person · Reporting owner
Masterson William F III
Disclosed activity across 1 company
Sign in to followReported relationships
Latest disclosed role at each company.
| Company | Last reported as | Report date | Published |
|---|---|---|---|
| CABOT CORPCBT · Entity 4032 | Senior Vice President | September 30, 2026 | October 01, 2026 |
Disclosed balances
About these balances
Latest available filing per company, not a reconstructed current portfolio. Matching sequences show the last reported balance with all source rows expandable; grouping alone does not establish account ownership. Do not add unresolved positions together. Filings may omit unchanged positions, and amendments may correct only part of an older disclosure. Jointly reported shares are not necessarily this owner's personal holdings.
CABOT CORP
Report date September 30, 2026 · Filed October 01, 2026
| Security / award | Ownership account | Disclosed shares / units | Disclosure context |
|---|---|---|---|
| Phantom Stock UnitsSEC Table II · derivative / convertible security | Direct | 553.8957 |
Reported balance
After 2026-09-30 transaction · row 1
Instrument identity requires review; Table II rows are not merged.
1 source rowRow 1 · 2026-09-30 · Grant · Acquired 24.1542 · Balance 553.8957 F1: 1 for 1 F2: The reported phantom stock units were acquired under the Corporation's supplemental 401(k) plan and are to be settled upon the reporting person's retirement or other termination of service. |
Filing footnotes · ownership attribution and instrument terms
F1: 1 for 1
F2: The reported phantom stock units were acquired under the Corporation's supplemental 401(k) plan and are to be settled upon the reporting person's retirement or other termination of service.
Transaction history
JSON APIPurchases/sales include open-market and private transactions. Plan disclosure applies to the filing; individual rows may differ. “Not disclosed” is not “unplanned.”
The cutoff filters transaction history only. Company summaries and owner relationships show the latest available disclosures. Parser corrections can improve historical records.
| Transaction date | Company | Activity / security | Shares / units | Reported price | Reported value | Details |
|---|---|---|---|---|---|---|
| September 30, 2026 Filed Oct 1, 2026 23:49 UTC | CABOT CORP CBT · Entity 4032 | GrantPhantom Stock Units · Derivative | 24.1542 | $76.91 | $1,857.70 |
DisclosureSEC source: 0001193125-26-410606 · ownership.xml · derivative · entry 1 Masterson William F III · CIK 0002098902 · Senior Vice President 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 553.8957 Underlying: Common Stock · 24.1542 shares Expires not disclosed F1 · derivative.exercise_price: 1 for 1 F2 · derivative.exercise_date: The reported phantom stock units were acquired under the Corporation's supplemental 401(k) plan and are to be settled upon the reporting person's retirement or other termination of service. F2 · derivative.expiration_date: The reported phantom stock units were acquired under the Corporation's supplemental 401(k) plan and are to be settled upon the reporting person's retirement or other termination of service. Read SEC document |
| September 11, 2026 Filed Sep 14, 2026 21:00 UTC | CABOT CORP CBT · Entity 4032 | GrantPhantom Stock Units · Derivative | 3.1229 | $79.68 | $248.83 |
DisclosureSEC source: 0001193125-26-390732 · ownership.xml · derivative · entry 1 Masterson William F III · CIK 0002098902 · Senior Vice President 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 529.7416 Underlying: Common Stock · 3.1229 shares Expires not disclosed F1 · derivative.exercise_price: 1 for 1 F2 · derivative.exercise_date: 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. F2 · derivative.expiration_date: 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. Read SEC document |
| June 12, 2026 Filed Jun 16, 2026 20:30 UTC | CABOT CORP CBT · Entity 4032 | GrantPhantom Stock Units · Derivative | 2.8237 | $87.65 | $247.50 |
DisclosureSEC source: 0001193125-26-272676 · ownership.xml · derivative · entry 1 Masterson William F III · CIK 0002098902 · Senior Vice President 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 526.6187 Underlying: Common Stock · 2.8237 shares Expires not disclosed F1 · derivative.exercise_price: 1 for 1 F2 · derivative.exercise_date: 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. F2 · derivative.expiration_date: 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. Read SEC document |
| March 13, 2026 Filed Mar 17, 2026 21:00 UTC | CABOT CORP CBT · Entity 4032 | GrantPhantom Stock Units · Derivative | 3.3701 | $69.49 | $234.19 |
DisclosureSEC source: 0001193125-26-111108 · ownership.xml · derivative · entry 1 Masterson William F III · CIK 0002098902 · Senior Vice President 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 523.795 Underlying: Common Stock · 3.3701 shares Expires not disclosed F1 · derivative.exercise_price: 1 for 1 F2 · derivative.exercise_date: 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. F2 · derivative.expiration_date: 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. Read SEC document |
| December 31, 2025 Filed Jan 5, 2026 20:59 UTC | CABOT CORP CBT · Entity 4032 | GrantPhantom Stock Units · Derivative | 228.5882 | $66.28 | $15,150.83 |
DisclosureSEC source: 0001193125-26-002341 · ownership.xml · derivative · entry 1 Masterson William F III · CIK 0002098902 · Senior Vice President 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 520.4248 Underlying: Common Stock · 228.5882 shares Expires not disclosed F1 · derivative.exercise_price: 1 for 1 F2 · derivative.exercise_date: The reported phantom stock units were acquired under the Corporation's supplemental 401(k) plan and are to be settled upon the reporting person's retirement or other termination of service. F2 · derivative.expiration_date: The reported phantom stock units were acquired under the Corporation's supplemental 401(k) plan and are to be settled upon the reporting person's retirement or other termination of service. Read SEC document |
| December 12, 2025 Filed Dec 16, 2025 22:00 UTC | CABOT CORP CBT · Entity 4032 | GrantPhantom Stock Units · Derivative | 1.9091 | $68.34 | $130.47 |
DisclosureSEC source: 0001193125-25-321119 · ownership.xml · derivative · entry 1 Masterson William F III · CIK 0002098902 · Senior Vice President 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 291.8366 Underlying: Common Stock · 1.9091 shares Expires not disclosed F1 · derivative.exercise_price: 1 for 1 F2 · derivative.exercise_date: 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. F2 · derivative.expiration_date: 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. Read SEC document |
| December 03, 2025 Filed Dec 5, 2025 22:30 UTC | CABOT CORP CBT · Entity 4032 | GrantEmployee Stock Option (Right to Buy) · Derivative | 12,767 | $0.00 Strike: $64.54 | $0.00 |
DisclosureSEC source: 0001193125-25-309977 · ownership.xml · derivative · entry 2 Masterson William F III · CIK 0002098902 · Senior Vice President 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 12,767 Underlying: Common Stock · 12,767 shares Expires 2035-12-02 F1 · date: 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. F1 · derivative.exercise_date: 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. Read SEC document |
| December 03, 2025 Filed Dec 5, 2025 22:30 UTC | CABOT CORP CBT · Entity 4032 | GrantCommon Stock | 3,486 | $0.00 | $0.00 |
DisclosureSEC source: 0001193125-25-309977 · ownership.xml · nonDerivative · entry 1 Masterson William F III · CIK 0002098902 · Senior Vice President 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 7,210 Read SEC document |
Value uses the disclosed total when available, otherwise shares × reported transaction price. It is not an estimate of exercise cash cost or investment performance.