Cabot CEO sells 2,779 shares after option exercise

CABOT CORP (CBT) reported that President and CEO Sean D. Keohane exercised employee stock options and sold the resulting shares.

Rhea-AI Filing Summary

CABOT CORP (CBT) reported that President and CEO Sean D. Keohane exercised employee stock options and sold the resulting shares. On 2026-08-24 he exercised options for 2,779 shares of common stock at an exercise price of $50.00 per share, and the same day sold 2,779 shares of common stock at $85.50 per share. Following the option exercise, he held 134,895 option shares tied to that grant, and separately reported 14,263.7411 shares of common stock held indirectly through the trustee for the company’s 401(k) plan. A footnote states the original option covered 137,674 shares and vested over three years from 2018 to 2020.

Insider Trade Summary

Exercise and Sale: 2,779 shares ($99K approx. pre-tax spread)

Exercise and Sale 4 txns

Insider Keohane Sean D

Role President and CEO

Sold 2,779 shs ($238K)

Approx. gross sale proceeds $238K

Approx. exercise cost $139K

Approx. pre-tax spread $99K

Type	Security	Shares	Price	Value
Exercise	Employee Stock Option (Right to Buy) F1	2,779	$0.00	$0.00
Exercise	Common Stock	2,779	$50.00	$139K
Sale	Common Stock	2,779	$85.50	$238K
holding	Common Stock	--	--	--

Holdings After Transaction: Employee Stock Option (Right to Buy) — 134,895 contracts (Direct); Common Stock — 288,873 shares (Direct); Common Stock — 14,263.7411 shares (Indirect, Through the Trustee for the Corporation's 401(k) Plan)

Footnotes (1)

1. F1. 137,674 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: 2,779 shares Option Exercise Price: $50.00 per share Shares Sold: 2,779 shares +4 more

7 metrics

Options Exercised 2,779 shares Employee stock option exercise on 2026-08-24

Option Exercise Price $50.00 per share Exercise price of employee stock options

Shares Sold 2,779 shares Common stock sale on 2026-08-24

Sale Price $85.50 per share Reported transaction price for common stock sale

Options Held After Transaction 134,895 shares Shares subject to the option following the exercise

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

Original Option Grant Size 137,674 shares Total shares subject to the option, per footnote

Key Terms

Employee Stock Option, derivative security, indirect ownership, 401(k) Plan

4 terms

Employee Stock Option financial

"security_title: "Employee Stock Option (Right to Buy)""

An employee stock option is a promise that lets a worker buy company shares later at a predetermined price, often after they stay for a certain period or meet performance goals — think of it like a coupon that locks in today's price for a future purchase. It matters to investors because options align employees’ incentives with company performance, can increase the number of shares outstanding (dilution) when exercised, and represent a compensation cost that affects reported profits and shareholder value.

derivative security financial

"transaction_code_description: "Exercise or conversion of derivative security""

A derivative security is a financial contract whose value comes from the price or performance of something else, such as a stock, bond, commodity, or market index. For investors it acts like an insurance policy or a wager: it can be used to protect against losses, lock in prices, or amplify gains and losses, so it can change a portfolio’s risk and potential return without owning the underlying asset directly.

indirect ownership financial

""ownership_type": "indirect" for shares held through 401(k) plan"

401(k) Plan financial

"nature_of_ownership: "Through the Trustee for the Corporation's 401(k) Plan""

A 401(k) plan is a workplace retirement account that lets employees set aside part of their pay into a tax-advantaged savings pot, often with employers adding matching contributions — like a workplace piggy bank for future income. It matters to investors because the amount people save and how employers fund these plans influence consumer spending, corporate payroll costs and the flow of money into financial markets, which can affect stock prices and company valuations.

FAQ

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

What insider transaction did CBT CEO Sean D. Keohane report on this Form 4?

He reported exercising employee stock options for 2,779 shares of Cabot common stock at an exercise price of $50.00 per share and selling 2,779 shares of common stock on 2026-08-24 at $85.50 per share.

How many Cabot (CBT) options related to this grant does Sean D. Keohane hold after the transaction?

After the reported option exercise, Sean D. Keohane held 134,895 shares subject to the employee stock option referenced in the filing, according to the post-transaction derivative holdings figure.

What indirect Cabot (CBT) shareholding does Sean D. Keohane report?

He reports 14,263.7411 shares of Cabot common stock held indirectly through the trustee for the corporation’s 401(k) plan, as a separate indirect ownership line item.

What were the key prices in Sean D. Keohane’s Cabot (CBT) Form 4 transactions?

The employee stock options had an exercise price of $50.00 per share. The related sale of Cabot common stock was reported at a transaction price of $85.50 per share.

What was the size and vesting of the original Cabot (CBT) option grant in this Form 4?

A footnote states the original option covered 137,674 shares and vested over three years: 30% on November 10, 2018, 30% on November 10, 2019, and 40% on November 10, 2020.

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

Form 4 Insider Transactions: What Each Field Means →

See more from StockTitan in Google Search and AI answers. Adds StockTitan as a preferred source · opens Google

Add on Google Not now

Available on EDGAR 08/26/2026 - 02:43 PM EDT Accepted by SEC EDGAR 08/26/2026 - 02:42 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)
08/24/2026

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	08/24/2026		M		2,779	A	$50	291,652	D
Common Stock	08/24/2026		S		2,779	D	$85.5	288,873	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)	$50	08/24/2026		M		2,779		(1)	11/08/2028	Common Stock	2,779	$0.00	134,895	D

Explanation of Responses:

1. 137,674 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: Mazda Cintron, pursuant to a power of attorney from Sean D. Keohane	08/26/2026
	** 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)