[Form 4] Cabot Corporation Insider Trading Activity

Rhea-AI Filing Summary

Sean D. Keohane, President and CEO and a director of Cabot Corporation (CBT), reported option exercises and open-market sales on 08/14/2025. He exercised two employee stock options totaling 114,436 shares (26,455 at $49.26 and 87,981 at $50.46) and sold 114,436 shares in multiple transactions at weighted average prices disclosed for each tranche, with sale prices in the reported ranges of $78.570 to $79.740. After these transactions he beneficially owned 361,518 shares directly and an additional 13,842.5928 shares indirectly through the company 401(k) plan trustee, for a combined disclosed position.

Positive

• Substantial retained ownership: Reporting person continues to hold 361,518 shares directly plus 13,842.5928 shares indirectly via the 401(k) plan.
• Detailed disclosure: Form 4 provides tranche-level sale price ranges and vesting history, supporting transparency and regulatory compliance.

Negative

• Significant sales on single date: 114,436 shares were sold on 08/14/2025 in multiple transactions.
• Sales executed at market prices: Reported sale price ranges span $78.570 to $79.740, indicating realized liquidity following option exercises.

Insights

Financial Analyst

TL;DR: CEO exercised options then sold an equal number of shares, leaving a substantial remaining direct holding.

Keohane exercised employee stock options for 114,436 shares at exercise prices of $49.26 and $50.46, then sold 114,436 shares in multiple transactions on the same date. Sales occurred at weighted average prices and reported price ranges between $78.570 and $79.740, implying a gross spread versus exercise prices. Post transactions, reported direct beneficial ownership was 361,518 shares plus 13,842.5928 shares held indirectly in the 401(k) plan. For investors, these are routine insider liquidity events following option vesting rather than an ownership exit; the filing is a standard Section 16 disclosure and contains granular pricing details by tranche.

Corporate Governance Expert

TL;DR: Transaction is a standard Section 16 disclosure of option exercise and subsequent sales, properly reported by POA.

The Form 4 shows the reporting person acting through a power of attorney for filing compliance. The report documents option exercises that vested in prior years and contemporaneous open-market sales, with full explanatory footnotes giving per-tranche price ranges and vesting history for the options. The filing provides required transparency on beneficial ownership changes; there is no indication of amendment or corrective disclosure beyond the single Form 4 filing date.

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
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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)
08/14/2025

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	08/14/2025		M		87,981	A	$50.46	449,499	D
Common Stock	08/14/2025		S		80,304	D	$79.242(1)	369,195	D
Common Stock	08/14/2025		S		7,677	D	$79.6178(2)	361,518	D
Common Stock	08/14/2025		M		26,455	A	$49.26	387,973	D
Common Stock	08/14/2025		S		24,086	D	$79.2487(3)	363,887	D
Common Stock	08/14/2025		S		2,369	D	$79.6262(4)	361,518	D
Common Stock								13,842.5928	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)	$49.26	08/14/2025		M		26,455		(5)	03/20/2026	Common Stock	26,455	$0.00	0	D
Employee Stock Option (Right to Buy)	$50.46	08/14/2025		M		87,981		(6)	11/10/2026	Common Stock	87,981	$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 $78.570 to $79.565, 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. The price reported is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $79.570 to $79.690, 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.

3. The price reported is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $78.580 to $79.570, 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.

4. The price reported is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $79.580 to $79.740, 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.

5. 26,455 shares were subject to the option. The option vested over a three year period as follows: 30% on March 21, 2017, 30% on March 21, 2018 and 40% on March 21, 2019.

6. 87,981 shares were subject to the option. The option vested over a three year period as follows: 30% on November 11, 2017, 30% on November 11, 2018 and 40% on November 11, 2019.

	By: Jennifer M. Lombardi, pursuant to a power of attorney from Sean D. Keohane	08/15/2025
	** 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 transactions did Sean D. Keohane report on the Form 4 for CBT?

He exercised employee stock options for 26,455 and 87,981 shares and sold 114,436 shares in multiple transactions on 08/14/2025.

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

Reported direct ownership: 361,518 shares; Indirect via 401(k): 13,842.5928 shares.

At what prices were the shares sold according to the Form 4?

Sales occurred at weighted average prices with tranche ranges disclosed, spanning $78.570 to $79.740 across the reported sales.

What were the exercise prices for the options exercised by the reporting person?

The exercised employee stock options had exercise prices of $49.26 (26,455 shares) and $50.46 (87,981 shares).

Was the Form 4 filed individually or by more than one reporting person?

The Form 4 was filed by one reporting person and executed on the filing by Jennifer M. Lombardi pursuant to a power of attorney from Sean D. Keohane.