William F Masterson III
CIK 2098902 · View on SEC EDGAR ↗
Insider
First SEC filing: Dec. 2, 2025 · Latest: June 16, 2026
On this page
Insider at
Insider transactions
0 buys (P)
0 sells (S)
Net:
$0
+ 6 non-open-market transactions below
last 12 months, based on the transactions shown below
Price change vs current quote, split-adjusted for corporate actions since the filing — not benchmarked, not annualized, not size-weighted
No open-market trades on record; showing all filings.
| Date | Ticker | Code | Shares | Price | Value | Owned after | Δ own | A/D | vs now |
|---|---|---|---|---|---|---|---|---|---|
| June 12, 2026 | CBT | A | 3 | $87.65 | $263 | 527 Direct | +0.57% | Acquired | -2.7% (price as of 2026-08-21) |
| March 13, 2026 | CBT | A | 3 | $69.49 | $208 | 524 Direct | +0.58% | Acquired | 22.8% (price as of 2026-08-21) |
| Dec. 31, 2025 | CBT | A | 229 | $66.28 | $15,178 | 520 Direct | +78.69% | Acquired | 28.7% (price as of 2026-08-21) |
| Dec. 12, 2025 | CBT | A | 2 | $68.34 | $137 | 292 Direct | +0.69% | Acquired | 24.8% (price as of 2026-08-21) |
| Dec. 3, 2025 | CBT | A | 12,767 | — | — | 12,767 Direct | — | Acquired | (price as of 2026-08-21) |
| Dec. 3, 2025 | CBT | A | 3,486 | — | — | 7,210 Direct | +93.61% | Acquired | (price as of 2026-08-21) |
P = Open-market purchase · S = Sale · A = Grant/award · M = Option exercise · G = Gift · F = Tax withholding
Insider transactions are not a recommendation; sales are often driven by liquidity or tax reasons.
Derivative holdings (Form 4 Table II)
Options, RSUs and convertible securities reported on Form 4 Table II.
| Date | Ticker | Security | Underlying | Exercise price | Expiration | Shares | A/D |
|---|---|---|---|---|---|---|---|
| June 12, 2026 | CBT | Phantom Stock Units | Common Stock (3) | — | — | 3 | Acquired |
| March 13, 2026 | CBT | Phantom Stock Units | Common Stock (3) | — | — | 3 | Acquired |
| Dec. 31, 2025 | CBT | Phantom Stock Units | Common Stock (229) | — | — | 229 | Acquired |
| Dec. 12, 2025 | CBT | Phantom Stock Units | Common Stock (2) | — | — | 2 | Acquired |
| Dec. 3, 2025 | CBT | Employee Stock Option (Right to Buy) | Common Stock (12,767) | $64.54 | Dec. 2, 2035 | 12,767 | Acquired |
Exercise/conversion price is blank when not applicable (e.g. RSUs).
Initial ownership (Form 3) 2 holdings
Securities held when first becoming an insider, per SEC Form 3.