STOCK TITAN
  1. Home
  2. Sec-filings
  3. CSTL
  4. [Form 4] CASTLE BIOSCIENCES INC Insider Trading Activity

Castle Biosciences (CSTL) COO sells 24,602 shares in trust

Filing Impact
(Very High)
Filing Sentiment
(Negative)
Form Type
4

Rhea-AI Filing Summary

CASTLE BIOSCIENCES INC (CSTL) reported that Chief Operating Officer Kristen M. Oelschlager had associated entities sell a total of 24,602 shares of common stock on August 24–25, 2026. The shares were sold indirectly through The Fritz Shorter Trust at weighted-average prices between approximately $33.50 and $34.75. Oelschlager also reports a direct holding of 13,288 shares of common stock after these transactions.

Positive

  • None.

Negative

  • None.

Insights

Analyzing...

Insider Oelschlager Kristen M
Role Chief Operating Officer
Sold 24,602 shs ($838K)
Type Security Shares Price Value
Sale Common Stock F3, F2 7,161 $34.263 $245K
Sale Common Stock F4, F2 5,223 $34.639 $181K
Sale Common Stock F1, F2 12,218 $33.687 $412K
holding Common Stock -- -- --
Holdings After Transaction: Common Stock — 72,649 shares (Indirect, The Fritz Shorter Trust); Common Stock — 13,288 shares (Direct)
Footnotes (4)
  1. 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.
  2. F2. Held by the Fritz Shorter Trust of which the Reporting Person and her spouse are the trustees and beneficiaries.
  3. 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.
  4. 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.
Total shares sold 24,602 shares Aggregate insider sales by The Fritz Shorter Trust on August 24–25, 2026
Shares sold on 2026-08-24 12,218 shares Indirect sale via The Fritz Shorter Trust at a weighted-average price of $33.687
Shares sold on 2026-08-25 (first block) 7,161 shares Indirect sale via The Fritz Shorter Trust at a weighted-average price of $34.263
Shares sold on 2026-08-25 (second block) 5,223 shares Indirect sale via The Fritz Shorter Trust at a weighted-average price of $34.639
Price range for 2026-08-24 trades $33.500–$33.885 Range of individual trade prices; $33.687 reported as weighted-average sale price
Price range for 2026-08-25 trades (7,161 shares) $33.470–$34.460 Range of individual trade prices; $34.263 reported as weighted-average sale price
Price range for 2026-08-25 trades (5,223 shares) $34.495–$34.750 Range of individual trade prices; $34.639 reported as weighted-average sale price
Direct holdings after transactions 13,288 shares Directly held CSTL common stock reported as of August 24, 2026
indirect financial
"These sales are reported as indirect through The Fritz Shorter Trust"
weighted-average sale price financial
"The price reported above reflects the weighted-average sale price"
beneficiaries financial
"The Reporting Person and her spouse are the trustees and beneficiaries"
Beneficiaries are the people or organizations designated to receive benefits, such as money or assets, from a financial arrangement like a trust, insurance policy, or retirement plan. They matter to investors because choosing the right beneficiaries ensures that assets are passed on according to their wishes, providing financial security or support to loved ones when needed. Think of beneficiaries as the intended recipients of a gift or inheritance.
open market or private transaction financial
"Transaction code S indicates a sale in open market or private transaction"
Rule 10b5-1 regulatory
"The Rule 10b5-1 checkbox is not marked for these transactions"
Rule 10b5-1 is a regulation that allows company insiders to buy or sell their shares at predetermined times, even if they have access to non-public information. It acts like setting a schedule in advance for transactions, helping prevent accusations of unfair trading. This rule provides a way for insiders to plan trades transparently, giving investors confidence that these transactions are not based on hidden information.

FAQ

What insider transactions did CSTL report for Kristen M. Oelschlager?
CSTL reported that Chief Operating Officer Kristen M. Oelschlager had entities associated with her sell 24,602 shares of common stock on August 24–25, 2026, through The Fritz Shorter Trust, at weighted-average sale prices between about $33.50 and $34.75.

How many CSTL shares were sold on August 24, 2026?
On August 24, 2026, The Fritz Shorter Trust sold 12,218 shares of CSTL common stock at a weighted-average price of $33.687 per share, with individual trades executed between $33.500 and $33.885.

What CSTL share sales occurred on August 25, 2026?
On August 25, 2026, The Fritz Shorter Trust sold 7,161 shares at a weighted-average price of $34.263 and 5,223 shares at $34.639. The related trades were executed in price ranges of $33.470–$34.460 and $34.495–$34.750, respectively.

Are the CSTL shares sold held directly by Kristen M. Oelschlager?
No. The 24,602 shares sold are held by The Fritz Shorter Trust, for which Kristen M. Oelschlager and her spouse are trustees and beneficiaries. These are reported as indirect holdings. She also reports a direct holding of 13,288 shares after the reported transactions.

Were the CSTL insider sales made under a Rule 10b5-1 trading plan?
The filing indicates the Rule 10b5-1 checkbox as not checked, and the footnotes do not state that the transactions were made pursuant to a trading plan. The sales are described as open market or private transactions with weighted-average sale prices.

What position does Kristen M. Oelschlager hold at CSTL?
Kristen M. Oelschlager is reported as the Chief Operating Officer of CASTLE BIOSCIENCES INC (CSTL) and is the reporting person for the Form 4 insider transactions associated with The Fritz Shorter Trust and her direct shareholdings.

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

See more from StockTitan in Google Search and AI answers. Adds StockTitan as a preferred source · opens Google
Add on Google
Form 4 Insider Transactions: What Each Field Means →
SEC Form 4
FORM 4UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940
OMB APPROVAL
OMB Number:3235-0287
Estimated average burden
hours per response:0.5
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.
1. Name and Address of Reporting Person*
Oelschlager Kristen M
(Last)(First)(Middle)
C/O CASTLE BIOSCIENCES, INC.
1500 W. PARKWOOD AVE SUITE 400
(Street)
FRIENDSWOOD TEXAS 77546
(City)(State)(Zip)
UNITED STATES
(Country)		2. Issuer Name and Ticker or Trading Symbol
CASTLE BIOSCIENCES INC [ CSTL ] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
Director10% Owner
XOfficer (give title below)Other (specify below)
Chief Operating Officer
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
08/24/2026		6. Individual or Joint/Group Filing (Check Applicable Line)
XForm filed by One Reporting Person
Form filed by More than One Reporting Person
4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year)2A. Deemed Execution Date, if any (Month/Day/Year)3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
CodeVAmount(A) or (D)Price
Common Stock08/24/2026S12,218D$33.687(1)85,033IThe Fritz Shorter Trust(2)
Common Stock08/25/2026S7,161D$34.263(3)77,872IThe Fritz Shorter Trust(2)
Common Stock08/25/2026S5,223D$34.639(4)72,649IThe Fritz Shorter Trust(2)
Common Stock13,288D
Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year)3A. Deemed Execution Date, if any (Month/Day/Year)4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 6. Date Exercisable and Expiration Date (Month/Day/Year)7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Explanation of Responses:
1. 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.
2. Held by the Fritz Shorter Trust of which the Reporting Person and her spouse are the trustees and beneficiaries.
3. 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.
4. 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.
Remarks:
/s/ Frank Stokes, Attorney-in-fact08/26/2026
** Signature of Reporting PersonDate
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)

Source: View Original Filing on SEC EDGAR