Form 4 for CSTL CASTLE BIOSCIENCES INC
Accepted 2026-03-30 00:00:00 ET · period of report 2026-03-26 · accession 0001628280-26-022133 · 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| D | 2026-03-30 | 2026-03-26 | CSTL | Cotton Rodney | Dir | M - OptEx | — | +5,329 | 19.3K | +38% | — |
| D | 2026-03-30 | 2026-03-26 | CSTL | Cotton Rodney | Dir | M - OptEx | $0.00 | -5,329 | 5,330 | -50% | $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 | 2026-03-26 | M | A | 5,329 | — | 19,331 | D | — | — | (F1) Each Restricted Stock Unit ("RSU") represents the right to receive one share of the Issuer's Common Stock. |
| 2 | Derivative | Restricted Stock Units | 2026-03-26 | M | D | 5,329 | $0.00 | 5,330 | D | — · — to — | 5,329 Common Stock | (F1) Each Restricted Stock Unit ("RSU") represents the right to receive one share of the Issuer's Common Stock. (F2) On March 26, 2024, the Reporting Person was granted 15,988 RSUs which vest in three equal annual installments beginning on March 26, 2025. |