4 for CBT?

He reported acquisition of 27.8548 phantom stock units under Cabot's Non-Employee Director's Deferral Plan on 09/11/2025.

How many total units does Doug Del Grosso beneficially own after the transaction?

The filing shows 5,070.8166 common-stock-equivalent units beneficially owned following the reported transaction.

What value was assigned to the phantom units in the Form 4?

The reported per-unit value is $81.47 for the phantom stock units acquired.

When will the phantom stock units be settled?

The units "will be settled upon the reporting person's termination of service as a director or in accordance with the distribution election," whichever occurs first.

Who signed or executed the Form 4 filing?

The Form 4 was executed by Jennifer Lombardi pursuant to a power of attorney from Doug G. Del Grosso and dated 09/15/2025.