Cabot SVP granted phantom stock dividend units

Cabot Corp Senior Vice President William F. Masterson III received a grant of 2.8237 Phantom Stock Units on Common Stock as a compensation-related award.

Filing Impact

(Neutral)

Filing Sentiment

(Neutral)

Form Type

Rhea-AI Filing Summary

Cabot Corp Senior Vice President William F. Masterson III received a grant of 2.8237 Phantom Stock Units on Common Stock as a compensation-related award. These units were credited as dividends on prior phantom holdings under the company’s Supplemental 401(k) Plan and convert 1-for-1 into Cabot common stock equivalents. Following this grant, his phantom stock balance stands at 526.6187 units, which will be settled in shares after retirement or other termination of employment.

Insider Trade Summary

Grant/Award: 2.8237 shares

Grant/Award 1 txn

Insider Masterson William F III

Role Senior Vice President

Type	Security	Shares	Price	Value
Grant/Award	Phantom Stock Units	2.8237	$87.65	$247.50

Holdings After Transaction: Phantom Stock Units — 526.6187 contracts (Direct)

Footnotes (2)

F1. 1 for 1
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 units granted: 2.8237 units Reference price per unit: $87.6500 per unit Total phantom units after grant: 526.6187 units +1 more

4 metrics

Phantom units granted 2.8237 units Phantom Stock Units credited as dividend equivalents on 2026-06-12

Reference price per unit $87.6500 per unit Transaction price per Phantom Stock Unit on 2026-06-12

Total phantom units after grant 526.6187 units Phantom Stock Units held following the reported transaction

Conversion ratio 1-for-1 Each Phantom Stock Unit tracks one share of Cabot common stock

Key Terms

Phantom Stock Units, Supplemental 401(k) Plan, dividends paid on phantom stock units

3 terms

Phantom Stock Units financial

"Phantom Stock Units acquired as a grant, with underlying Common Stock"

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 paid on phantom stock units financial

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

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 Corp reported that Senior Vice President William F. Masterson III received 2.8237 Phantom Stock Units. These units represent dividend equivalents credited under the Supplemental 401(k) Plan and increase his deferred phantom stock balance rather than reflecting an open-market trade.

What are the terms of the Phantom Stock Units granted to the Cabot Corp executive?

The Phantom Stock Units convert to Cabot common stock on a 1-for-1 basis. They were granted as dividend equivalents on existing phantom units and will be settled in shares when the executive retires or otherwise leaves employment, rather than immediately delivering stock or cash.

How many Phantom Stock Units does the Cabot Corp executive hold after this Form 4 transaction?

After this acquisition, the executive holds a total of 526.6187 Phantom Stock Units. These units track the value of Cabot Corp common stock and are part of a deferred compensation arrangement, to be settled in shares at retirement or employment termination.

Was the Cabot Corp Form 4 transaction a market buy or sell of CBT shares?

No, the transaction was not a market buy or sell of CBT shares. It was an acquisition of 2.8237 Phantom Stock Units as dividend equivalents within a Supplemental 401(k) Plan, classified as a grant or award rather than an open-market trade in the company’s stock.

How are the Cabot Corp Phantom Stock Units in this filing settled for the executive?

The Phantom Stock Units are scheduled to be settled upon the executive’s retirement or other termination of employment. At that time, the units convert on a 1-for-1 basis into Cabot Corp common stock equivalents, providing deferred equity-based compensation instead of immediate share delivery.

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

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Accepted by SEC EDGAR 06/16/2026 - 04:30 PM

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)
06/12/2026

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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)

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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
Phantom Stock Units	⁽¹⁾	06/12/2026		A		2.8237		⁽²⁾	⁽²⁾	Common Stock	2.8237	$87.65	526.6187	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	06/16/2026
	** 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)

Source: View Original Filing on SEC EDGAR

Cabot SVP granted phantom stock dividend units

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