SEC Form 4 · accession 0001628280-26-060430
CASTLE BIOSCIENCES INC · CSTL
Statement of changes in beneficial ownership, as filed. Original on EDGAR ↗
Reporting owner
Kristen M Oelschlager
Officer — Chief Operating Officer
Period of report
Sep 1, 2026
Accepted (ET)
Sep 3, 2026 · 4:07 pm EDT
Rule 10b5-1 plan
yes — trade under a plan
Issuer CIK
0001447362
Table I — non-derivative securities
| Security | Date | Code | Shares | Price | A/D | Owned after | D/I | Nature of ownership |
|---|---|---|---|---|---|---|---|---|
| Common StockF2 | Sep 1, 2026 | M | 4,152 | $3.38 | A | 17,508 | D | |
| Common StockF3 | Sep 1, 2026 | S | 3,952 | $33.36 | D | 13,556 | D | |
| Common Stock | Sep 1, 2026 | S | 200 | $34.02 | D | 13,356 | D | |
| Common StockF4 | holding | — | — | — | 72,649 | I | The Fritz Shorter Trust |
Table II — derivative securities
| Security | Conv. / exercise price | Date | Code | Shares | A/D | Exercisable | Expires | Underlying | Underlying shares | Owned after | D/I |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Stock option (right to buy)F5 | $3.38 | Sep 1, 2026 | M | 4,152 | D | — | Mar 12, 2029 | Common Stock | 4,152 | 12,458 | D |
Explanation of responses
- F1These transactions were made pursuant to a Rule 10b5-1 plan adopted by the Reporting Person, on March 17, 2026.
- F2Includes 68 shares acquired on August 31, 2026, under the Issuer's employee stock purchase plan.
- F3This transaction was executed in multiple trades at prices ranging from $33.015 to $33.900, 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.
- F4Held by the Fritz Shorter Trust of which the Reporting Person and her spouse are the trustees and beneficiaries.
- F5The shares subject to the option are fully vested.