Form 4 for CSTL CASTLE BIOSCIENCES INC
Accepted 2026-08-05 16:18:21 ET · period of report 2026-08-03 · accession 0001628280-26-053391 · 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| MT | 2026-08-05 16:18 | 2026-08-03 | CSTL | Oelschlager Kristen M | COO | S - Sale | $29.77 | -8,586 | 13.3K | -39% | -$255.6K |
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 | 2026-08-03 | S | D | 3,000 | $29.12 | 18,874 | D | — | — | (F1) These transactions were made pursuant to a Rule 10b5-1 plan adopted by the Reporting Person, on March 17, 2026. (F2) This transaction was executed in multiple trades at prices ranging from $28.46 to $29.45, 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. |
| 2 | Common | Common Stock | 2026-08-03 | S | D | 4,486 | $30.00 | 14,388 | D | — | — | (F1) These transactions were made pursuant to a Rule 10b5-1 plan adopted by the Reporting Person, on March 17, 2026. (F3) This transaction was executed in multiple trades at prices ranging from $29.53 to $30.44, 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. |
| 3 | Common | Common Stock | 2026-08-03 | S | D | 1,100 | $30.62 | 13,288 | D | — | — | (F1) These transactions were made pursuant to a Rule 10b5-1 plan adopted by the Reporting Person, on March 17, 2026. (F4) This transaction was executed in multiple trades at prices ranging from $30.55 to $30.71, 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. |