Cabot CEO Sean Keohane reports new stock grants and option award

Rhea-AI Filing Summary

Cabot Corporation President and CEO Sean D. Keohane, who is also a director, reported multiple equity awards dated 11/19/2025. He received 32,630 shares of common stock and an additional 30,932 performance-based units earned on fiscal 2025 results, with 22,630 of those units still subject to time-based vesting.

To cover obligations tied to these awards, 10,338 shares were disposed of at $59.76 per share. After these transactions, Keohane beneficially owned 404,134 Cabot common shares directly and 13,933.1846 shares indirectly through the company’s 401(k) plan. He was also granted an employee stock option for 122,114 shares at an exercise price of $59.76, vesting 30% on November 19, 2026, 30% on November 19, 2027 and 40% on November 19, 2028, expiring on November 18, 2035.

Insider Trade Summary

5 transactions reported

Mixed 5 txns

Insider Keohane Sean D

Role President and CEO

Type	Security	Shares	Price	Value
Grant/Award	Employee Stock Option (Right to Buy)	122,114	$0.00	--
Grant/Award	Common Stock	32,630	$0.00	--
Grant/Award	Common Stock	30,932	$0.00	--
Tax Withholding	Common Stock	10,338	$59.76	$618K
holding	Common Stock	--	--	--

Holdings After Transaction: Employee Stock Option (Right to Buy) — 122,114 shares (Direct); Common Stock — 383,540 shares (Direct); Common Stock — 13,933.185 shares (Indirect, Through the Trustee for the Corporation's 401(k) Plan)

Footnotes (1)

1. Consists of performance based units earned on the basis of the Corporation's performance in fiscal year 2025, of which 22,630 remain subject to time-based vesting. The option vests over a three year period as follows: 30% on November 19, 2026, 30% on November 19, 2027 and 40% on November 19, 2028.

Form 4 Insider Transactions: What Each Field Means →

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 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
X	Officer (give title below)		Other (specify below)
	President and CEO

3. Date of Earliest Transaction (Month/Day/Year)
11/19/2025

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
Common Stock	11/19/2025		A		32,630	A	$0	383,540	D
Common Stock	11/19/2025		A		30,932(1)	A	$0	414,472	D
Common Stock	11/19/2025		F		10,338	D	$59.76	404,134	D
Common Stock								13,933.1846	I	Through the Trustee for the Corporation's 401(k) Plan

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
Employee Stock Option (Right to Buy)	$59.76	11/19/2025		A		122,114		(2)	11/18/2035	Common Stock	122,114	$0	122,114	D

Explanation of Responses:

1. Consists of performance based units earned on the basis of the Corporation's performance in fiscal year 2025, of which 22,630 remain subject to time-based vesting.

2. The option vests over a three year period as follows: 30% on November 19, 2026, 30% on November 19, 2027 and 40% on November 19, 2028.

	By: Jennifer Lombardi, pursuant to a power of attorney from Sean D. Keohane	11/21/2025
	** 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 insider transaction did Cabot (CBT) report for Sean D. Keohane?

The report shows that Sean D. Keohane, President, CEO and director of Cabot Corporation, received equity awards and disposed of some shares on 11/19/2025.

How many Cabot (CBT) shares did the CEO acquire and dispose of?

On 11/19/2025, he acquired 32,630 common shares and 30,932 performance-based units, and disposed of 10,338 shares at $59.76 per share.

What is the size and exercise price of the new Cabot (CBT) stock option grant?

He was granted an employee stock option covering 122,114 Cabot common shares at an exercise price of $59.76 per share, expiring on November 18, 2035.

How and when do the new Cabot (CBT) options for the CEO vest?

The option vests over three years: 30% on November 19, 2026, 30% on November 19, 2027 and 40% on November 19, 2028.

How many Cabot (CBT) shares does the CEO beneficially own after the transactions?

After the reported transactions, he beneficially owned 404,134 Cabot common shares directly and 13,933.1846 shares indirectly through the company’s 401(k) plan.

What portion of the performance-based units for Cabot (CBT) is still subject to vesting?

Of the 30,932 performance-based units earned based on fiscal 2025 performance, 22,630 remain subject to time-based vesting conditions.