Cabot SVP granted 3.1229 phantom stock units

CABOT CORP (CBT) reported that Senior Vice President William F. Masterson III received an automatic credit of 3.1229 Phantom Stock Units on September 11, 2026, as a grant/award acquisition tied to dividends under the company’s Supplemental 401(k) Plan.

Rhea-AI Filing Summary

CABOT CORP (CBT) reported that Senior Vice President William F. Masterson III received an automatic credit of 3.1229 Phantom Stock Units on September 11, 2026, as a grant/award acquisition tied to dividends under the company’s Supplemental 401(k) Plan. Each unit is linked 1-for-1 to a share of Cabot common stock and was valued at $79.68 per unit for this credit. Following this transaction, Masterson holds a total of 529.7416 Phantom Stock Units, which, according to the plan terms, are scheduled to be settled in Cabot common stock upon his retirement or other termination of employment. No Rule 10b5-1 trading plan is reported for this filing.

Insider Trade Summary

Grant/Award: 3.1229 shares

Grant/Award 1 txn

Insider Masterson William F III

Role Senior Vice President

Type	Security	Shares	Price	Value
Grant/Award	Phantom Stock Units F1, F2	3.1229	$79.68	$248.83

Holdings After Transaction: Phantom Stock Units — 529.7416 contracts (Direct)

Footnotes (2)

1. F1. 1 for 1
2. F2. Represents dividends paid on phantom stock units acquired under the Corporation's Supplemental 401(k) Plan and are to be settled upon the reporting person's retirement or other termination of employment.

Key Figures

Phantom Stock Units acquired: 3.1229 units Per-unit value: $79.68 per Phantom Stock Unit Total Phantom Stock Units after transaction: 529.7416 units +2 more

5 metrics

Phantom Stock Units acquired 3.1229 units Grant/award acquisition on September 11, 2026 as dividend credit

Per-unit value $79.68 per Phantom Stock Unit Value used for the September 11, 2026 Phantom Stock Unit credit

Total Phantom Stock Units after transaction 529.7416 units Direct holdings of Phantom Stock Units following the reported acquisition

Underlying common stock per unit 1 share per unit Footnote indicates a 1-for-1 link to Cabot common stock

Underlying shares for this grant 3.1229 shares Underlying Cabot common stock corresponding to the newly credited units

Key Terms

Phantom Stock Units, Supplemental 401(k) Plan, dividends, Common Stock

4 terms

Phantom Stock Units financial

"Represents dividends paid on phantom stock units acquired under the Corporation's Supplemental"

Phantom stock units are company promises that pay a cash or stock-equivalent award tied to the firm’s share price or value growth, but they do not issue actual shares. Think of them as a bonus check that moves with the stock like a mirror rather than handing over an ownership slice. Investors care because these awards can affect a company’s future cash obligations, executive incentives and reported expenses without causing share dilution.

Supplemental 401(k) Plan financial

"acquired under the Corporation's Supplemental 401(k) Plan and are to be settled"

dividends financial

"Represents dividends paid on phantom stock units acquired under the Corporation's"

Dividends are cash payments a company gives to its shareholders from profits or cash reserves, effectively sharing part of its earnings with owners. They matter to investors because they provide a steady income stream, act like an interest or rent payment on owning the stock, and signal management’s confidence in the business—factors that influence total return and share price. Regular or special dividends can change an investor’s income and reinvestment strategy.

Common Stock financial

"underlying_security_title: Common Stock"

Common stock represents ownership shares in a company, giving investors a stake in its success and a say in important decisions through voting rights. It is the most common type of stock traded on markets and can provide income through dividends, as well as potential for value growth. For investors, holding common stock means sharing in the company’s profits and risks.

FAQ

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

What insider transaction did CABOT CORP (CBT) report for William F. Masterson III?

Cabot reported that Senior Vice President William F. Masterson III received 3.1229 Phantom Stock Units on September 11, 2026 as a grant/award acquisition, credited as dividends on phantom stock units under the company’s Supplemental 401(k) Plan.

How many Phantom Stock Units in CBT does Masterson hold after this Form 4 transaction?

After the reported transaction, William F. Masterson III holds 529.7416 Phantom Stock Units directly. These units are designed to be settled in Cabot common stock upon his retirement or other termination of employment, according to the plan footnote.

What is the economic value per Phantom Stock Unit in the latest CBT Form 4?

Each Phantom Stock Unit in the September 11, 2026 transaction was valued at $79.68 per unit. The filing identifies this figure as the per-unit price used for the credited 3.1229 Phantom Stock Units linked to Cabot common stock.

How are Cabot (CBT) Phantom Stock Units from this filing ultimately settled?

According to the footnote, the Phantom Stock Units represent dividends on units acquired under Cabot’s Supplemental 401(k) Plan and are to be settled in Cabot common stock upon the reporting person’s retirement or other termination of employment.

Were Masterson’s CBT Phantom Stock Unit credits made under a Rule 10b5-1 plan?

No. The filing indicates the Rule 10b5-1 checkbox is not affirmed, and there is no footnote stating that the September 11, 2026 Phantom Stock Unit credit was executed pursuant to a Rule 10b5-1 or other pre-arranged trading plan.

What does the 1-for-1 reference mean for CBT Phantom Stock Units in this Form 4?

A footnote states “1 for 1”, meaning each Phantom Stock Unit corresponds 1-for-1 with one share of Cabot common stock as the underlying security. In this transaction, 3.1229 units correspond to 3.1229 underlying common shares.

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

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Available on EDGAR 09/14/2026 - 05:03 PM Accepted by SEC EDGAR 09/14/2026 - 05:00 PM 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^*

Masterson William F III

(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)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Senior Vice President

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
09/11/2026

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

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
Phantom Stock Units	(1)	09/11/2026		A		3.1229		(2)	(2)	Common Stock	3.1229	$79.68	529.7416	D

Explanation of Responses:

1. 1 for 1

2. Represents dividends paid on phantom stock units acquired under the Corporation's Supplemental 401(k) Plan and are to be settled upon the reporting person's retirement or other termination of employment.

	By: Jennifer Lombardi, pursuant to a power of attorney from William F. Masterson, III	09/14/2026
	** 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)