Insider · CIK 0002098902
William F Masterson III
Files at: CBT. On EDGAR ↗
Reported trades — common stock
No reported common-stock activity in this period.
Reported trades — derivatives (options, RSUs, warrants)
| Trade | Reported (ET) | Company | Shares | Avg price | Total | Owned after | Δ stake | Flags |
|---|---|---|---|---|---|---|---|---|
| Sep 11, 2026 AForm 4 → | Sep 14, 5:00 pm EDT | CABOT CORPCBT | 3 | $79.68 | $249 | 530 | — | |
| Jun 12, 2026 AForm 4 → | Jun 16, 4:30 pm EDT | CABOT CORPCBT | 3 | $87.65 | $247 | 527 | — |