Form 4 for CSTL CASTLE BIOSCIENCES INC
Accepted 2025-12-11 00:00:00 ET · period of report 2025-12-09 · accession 0001628280-25-056629 · 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 | Oelschlager Kristen M | COO | F - Tax | $38.17 | -7,243 | 23.6K | -23% | -$276.5K |
| DM | 2025-12-11 | 2025-12-09+ | CSTL | Oelschlager Kristen M | COO | M - OptEx | — | +22.1K | 28.3K | +360% | — |
| DM | 2025-12-11 | 2025-12-09+ | CSTL | Oelschlager Kristen M | COO | M - OptEx | $0.00 | -22.1K | 0 | -100% | $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 | 2025-12-10 | F | D | 2,552 | $38.02 | 27,211 | D | — | — | |
| 2 | Common | Common Stock | 2025-12-10 | M | A | 6,170 | — | 29,763 | D | — | — | (F1) Each Restricted Stock Unit ("RSU") represents the right to receive one share of the Issuer's Common Stock. |
| 3 | Common | Common Stock | 2025-12-09 | F | D | 4,691 | $38.25 | 23,593 | D | — | — | |
| 4 | Common | Common Stock | 2025-12-09 | M | A | 15,961 | — | 28,284 | D | — | — | (F1) Each Restricted Stock Unit ("RSU") represents the right to receive one share of the Issuer's Common Stock. |
| 5 | Derivative | Restricted Stock Units | 2025-12-09 | M | D | 15,961 | $0.00 | 15,961 | D | — · — to — | 15,961 Common Stock | (F1) Each Restricted Stock Unit ("RSU") represents the right to receive one share of the Issuer's Common Stock. (F3) On December 9, 2022, the Reporting Person was granted 63,844 RSUs which vest in four equal installments beginning on December 9, 2023. |
| 6 | Derivative | Restricted Stock Units | 2025-12-10 | M | D | 6,170 | $0.00 | 0 | D | — · — to — | 6,170 Common Stock | (F1) Each Restricted Stock Unit ("RSU") represents the right to receive one share of the Issuer's Common Stock. (F4) On December 10, 2021, the Reporting Person was granted 24,679 RSUs which vest in four equal installments beginning on December 10, 2022. |