Form 4 for CSTL CASTLE BIOSCIENCES INC
Accepted 2026-01-07 00:00:00 ET · period of report 2026-01-05 · accession 0001628280-26-001161 · SEC index · Original document
Summary rows
Aggregated the way they appear in lists: one row per insider, transaction code and security table.
| X | Filed | Traded | Ticker | Insider | Title | Type | Price | Qty | Owned | ΔOwn | Value |
|---|---|---|---|---|---|---|---|---|---|---|---|
| M | 2026-01-07 | 2026-01-05+ | CSTL | MAETZOLD DEREK J | Pres, Chief Exec. Off, Dir | S - Sale | $38.76 | -4,017 | 29.5K | -12% | -$155.7K |
Purchase Sale Sale after option exercise All abbreviations
Every reported transaction
| # | Table | Security | Date | Code | A/D | Shares | Price | Owned after | Own | Exercise / expiry | Underlying | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | Common | Common Stock | 2026-01-05 | S | D | 2,678 | $38.09 | 30,852 | D | — | — | (F2) This transaction was executed in multiple trades at prices ranging from $37.970 to $38.450, inclusive. The price reported above reflects the weighted-average sale price. The Reporting Person hereby undertakes to provide upon request to the Securities and Exchange Commission staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected. |
| 2 | Common | Common Stock | 2026-01-06 | S | D | 1,339 | $40.10 | 29,513 | D | — | — | (F3) This transaction was executed in multiple trades at prices ranging from $40.000 to $40.255, inclusive. The price reported above reflects the weighted-average sale price. The Reporting Person hereby undertakes to provide upon request to the Securities and Exchange Commission staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected. |