Cabot CEO exercises options, sells 91,923 shares

CABOT CORP President and CEO Sean D. Keohane exercised an employee stock option for 91,923 shares of common stock at an exercise price of $62.24 per share on August 7, 2026.

Rhea-AI Filing Summary

CABOT CORP President and CEO Sean D. Keohane exercised an employee stock option for 91,923 shares of common stock at an exercise price of $62.24 per share on August 7, 2026. The same day, he sold 91,923 common shares at a weighted average price of $86.4053 per share in multiple transactions at prices ranging from $85.970 to $86.815. The option, which covered 91,923 shares and vested between 2018 and 2020, now has 0 options remaining. Keohane continues to hold 14,263.7411 shares of common stock indirectly through the trustee for the corporation's 401(k) plan.

Insider Trade Summary

Exercise and Sale: 91,923 shares ($2.22M approx. pre-tax spread)

Exercise and Sale 4 txns

Insider Keohane Sean D

Role President and CEO

Sold 91,923 shs ($7.94M)

Approx. gross sale proceeds $7.94M

Approx. exercise cost $5.72M

Approx. pre-tax spread $2.22M

Type	Security	Shares	Price	Value
Exercise	Employee Stock Option (Right to Buy) F2	91,923	$0.00	$0.00
Exercise	Common Stock	91,923	$62.24	$5.72M
Sale	Common Stock F1	91,923	$86.4053	$7.94M
holding	Common Stock	--	--	--

Holdings After Transaction: Employee Stock Option (Right to Buy) — 0 contracts (Direct); Common Stock — 404,134 shares (Direct); Common Stock — 14,263.7411 shares (Indirect, Through the Trustee for the Corporation's 401(k) Plan)

Footnotes (2)

1. F1. The price reported is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $85.970 to $86.815, inclusive. The reporting person undertakes to provide to the staff of the Securities and Exchange Commission, the Corporation or any security holder of the Corporation, upon request, full information regarding the number of shares sold at each separate price.
2. F2. 91,923 shares were subject to the option. The option vested over a three year period as follows: 30% on November 10, 2018, 30% on November 10, 2019, and 40% on November 10, 2020.

Key Figures

Options exercised: 91,923 shares Option exercise price: $62.24 per share Shares sold: 91,923 shares +3 more

6 metrics

Options exercised 91,923 shares Employee stock option for common stock exercised on August 7, 2026

Option exercise price $62.24 per share Exercise price of employee stock option covering 91,923 shares

Shares sold 91,923 shares Common stock sold on August 7, 2026 following option exercise

Weighted average sale price $86.4053 per share Weighted average price for 91,923 shares sold, range $85.970–$86.815

Indirect holdings 14,263.7411 shares Common stock held through trustee for the corporation's 401(k) plan after transactions

Option expiration date November 9, 2027 Expiration date of the exercised employee stock option

Key Terms

Employee Stock Option (Right to Buy), weighted average sale price, indirect, vested

4 terms

Employee Stock Option (Right to Buy) financial

"Security title listed as "Employee Stock Option (Right to Buy)" for 91,923 shares"

weighted average sale price financial

"The price reported is a weighted average sale price. These shares were sold"

indirect financial

"Ownership type reported as indirect through the Trustee for the Corporation's 401(k) Plan"

vested financial

"The option vested over a three year period as follows: 30% on November 10, 2018"

FAQ

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

What did CABOT CORP (CBT) CEO Sean D. Keohane do in this Form 4?

Sean D. Keohane exercised 91,923 stock options at $62.24 per share and sold 91,923 common shares at a weighted average price of $86.4053 on August 7, 2026.

What was the sale price range for CABOT CORP (CBT) shares sold by the CEO?

The CEO’s 91,923 CABOT CORP shares were sold at a weighted average of $86.4053, in multiple transactions with prices ranging from $85.970 to $86.815 per share.

What were the terms of the stock option exercised by the CABOT CORP (CBT) CEO?

The exercised employee stock option covered 91,923 shares at an exercise price of $62.24 per share and was scheduled to expire on November 9, 2027 after vesting in stages from 2018 to 2020.

How many CABOT CORP (CBT) shares does the CEO still hold after this transaction?

After the reported transactions, Sean D. Keohane holds 14,263.7411 CABOT CORP shares indirectly, through the trustee for the corporation's 401(k) plan, as disclosed in the filing.

Was the CABOT CORP (CBT) CEO’s sale under a Rule 10b5-1 trading plan?

The filing’s Rule 10b5-1 checkbox is not marked as an affirmative plan, and the footnotes do not reference any Rule 10b5-1 trading arrangement for these transactions.

Did the CABOT CORP (CBT) CEO retain any of the shares from the exercised options?

The filing shows the 91,923 option shares were exercised and then sold on the same date. The option position is reduced to 0 shares, with remaining holdings reported only through the 401(k) plan.

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

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Accepted by SEC EDGAR 08/11/2026 - 06:00 PM EDT 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^*

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)
08/07/2026

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
Common Stock	08/07/2026		M		91,923	A	$62.24	496,057	D
Common Stock	08/07/2026		S		91,923	D	$86.4053(1)	404,134	D
Common Stock								14,263.7411	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)	$62.24	08/07/2026		M		91,923		(2)	11/09/2027	Common Stock	91,923	$0.00	0	D

Explanation of Responses:

1. The price reported is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $85.970 to $86.815, inclusive. The reporting person undertakes to provide to the staff of the Securities and Exchange Commission, the Corporation or any security holder of the Corporation, upon request, full information regarding the number of shares sold at each separate price.

2. 91,923 shares were subject to the option. The option vested over a three year period as follows: 30% on November 10, 2018, 30% on November 10, 2019, and 40% on November 10, 2020.

	By: Jennifer M. Lombardi, pursuant to a power of attorney from Sean D. Keohane	08/11/2026
	** 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)