Form 4 for CSTL CASTLE BIOSCIENCES INC
Accepted 2025-12-17 00:00:00 ET · period of report 2025-12-15 · accession 0001628280-25-057651 · 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 | 2025-12-17 | 2025-12-15+ | CSTL | MAETZOLD DEREK J | Pres, Chief Exec. Off, Dir | S - Sale | $38.69 | -32.3K | 34.9K | -48% | -$1.25M |
Every reported transaction
| # | Table | Security | Date | Code | A/D | Shares | Price | Owned after | Own | Exercise / expiry | Underlying | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | Common | Common Stock | 2025-12-15 | S | D | 18,513 | $38.75 | 48,702 | D | — | — | (F2) This transaction was executed in multiple trades at prices ranging from $38.240 to $39.220, 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 | 2025-12-15 | S | D | 1,012 | $39.30 | 47,690 | D | — | — | (F3) This transaction was executed in multiple trades at prices ranging from $39.240 to $39.390, 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 | 2025-12-16 | S | D | 12,821 | $38.55 | 34,869 | D | — | — | (F4) This transaction was executed in multiple trades at prices ranging from $38.135 to $39.070, 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. |