Cabot VP receives 4.4 phantom stock units

Cabot Corp’s VP, Controller & CAO received a small dividend-related phantom stock credit under the Supplemental 401(k) Plan.

Rhea-AI Filing Summary

CABOT CORP (symbol: CBT) is the issuer of record for a Form 4 filing submitted to the SEC. Dumont Lisa M reported acquisition or exercise transactions in this Form 4 filing.

For CABOT CORP (CBT), vice president, controller and chief accounting officer Lisa M. Dumont received an automatic credit of 4.4039 Phantom Stock Units on September 11, 2026. These units are credited as dividends under the company’s Supplemental 401(k) Plan on a 1-for-1 basis with common stock and will be settled in shares upon her retirement or other termination of employment. Following this award, she holds a total of 747.0562 Phantom Stock Units directly. No Rule 10b5-1 trading plan is reported for this transaction.

Insider Trade Summary

Grant/Award: 4.4039 shares

Grant/Award 1 txn

Insider Dumont Lisa M

Role VP, Controller & CAO

Type	Security	Shares	Price	Value
Grant/Award	Phantom Stock Units F1, F2	4.4039	$79.68	$350.90

Holdings After Transaction: Phantom Stock Units — 747.0562 contracts (Direct)

Footnotes (2)

1. F1. 1 for 1
2. F2. 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.

Key Figures

Phantom Stock Units acquired: 4.4039 units Per-unit reference price: $79.68 per unit Total Phantom Stock Units after award: 747.0562 units +1 more

4 metrics

Phantom Stock Units acquired 4.4039 units Grant credited on September 11, 2026 as dividend-related phantom stock

Per-unit reference price $79.68 per unit Reference price reported for the 4.4039 Phantom Stock Units

Total Phantom Stock Units after award 747.0562 units Direct phantom stock holdings after the September 11, 2026 transaction

Underlying common shares for this award 4.4039 shares Each Phantom Stock Unit corresponds 1-for-1 to Cabot common stock

Key Terms

Phantom Stock Units, Supplemental 401(k) Plan, termination of employment

3 terms

Phantom Stock Units financial

"credit of 4.4039 Phantom Stock Units on September 11, 2026"

Phantom stock units are company promises that pay a cash or stock-equivalent award tied to the firm’s share price or value growth, but they do not issue actual shares. Think of them as a bonus check that moves with the stock like a mirror rather than handing over an ownership slice. Investors care because these awards can affect a company’s future cash obligations, executive incentives and reported expenses without causing share dilution.

Supplemental 401(k) Plan financial

"phantom stock units acquired under the Corporation's Supplemental 401(k) Plan"

termination of employment regulatory

"to be settled upon the reporting person's retirement or other termination of employment"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transaction did CBT report for Lisa M. Dumont?

Lisa M. Dumont received an automatic credit of 4.4039 Phantom Stock Units on September 11, 2026, as a dividend-related grant under Cabot Corp’s Supplemental 401(k) Plan, increasing her direct phantom stock balance to 747.0562 units.

What are the key terms of the phantom stock units reported by CBT?

Each Phantom Stock Unit is credited on a 1-for-1 basis with Cabot Corp common stock and represents 4.4039 underlying common shares for this award. The units are to be settled in shares when the executive retires or otherwise terminates employment.

How many phantom stock units does the CBT officer hold after this Form 4 transaction?

After the September 11, 2026 transaction, the officer holds 747.0562 Phantom Stock Units directly under Cabot Corp’s Supplemental 401(k) Plan, including the newly credited 4.4039 units from dividends.

Was the Cabot Corp (CBT) phantom stock transaction under a Rule 10b5-1 plan?

No. The filing indicates that no Rule 10b5-1 trading plan is associated with this transaction. It is an automatic credit of phantom stock units related to dividends under the Supplemental 401(k) Plan.

When will the reported CBT phantom stock units be settled?

The filing states that the Phantom Stock Units will be settled upon the reporting person’s retirement or other termination of employment, consistent with the terms of Cabot Corp’s Supplemental 401(k) Plan.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 09/14/2026 - 05:03 PM Accepted by SEC EDGAR 09/14/2026 - 05:00 PM Learn about SEC filing dates

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^*

Dumont Lisa M

(Last) (First) (Middle)

C/O CABOT CORPORATION

TWO SEAPORT LANE, SUITE 1400

(Street)

BOSTON MASSACHUSETTS 02210

(City) (State) (Zip)

UNITED STATES

(Country)

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)
	VP, Controller & CAO

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
09/11/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

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)	09/11/2026		A		4.4039		(2)	(2)	Common Stock	4.4039	$79.68	747.0562	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 Lisa M. Dumont	09/14/2026
	** 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.
* Form 4: SEC 1474 (03-26)