Form 4 for CSTL CASTLE BIOSCIENCES INC
Accepted 2025-12-11 00:00:00 ET · period of report 2025-12-09 · accession 0001628280-25-056631 · 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| DM | 2025-12-11 | 2025-12-09+ | CSTL | MAETZOLD DEREK J | Pres, Chief Exec. Off, Dir | M - OptEx | — | +48.9K | 73.3K | +201% | — |
| DM | 2025-12-11 | 2025-12-09+ | CSTL | MAETZOLD DEREK J | Pres, Chief Exec. Off, Dir | F - Tax | $38.18 | -19.3K | 57.9K | -25% | -$735.0K |
| DM | 2025-12-11 | 2025-12-09+ | CSTL | MAETZOLD DEREK J | Pres, Chief Exec. Off, Dir | M - OptEx | $0.00 | -48.9K | 33.5K | -59% | $0 |
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 | 2025-12-09 | M | A | 33,495 | — | 71,042 | D | — | — | (F1) Each Restricted Stock Unit ("RSU") represents the right to receive one share of the Issuer's Common Stock. |
| 2 | Common | Common Stock | 2025-12-10 | F | D | 6,070 | $38.02 | 67,215 | D | — | — | |
| 3 | Common | Common Stock | 2025-12-10 | M | A | 15,424 | — | 73,285 | D | — | — | (F1) Each Restricted Stock Unit ("RSU") represents the right to receive one share of the Issuer's Common Stock. |
| 4 | Common | Common Stock | 2025-12-09 | F | D | 13,181 | $38.25 | 57,861 | D | — | — | |
| 5 | Derivative | Restricted Stock Units | 2025-12-10 | M | D | 15,424 | $0.00 | 0 | D | — · — to — | 15,424 Common Stock | (F1) Each Restricted Stock Unit ("RSU") represents the right to receive one share of the Issuer's Common Stock. (F12) On December 10, 2021, the Reporting Person was granted 61,698 RSUs which vest in four equal installments beginning on December 10, 2022. |
| 6 | Derivative | Restricted Stock Units | 2025-12-09 | M | D | 33,495 | $0.00 | 33,496 | D | — · — to — | 33,495 Common Stock | (F1) Each Restricted Stock Unit ("RSU") represents the right to receive one share of the Issuer's Common Stock. (F11) On December 9, 2022, the Reporting Person was granted 133,983 RSUs which vest in four equal installments beginning on December 9, 2023. |