William F. Masterson III
CIK: 0002098902
Transaction Breakdown
High conviction signal
Position reduction
Derivative conversions
Compensation grants
Gifts, tax withholding, conversions, dispositions to the issuer and other codes
Companies & Roles (1)
CABOT CORP
Discretionary Trading P&L
Holdings
Transaction History (7 total)
- Sep 30, 2026CBT
CABOT CORP
Award(A)DirectPhantom Stock Units
24 shares at avg. $76.91- - Sep 11, 2026CBT
CABOT CORP
Award(A)DirectPhantom Stock Units
3 shares at avg. $79.68- - Jun 12, 2026CBT
CABOT CORP
Award(A)DirectPhantom Stock Units
3 shares at avg. $87.65- - Mar 13, 2026CBT
CABOT CORP
Award(A)DirectPhantom Stock Units
3 shares at avg. $69.49- - Dec 31, 2025CBT
CABOT CORP
Award(A)DirectPhantom Stock Units
229 shares at avg. $66.28- - Dec 12, 2025CBT
CABOT CORP
Award(A)DirectPhantom Stock Units
2 shares at avg. $68.34- - Dec 3, 2025CBT
CABOT CORP
Award(A)Direct3.5K shares-
| Type | Shares | Price | Ownership | |||
|---|---|---|---|---|---|---|
| Sep 30, 2026 | CBT CABOT CORP | Award(A) Phantom Stock Units | 24 | $76.91 | - | Direct |
| Sep 11, 2026 | CBT CABOT CORP | Award(A) Phantom Stock Units | 3 | $79.68 | - | Direct |
| Jun 12, 2026 | CBT CABOT CORP | Award(A) Phantom Stock Units | 3 | $87.65 | - | Direct |
| Mar 13, 2026 | CBT CABOT CORP | Award(A) Phantom Stock Units | 3 | $69.49 | - | Direct |
| Dec 31, 2025 | CBT CABOT CORP | Award(A) Phantom Stock Units | 229 | $66.28 | - | Direct |
| Dec 12, 2025 | CBT CABOT CORP | Award(A) Phantom Stock Units | 2 | $68.34 | - | Direct |
| Dec 3, 2025 | CBT CABOT CORP | Award(A) | 3,486 | - | - | Direct |
1-7 of 7 transactions
About Masterson William F III
Masterson William F III (SEC CIK 0002098902) files insider reports with the SEC as Senior Vice President of CABOT CORP (CBT).
Signal8 holds 8 ownership filings by Masterson William F III (1 Form 3, 7 Form 4), filed between Dec 2, 2025 and Oct 1, 2026. Those filings report 7 transactions, from Dec 3, 2025 to Sep 30, 2026. Signal8's Form 4 history starts in Sep 2024.
The business address on Masterson William F III's filings is in BOSTON, MA.
Recent filings by Masterson William F III
- Sep 30, 2026: Grant or award of CBT derivative securities (Form 4, code A).
- Sep 11, 2026: Grant or award of CBT derivative securities (Form 4, code A).
- Jun 12, 2026: Grant or award of CBT derivative securities (Form 4, code A).
- Mar 13, 2026: Grant or award of CBT derivative securities (Form 4, code A).
- Dec 31, 2025: Grant or award of CBT derivative securities (Form 4, code A).
Other insiders filing for CABOT CORP (CBT)
- Delahunt Steven J, Interim CFO
- McLaughlin Erica, Executive Vice President, CFO
- Kalita Karen A, SVP and General Counsel
- Keohane Sean D, President and CEO
- Nathoo Raffiq, Director
- Dumont Lisa M, VP, Controller & CAO