Cabot interim CFO reports 5,399 directly held shares

Delahunt’s phantom stock will be settled in Cabot common shares upon termination of employment, in accordance with his distribution elections.

Rhea-AI Filing Summary

Cabot Corporation (CBT) reports Interim CFO Steven J. Delahunt’s holdings as of October 1, 2026: 5,399 common shares directly, 2.4733 common shares indirectly through the Corporation’s 401(k) Plan, and 3,771.7730 shares of phantom stock. The direct position consists of 1,113 performance-based units earned for fiscal 2024 and 2025, which remain subject to time-based vesting, and 4,286 units subject to time-based vesting. Each phantom share is economically equivalent to one common share and will be settled in common shares upon termination of his employment, in accordance with his distribution elections.

Insider Trade Summary

3 transactions reported

Mixed 3 txns

Insider Delahunt Steven J

Role Interim CFO

Type	Security	Shares	Price	Value
holding	Phantom Stock F2	--	--	--
holding	Common Stock F1	--	--	--
holding	Common Stock	--	--	--

Holdings After Transaction: Phantom Stock — 3,771.773 contracts (Direct); Common Stock — 5,399 shares (Direct); Common Stock — 2.4733 shares (Indirect, Through the Trustee for the Corporation's 401(k) Plan)

Footnotes (2)

1. F1. Consists of 1,113 performance based units earned on the basis of the Corporation's performance in fiscal years 2024 and 2025 (which remain subject to time-based vesting) and 4,286 units subject to time-based vesting.
2. F2. Each share of phantom stock is the economic equivalent of one share of Cabot Corporation common stock. The shares of phantom stock will be settled in shares of Cabot Corporation common stock upon termination of his employment with Cabot Corporation and in accordance with his distribution elections.

Key Figures

Direct common stock: 5,399 shares Indirect common stock: 2.4733 shares Phantom stock: 3,771.7730 shares +2 more

5 metrics

Direct common stock 5,399 shares Steven J. Delahunt, as of October 1, 2026

Indirect common stock 2.4733 shares Held through the Corporation’s 401(k) Plan, as of October 1, 2026

Phantom stock 3,771.7730 shares Steven J. Delahunt, as of October 1, 2026

Performance-based units 1,113 units Earned on the basis of Corporation performance in fiscal years 2024 and 2025; remain subject to time-based vesting

Units subject to time-based vesting 4,286 units Included in the reported direct position

Key Terms

phantom stock, performance based units, time-based vesting, distribution elections

4 terms

phantom stock financial

"Each share of phantom stock is the economic equivalent"

A phantom stock is a form of compensation that gives employees or executives the benefits of stock ownership, such as the increase in stock value, without actually giving them real shares. It acts like a promise to pay the employee the equivalent value of company stock later, often as a bonus or incentive. This allows companies to motivate and reward staff without diluting ownership or transferring actual shares.

performance based units financial

"Consists of 1,113 performance based units earned"

time-based vesting financial

"which remain subject to time-based vesting"

Time-based vesting is a schedule that gives employees or contractors ownership of granted stock or options gradually as they remain with a company, like unlocking rewards in a loyalty program the longer you stick around. For investors, it matters because it affects future share supply, management incentives and staff retention — all of which can influence company performance and dilution of existing shareholders.

distribution elections financial

"in accordance with his distribution elections"

FAQ

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

How many CBT shares did Interim CFO Steven J. Delahunt report?

As of October 1, 2026, Steven J. Delahunt reported 5,399 common shares directly, 2.4733 common shares indirectly through Cabot Corporation’s 401(k) Plan, and 3,771.7730 shares of phantom stock.

How does Cabot phantom stock work?

Each phantom share is the economic equivalent of one Cabot common share. The phantom stock will be settled in Cabot common shares when Steven J. Delahunt’s employment ends, in accordance with his distribution elections.

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

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Available on EDGAR 10/07/2026 - 04:00 PM Accepted by SEC EDGAR 10/07/2026 - 04:00 PM Learn about SEC filing dates

SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

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:			3235-0104
Estimated average burden
hours per response:			0.5

1. Name and Address of Reporting Person^*

Delahunt Steven J

(Last) (First) (Middle)

C/O CABOT CORPORATION

TWO SEAPORT LANE, SUITE 1400

(Street)

BOSTON MASSACHUSETTS 02210

(City) (State) (Zip)

UNITED STATES

(Country)

2. Date of Event Requiring Statement (Month/Day/Year)
10/01/2026

3. Issuer Name and Ticker or Trading Symbol
CABOT CORP [ CBT ]

3a. Foreign Trading Symbol

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

4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Interim CFO

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 Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Common Stock	5,399(1)	D
Common Stock	2.4733	I	Through the Trustee for the Corporation's 401(k) Plan

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Phantom Stock	(2)	(2)	Common Stock	3,771.773	$0	D

Explanation of Responses:

1. Consists of 1,113 performance based units earned on the basis of the Corporation's performance in fiscal years 2024 and 2025 (which remain subject to time-based vesting) and 4,286 units subject to time-based vesting.

2. Each share of phantom stock is the economic equivalent of one share of Cabot Corporation common stock. The shares of phantom stock will be settled in shares of Cabot Corporation common stock upon termination of his employment with Cabot Corporation and in accordance with his distribution elections.

Remarks:

Exhibit-24 Power of Attorney attached.

	By: Jennifer Lombardi, pursuant to a power of attorney from Steven J. Delahunt	10/07/2026
	** 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 5 (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 3: SEC 1473 (03-26)