Form 4 for CSTL CASTLE BIOSCIENCES INC
Accepted 2026-08-26 16:16:51 ET · period of report 2026-08-24 · accession 0001628280-26-059091 · 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| MI | 2026-08-26 16:16 | 2026-08-24+ | CSTL | Oelschlager Kristen M | COO | S - Sale | $34.06 | -24.6K | 72.6K | -25% | -$837.9K |
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 | 2026-08-24 | S | D | 12,218 | $33.69 | 85,033 | I The Fritz Shorter Trust | — | — | (F1) This transaction was executed in multiple trades at prices ranging from $33.500 to $33.885, 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. (F2) Held by the Fritz Shorter Trust of which the Reporting Person and her spouse are the trustees and beneficiaries. |
| 2 | Common | Common Stock | 2026-08-25 | S | D | 7,161 | $34.26 | 77,872 | I The Fritz Shorter Trust | — | — | (F3) This transaction was executed in multiple trades at prices ranging from $33.470 to $34.460, 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. (F2) Held by the Fritz Shorter Trust of which the Reporting Person and her spouse are the trustees and beneficiaries. |
| 3 | Common | Common Stock | 2026-08-25 | S | D | 5,223 | $34.64 | 72,649 | I The Fritz Shorter Trust | — | — | (F4) This transaction was executed in multiple trades at prices ranging from $34.495 to $34.750, 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. (F2) Held by the Fritz Shorter Trust of which the Reporting Person and her spouse are the trustees and beneficiaries. |