// insider-profile
Kirby William C.
This page tracks every SEC Form 4 filing by Kirby William C.: 4 transactions in total, including 1 open-market purchase and 0 sales. Each record is parsed directly from the original filing, with amendments reconciled so a corrected filing never double-counts.
// activity-summary
No insider transactions in the last 30 days.
// track-record
Most active in
Transaction History
Sourced from SEC EDGAR Form 4 filings. Updated hourly.
| Date | Insider | Company | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Feb 26, 2026 | Kirby William C. | TWN | Purchase | 50,686.9 | $64.90 | $3.29M |
| Jan 8, 2026 | Kirby William C. | CBT | Award | 486 | $0.00 | $0K |
| Jan 10, 2025 | Kirby William C. | CBT | Award | 1,788 | $0.00 | $0K |
| Jan 11, 2024 | Kirby William C. | CBT | Award | 2,035 | $0.00 | $0K |
// how to read this
Reading an insider's Form 4 history
Corporate insiders — directors, officers, and holders of more than 10% of a company's stock — must report their trades to the SEC on Form 4 within two business days. Looking at one insider's filings over time shows whether they tend to buy on the open market (a discretionary use of their own money, generally the strongest signal), sell, or simply receive and exercise equity awards as compensation.
The track record above measures how this insider's past open-market purchases performed in the months after each filing. Trades made under a pre-scheduled Rule 10b5-1 plan are flagged because they carry no timing signal. To pull any insider's full history programmatically, see the insider trading API or our guide to reading Form 4 filings.