Key facts
- This page summarizes William F. Masterson III's Form 4 filing for CABOT CORP (CBT).
- 2 reported transactions and 1 derivative row are listed below.
- Accepted by SEC: 05 Dec 2025, 17:30.
William F. Masterson III - 03 Dec 2025 Form 4 Insider Report for CABOT CORP (CBT)
- Reporting relationship
- Senior Vice President
- Issuer ticker
- CBT
- Reported as of
- 03 Dec 2025
- Net transaction value
- $0
- SEC form
- 4
- Accepted by SEC
- 05 Dec 2025, 17:30:04 UTC
- Prior SEC filing
- 02 Dec 2025
- Next SEC filing
- 16 Dec 2025
- Source filing
- View source filing
- Reporting owner signature
- By: Jennifer Lombardi, pursuant to a power of attorney from William F. Masterson, III
Source evidence
Original filing metadata and source links for verification.
5 source fields
Reporting owner
1 detail
Key filing fact
William F. Masterson III filed Form 4 for CABOT CORP (CBT) on 05 Dec 2025.
Change
- Previous filing in this sequence was filed on 02 Dec 2025.
- Current net transaction value: $0.
Research use
- This tells you what this filing adds before you inspect full transaction and derivative tables.
- You can trace every row back to the original SEC filing document.
Evidence
Filed on Form 4
View source filing
Ownership activity is grounded in SEC Form 4 disclosures.
Reporting Owners (1)
CIK 0002098902
Primary reporting owner
Masterson William F III
- Relationship
- Senior Vice President
- Address
- C/O CABOT CORPORATION, TWO SEAPORT LANE, SUITE 1400, BOSTON
- Signature
- By: Jennifer Lombardi, pursuant to a power of attorney from William F. Masterson, III
- Signature date
- 05 Dec 2025
Reported non-derivative transactions
Shares, units, or other non-derivative securities reported in this filing.
CBT
transaction
Common Stock
Award
- Transaction value
- $0
- Shares
- +3,486
- Change %
- +94%
- Price
- $0.000000
- Shares after
- 7,210
- Date
- 03 Dec 2025
- Ownership
- Direct
Reported derivative securities
Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.
CBT
transaction
Derivative
Employee Stock Option (Right to Buy)
Award
- Transaction value
- $0
- Shares
- +12,767
- Change %
- Price
- $0.000000
- Shares after
- 12,767
- Date
- 03 Dec 2025
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 12,767
- Exercise price
- $64.54
- Footnotes
- F1
* marks a reported price that did not pass the local price check.
Additional SEC filing notes
Filing notes and footnotes
Explanation of responses 1 footnote
Footnote F1
The option vests over a three year period as follows: 30% on December 3, 2026, 30% on December 3, 2027 and 40% on December 3, 2028.