Form 4 for CSTL CASTLE BIOSCIENCES INC
Accepted 2026-08-04 16:36:12 ET · period of report 2026-07-31 · accession 0001628280-26-052648 · 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| MT | 2026-08-04 16:36 | 2026-07-31+ | CSTL | Juvenal Tobin W | Chief Commercial Off | S - Sale | $29.21 | -19.0K | 79.0K | -19% | -$556.2K |
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 | 2026-07-31 | S | D | 8,149 | $28.84 | 89,886 | D | — | — | (F1) This transaction was made pursuant to a Rule 10b5-1 plan adopted by the Reporting Person on December 10, 2025. (F2) This transaction was executed in multiple trades at prices ranging from $28.150 to $29.140, 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 | 2026-07-31 | S | D | 7,270 | $29.58 | 82,616 | D | — | — | (F1) This transaction was made pursuant to a Rule 10b5-1 plan adopted by the Reporting Person on December 10, 2025. (F3) This transaction was executed in multiple trades at prices ranging from $29.150 to $30.130, 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 | 2026-07-31 | S | D | 1,891 | $30.26 | 80,725 | D | — | — | (F1) This transaction was made pursuant to a Rule 10b5-1 plan adopted by the Reporting Person on December 10, 2025. (F4) This transaction was executed in multiple trades at prices ranging from $30.150 to $30.645, 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. |
| 4 | Common | Common Stock | 2026-08-03 | S | D | 1,730 | $28.25 | 78,995 | D | — | — | (F1) This transaction was made pursuant to a Rule 10b5-1 plan adopted by the Reporting Person on December 10, 2025. (F5) This transaction was executed in multiple trades at prices ranging from $28.030 to $28.630, 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. |