William C. Kirby is Director at CABOT CORP (CBT). They have made 3 open-market trades across 1 company since 2020, most recently 2026-02-26.
CIK 0001413483
3 open-market purchases totalling $3.3M since 2020, never a sale. Too few scored purchases to measure a record yet.
| Ticker | Shares | Value |
|---|---|---|
| CBT | 27,688 | $2.1M |
| TWN | 2,886 | $271K |
| Total | $2.3M |
Shares reported on the most recent Form 4, priced at the 2026-02-27 close.
Counted per filing, not per execution lot — a purchase filled in several tranches is one decision.
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.