Cabot Corp (CBT) director William C. Kirby reports 486-share equity award

Rhea-AI Filing Summary

Cabot Corporation director William C. Kirby reported an acquisition of 486 shares of Cabot common stock on January 8, 2026, at a price of $0 per share. These shares were acquired as a form of compensation rather than through an open-market purchase, and are linked to Cabot's Non-Employee Directors' Deferral Plan. Following this transaction, Kirby beneficially owned 27,688 shares of Cabot common stock in direct form.

The filing characterizes this as a non-derivative, compensation-related award, reflecting ongoing equity-based alignment between the director and the company.

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^*

Kirby William C.

(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
	Officer (give title below)		Other (specify below)

3. Date of Earliest Transaction (Month/Day/Year)
01/08/2026

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	01/08/2026		A		486(1)	A	$0	27,688	D

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

Explanation of Responses:

1. The shares have been deferred pursuant to Cabot's Non-Employee Directors' Deferral Plan.

	By: Jennifer Lombardi, pursuant to a power of attorney from William C. Kirby	01/12/2026
	** 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.

FAQ

What insider transaction did Cabot Corp (CBT) report for William C. Kirby?

Cabot Corp director William C. Kirby reported acquiring 486 shares of Cabot common stock on January 8, 2026, coded as an acquisition of non-derivative securities.

At what price were the Cabot Corp (CBT) shares acquired by William C. Kirby?

The 486 shares of Cabot Corp common stock were reported as acquired at a price of $0 per share, indicating compensation or deferred equity rather than a market purchase.

How many Cabot Corp (CBT) shares does William C. Kirby own after this transaction?

After the reported transaction, William C. Kirby beneficially owned 27,688 shares of Cabot Corp common stock in direct ownership form.

What plan governs the deferred shares for Cabot Corp director William C. Kirby?

The filing states that the shares have been deferred pursuant to Cabot's Non-Employee Directors' Deferral Plan, indicating they are part of a director compensation and deferral program.

What is William C. Kirby’s relationship to Cabot Corp (CBT)?

William C. Kirby is identified in the filing as a director of Cabot Corp, with the Form 4 marked as filed by one reporting person.

Does the Cabot Corp (CBT) Form 4 involve derivative securities?

No derivative securities are reported in this Form 4 excerpt; it lists only a non-derivative common stock acquisition of 486 shares.