Form 4 for CSTL CASTLE BIOSCIENCES INC
Accepted 2026-03-17 00:00:00 ET · period of report 2026-03-13 · accession 0001628280-26-018813 · 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 | 2026-03-17 | 2026-03-13+ | CSTL | MAETZOLD DEREK J | Pres, Chief Exec. Off, Dir | S - Sale | $25.74 | -30.8K | 40.8K | -43% | -$792.4K |
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 | 2026-03-16 | S | D | 17,449 | $25.96 | 40,905 | D | — | — | (F3) This transaction was executed in multiple trades at prices ranging from $25.660 to $26.630, 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 | 2026-03-13 | S | D | 13,204 | $25.45 | 58,354 | D | — | — | (F2) This transaction was executed in multiple trades at prices ranging from $25.210 to $25.785, 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. |
| 3 | Common | Common Stock | 2026-03-16 | S | D | 126 | $26.68 | 40,779 | D | — | — |