Cabot CEO credited 283.6 phantom stock units

Q: What is the relationship between the Phantom Stock Units and CABOT CORP (CBT) common stock?

Each Phantom Stock Unit corresponds to one share of CABOT CORP common stock, as indicated by a one-for-one conversion. The units are to be settled in common stock upon the CEO’s retirement or other termination of employment, rather than immediately.

Q: Why were the additional Phantom Stock Units credited to the CABOT CORP (CBT) CEO?

The 283.6362 additional Phantom Stock Units represent dividends paid on previously acquired phantom stock units under CABOT CORP’s Supplemental 401(k) Plan. They are credited instead of cash dividends and will be settled at retirement or other termination of employment.

Q: Was a Rule 10b5-1 trading plan involved in this CABOT CORP (CBT) Form 4 transaction?

No. The filing indicates that no Rule 10b5-1 trading plan is reported in connection with this credit of Phantom Stock Units to CABOT CORP’s President and CEO, Sean D. Keohane.

Cabot Corp’s CEO received a small dividend-based phantom stock unit credit that will be settled in common stock at retirement.

Filing Impact

(Neutral)

Filing Sentiment

(Neutral)

Form Type

Rhea-AI Filing Summary

CABOT CORP (CBT) reported that President and CEO Sean D. Keohane received an automatic credit of 283.6362 Phantom Stock Units on September 11, 2026. These units are credited as dividends on previously awarded phantom stock units, convert into common stock on a 1-for-1 basis, and are scheduled to be settled upon his retirement or other termination of employment. Following this credit, he holds 48,114.6135 Phantom Stock Units directly. No Rule 10b5-1 trading plan is reported.

Insider Trade Summary

Grant/Award: 283.6362 shares

Grant/Award 1 txn

Insider Keohane Sean D

Role President and CEO

Type	Security	Shares	Price	Value
Grant/Award	Phantom Stock Units ^{F1, F2}	283.6362	$79.68	$23K

Holdings After Transaction: Phantom Stock Units — 48,114.6135 contracts (Direct)

Footnotes (2)

F1. 1 for 1
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 credited: 283.6362 units Equivalent common shares for new units: 283.6362 shares Total Phantom Stock Units after transaction: 48,114.6135 units +2 more

5 metrics

Phantom Stock Units credited 283.6362 units Automatic credit on September 11, 2026 as dividends on prior phantom units

Equivalent common shares for new units 283.6362 shares Each Phantom Stock Unit converts into one share of common stock

Total Phantom Stock Units after transaction 48,114.6135 units Direct holdings of President and CEO Sean D. Keohane after September 11, 2026 credit

Reference value per Phantom Stock Unit $79.68 per unit Value associated with the September 11, 2026 credit of Phantom Stock Units

Settlement timing At retirement or termination Phantom Stock Units are to be settled upon retirement or other termination of employment

Key Terms

Phantom Stock Units, Supplemental 401(k) Plan

2 terms

Phantom Stock Units financial

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

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

"acquired under the Corporation's Supplemental 401(k) Plan and are to be settled"

FAQ

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

What insider transaction did CABOT CORP (CBT) report for its CEO?

CABOT CORP reported that President and CEO Sean D. Keohane received an automatic credit of 283.6362 Phantom Stock Units on September 11, 2026, as dividends on previously acquired phantom stock units under the company’s Supplemental 401(k) Plan.

How many Phantom Stock Units does the CABOT CORP (CBT) CEO hold after this Form 4?

After the September 11, 2026 credit, President and CEO Sean D. Keohane holds 48,114.6135 Phantom Stock Units directly. These units are linked to CABOT CORP common stock on a one-for-one basis and are scheduled to be settled at retirement or other termination of employment.

What is the relationship between the Phantom Stock Units and CABOT CORP (CBT) common stock?

Each Phantom Stock Unit corresponds to one share of CABOT CORP common stock, as indicated by a one-for-one conversion. The units are to be settled in common stock upon the CEO’s retirement or other termination of employment, rather than immediately.

Why were the additional Phantom Stock Units credited to the CABOT CORP (CBT) CEO?

The 283.6362 additional Phantom Stock Units represent dividends paid on previously acquired phantom stock units under CABOT CORP’s Supplemental 401(k) Plan. They are credited instead of cash dividends and will be settled at retirement or other termination of employment.

Was a Rule 10b5-1 trading plan involved in this CABOT CORP (CBT) Form 4 transaction?

No. The filing indicates that no Rule 10b5-1 trading plan is reported in connection with this credit of Phantom Stock Units to CABOT CORP’s President and CEO, Sean D. Keohane.

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

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Available on EDGAR 09/14/2026 - 05:04 PM Accepted by SEC EDGAR 09/14/2026 - 05:00 PM

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

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)

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

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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)

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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
Phantom Stock Units	⁽¹⁾	09/11/2026		A		283.6362		⁽²⁾	⁽²⁾	Common Stock	283.6362	$79.68	48,114.6135	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	09/14/2026
	** 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)

Source: View Original Filing on SEC EDGAR

Cabot CEO credited 283.6 phantom stock units

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