Castle Biosciences officer plans $841K share sale

CASTLE BIOSCIENCES INC (CSTL) received a Rule 144 notice indicating a proposed sale of common stock for the account of officer Kristen M. Oelschlager, with J.P.

Rhea-AI Filing Summary

CASTLE BIOSCIENCES INC (CSTL) received a Rule 144 notice indicating a proposed sale of common stock for the account of officer Kristen M. Oelschlager, with J.P. Morgan Securities LLC acting as agent and attorney-in-fact. The filing covers a proposed sale of 24,602 shares of common stock, with an indicated aggregate market value of $841,388.40. The notice states that the shares are held by The Fritz Shorter Trust, with Kristen and Michael Oelschlager as trustees, and were associated with an account retitled into the trust name on March 19, 2025. The issuer reports 30,549,507 shares of common stock outstanding as of the filing context.

Key Figures

Shares proposed to be sold: 24,602 shares of common stock Aggregate market value: $841,388.40 Shares outstanding: 30,549,507 shares +2 more

5 metrics

Shares proposed to be sold 24,602 shares of common stock Number of shares covered by the Rule 144 notice

Aggregate market value $841,388.40 Aggregate market value of the 24,602 shares proposed to be sold

Shares outstanding 30,549,507 shares Common stock outstanding for CASTLE BIOSCIENCES INC as reported in the notice

Shares associated with retitled account 96,322 shares Shares linked to the account retitled into trust name on March 19, 2025

Date of Notice 08/24/2026 Date the Rule 144 notice was signed by J.P. Morgan Securities LLC

Key Terms

Rule 144, aggregate market value, attorney-in-fact, trustees

4 terms

Rule 144 regulatory

"See the definition of "person" in paragraph (a) of Rule 144."

Rule 144 is a U.S. securities regulation that sets conditions under which restricted or insider-held shares can be legally resold to the public, such as required holding periods, availability of public information, limits on how much can be sold at once, and certain filing requirements. For investors it matters because it determines when previously locked-up shares can enter the market — like a release valve that can increase supply, affect share price, and signal insider intent.

aggregate market value financial

"Common Stock | ... | 24602 | 841388.4 | 30549507 | 08/24/2026"

Aggregate market value is the combined price you would pay to buy all outstanding shares of a company or all companies in a group at current market prices — essentially the sum of each stock’s market capitalization. It matters to investors because it shows the overall size and weight of an investment or sector (like the total cost to buy every piece of a puzzle), helps compare scale across companies or markets, and influences index composition and risk exposure.

attorney-in-fact regulatory

"J.P. Morgan Securities LLC as agent and attorney-in-fact for Kristen M. Oelschlager."

An attorney-in-fact is the person or entity given legal authority through a power of attorney to act on behalf of another for specific tasks, such as signing documents, voting shares, or handling transactions. For investors, this matters because it lets a trusted representative make timely decisions or complete paperwork when the owner cannot, much like handing keys to someone to run errands on your behalf—so checks on scope and limits of that authority are important.

trustees financial

"The shares represented on this filing are being sold by The Fritz Shorter Trust, Kristen & Michael Oelschlager, trustees"

Trustees are people or a small group legally appointed to hold and manage assets, documents, or obligations on behalf of others and must act in those beneficiaries’ best interests. Think of them as a neutral guardian or custodian who enforces rules, protects assets, and makes decisions that can affect payments, corporate governance, or recovery in a default — all of which directly influence investor returns and risk.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What does the Form 144 filing disclose for CSTL?

It discloses that an affiliate of CASTLE BIOSCIENCES INC (CSTL), officer Kristen M. Oelschlager, has filed a Rule 144 notice for a proposed sale of 24,602 shares of common stock, with J.P. Morgan Securities LLC acting as agent and attorney-in-fact.

How many CSTL shares are proposed to be sold under this Form 144?

The notice covers a proposed sale of 24,602 shares of CASTLE BIOSCIENCES INC common stock, with an indicated aggregate market value of $841,388.40 based on the information in the filing.

Who is the beneficial holder related to this CSTL Form 144 filing?

The filing is for the account of Kristen M. Oelschlager, an officer, and the remarks state the shares are being sold by The Fritz Shorter Trust, with Kristen and Michael Oelschlager serving as trustees.

Which broker is handling the proposed CSTL Rule 144 sale?

The proposed sale is to be handled through J.P. Morgan Securities LLC, which signs the notice as agent and attorney-in-fact for Kristen M. Oelschlager.

How many CSTL shares are reported as outstanding in this filing?

The issuer reports 30,549,507 shares of CASTLE BIOSCIENCES INC common stock outstanding in connection with this Form 144 notice, providing context for the size of the proposed sale.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 08/24/2026 - 04:48 PM EDT Accepted by SEC EDGAR 08/24/2026 - 04:47 PM EDT Learn about SEC filing dates

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK	0001856565
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	Castle Biosciences, Inc.
SEC File Number	001-38984
Address of Issuer	505 S. Friendswood Drive, Suite 401 Friendswood TEXAS 77546
Phone	866-788-9007
Name of Person for Whose Account the Securities are To Be Sold	Kristen M. Oelschlager
See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.
Relationship to Issuer	Officer

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common Stock	J.P. Morgan Securities LLC 270 Park Avenue, 10th Floor New York NY 10017	24602	841388.4	30549507	08/24/2026	NASDAQ

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common Stock	03/19/2025	Retitled existing joint account into trust name	Kristen Oelschlager & Michael Oelschlager, who acquired from Issuer on May 8, 2009			96322	03/19/2025	N/A

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Nothing to Report

144: Remarks and Signature

Remarks	The shares represented on this filing are being sold by The Fritz Shorter Trust, Kristen & Michael Oelschlager, trustees
Date of Notice	08/24/2026
ATTENTION:
The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.
Signature	/s/ J.P. Morgan Securities LLC as agent and attorney-in-fact for Kristen M. Oelschlager.
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)