Kristen M. Oelschlager - 12 Jan 2026 Form 4 Insider Report for CASTLE BIOSCIENCES INC (CSTL)

Reporting relationship: Chief Operating Officer
Issuer ticker: CSTL
Reported as of: 12 Jan 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 14 Jan 2026, 16:30:09 UTC
Prior SEC filing: 19 Dec 2025
Next SEC filing: 05 Mar 2026
Source filing: View source filing
Reporting owner signature: /s/ Frank Stokes, Attorney-in-Fact

Key filing fact

Kristen M. Oelschlager filed Form 4 for CASTLE BIOSCIENCES INC (CSTL) on 14 Jan 2026.

Key facts

This page summarizes Kristen M. Oelschlager's Form 4 filing for CASTLE BIOSCIENCES INC (CSTL).
2 reported transactions and 1 derivative row are listed below.
Accepted by SEC: 14 Jan 2026, 16:30.

Change

Previous filing in this sequence was filed on 19 Dec 2025.
Current net transaction value: $0.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001856565 Primary reporting owner

Oelschlager Kristen M

Relationship: Chief Operating Officer
Address: C/O CASTLE BIOSCIENCES, INC., 505 S FRIENDSWOOD DRIVE, SUITE 401, FRIENDSWOOD
Signature: /s/ Frank Stokes, Attorney-in-Fact
Signature date: 14 Jan 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

CSTL transaction

Common Stock

Award

Transaction value: $0
Shares: +9,207
Change %: +75%
Price: $0.000000
Shares after: 21,530
Date: 12 Jan 2026
Ownership: Direct
Footnotes: F1

CSTL holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 97,251
Date: 12 Jan 2026
Ownership: The Fritz Shorter Trust
Footnotes: F2

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

CSTL transaction Derivative

Performance-Based Stock Unit

Award

Transaction value: $0
Shares: +9,207
Change %
Price: $0.000000
Shares after: 9,207
Date: 12 Jan 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 9,207
Exercise price
Footnotes: F3

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 3 footnotes

Footnote F1

Represents 50% of the Performance-Based Stock Units ("PSUs") granted on March 4, 2024 ("2024 PSUs") that vested based on the satisfaction of certain performance criteria as certified by the board of directors of the Issuer on January 12, 2026.

Footnote F2

Held by the Fritz Shorter Trust of which the Reporting Person and her spouse are the trustees and beneficiaries.

Footnote F3

Each PSU represents the right to receive one share of the Issuer's Common Stock. These PSUs represent the remaining 50% of the 2024 PSUs which will vest subject to the achievement of certain milestones.