Form 4 for CSTL CASTLE BIOSCIENCES INC
Accepted 2026-05-27 16:17:46 ET · period of report 2026-05-22 · accession 0001628280-26-038473 · 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 | 2026-05-27 16:17 | 2026-05-22 | CSTL | Olson Tiffany | Dir | M - OptEx | — | +13.7K | 39.6K | +53% | — |
| D | 2026-05-27 16:17 | 2026-05-22 | CSTL | Olson Tiffany | Dir | M - OptEx | $0.00 | -13.7K | 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 | 2026-05-22 | M | A | 13,667 | — | 39,573 | 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 | 2026-05-22 | M | D | 13,667 | $0.00 | 0 | D | — · — to — | 13,667 Common Stock | (F1) Each Restricted Stock Unit ("RSU") represents the right to receive one share of the Issuer's Common Stock. (F2) The RSUs vest in full on the earlier of the (a) one-year anniversary of the date on May 22, 2026, or (b) the day immediately preceding the next Annual Meeting of Stockholders following the date of the grant. (F2) The RSUs vest in full on the earlier of the (a) one-year anniversary of the date on May 22, 2026, or (b) the day immediately preceding the next Annual Meeting of Stockholders following the date of the grant. |