Cabot director awarded additional phantom stock units

CABOT CORP director Douglas G. DelGrosso reported a compensation-related award of phantom stock units.

Rhea-AI Filing Summary

CABOT CORP director Douglas G. DelGrosso reported a compensation-related award of phantom stock units. On June 12, 2026, he acquired 27.6938 Phantom Stock Units, each tied 1-for-1 to CABOT common stock, reflecting dividends on prior deferred units.

Following this grant, DelGrosso holds a total of 5,164.9539 Phantom Stock Units directly. These units, acquired under CABOT’s Non-Employee Director’s Deferral Plan, will be settled in Cabot common stock or cash after his board service ends or as he has elected for distribution.

Insider Trade Summary

Grant/Award: 27.6938 shares

Grant/Award 1 txn

Insider DELGROSSO DOUGLAS G

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Phantom Stock Units	27.6938	$87.65	$2K

Holdings After Transaction: Phantom Stock Units — 5,164.9539 contracts (Direct)

Footnotes (2)

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

Key Figures

Phantom units granted: 27.6938 units Reported price per unit: $87.65 per unit Total phantom units after grant: 5,164.9539 units +2 more

5 metrics

Phantom units granted 27.6938 units Grant of phantom stock units on June 12, 2026

Reported price per unit $87.65 per unit Transaction price reference for phantom stock units

Total phantom units after grant 5,164.9539 units Director’s phantom stock balance following transaction

Conversion ratio 1-for-1 Each phantom stock unit tied to one CABOT common share

Exercise price $0.00 Conversion or exercise price for phantom stock units

Key Terms

Phantom Stock Units, Non-Employee Director's Deferral Plan, distribution election

3 terms

Phantom Stock Units financial

"Represents dividends paid on phantom stock units acquired under the Corporation's Non-Employee Director's Deferral 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.

Non-Employee Director's Deferral Plan financial

"acquired under the Corporation's Non-Employee Director's Deferral Plan and will be settled either upon the reporting person's termination"

distribution election financial

"or in accordance with the distribution election of the reporting person, whichever first occurs"

FAQ

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

What insider transaction did CABOT CORP (CBT) disclose for Douglas G. DelGrosso?

CABOT CORP disclosed that director Douglas G. DelGrosso received 27.6938 phantom stock units as a compensation-related award. These units represent dividends on previously deferred phantom stock and increase his total phantom stock holdings to 5,164.9539 units under the company’s director deferral plan.

What are phantom stock units in CABOT CORP’s (CBT) director filing?

Phantom stock units are bookkeeping entries that track CABOT CORP’s common stock value on a 1-for-1 basis. For Douglas G. DelGrosso, they represent deferred director compensation and dividend equivalents, settled after his board service ends or according to his distribution election.

How many phantom stock units does Douglas G. DelGrosso now hold at CABOT CORP (CBT)?

After the reported transaction, Douglas G. DelGrosso holds 5,164.9539 phantom stock units at CABOT CORP. This total reflects the newly credited 27.6938 units, which were added as dividend equivalents to his existing deferred director compensation balance under the company’s deferral plan.

Was the CABOT CORP (CBT) insider transaction a market purchase or sale?

The CABOT CORP transaction was not a market purchase or sale. It was an acquisition coded as a grant or award of 27.6938 phantom stock units, representing dividends on prior deferrals, with no open-market trading and an exercise price recorded as $0.00 per unit.

When will Douglas G. DelGrosso’s CABOT CORP phantom stock units be settled?

DelGrosso’s phantom stock units will be settled when his service as a CABOT CORP director ends or as specified in his distribution election. The units represent deferred compensation and dividend equivalents, designed to be paid out in the future rather than immediately.

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

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Accepted by SEC EDGAR 06/16/2026 - 04:30 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^*

DELGROSSO DOUGLAS G

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
06/12/2026

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)	06/12/2026		A		27.6938		(2)	(2)	Common Stock	27.6938	$87.65	5,164.9539	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	06/16/2026
	** 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)