1 unchanged sentence
Insider Trading Arrangements
−Removed: On March 9, 2026 , Frank Stokes , our Chief Financial Officer , adopted a Rule 10b5-1 trading arrangement providing for the sale from time to time of an aggregate of up to 29,421 shares of our common stock.
+Added: On May 28, 2026 , Tobin Juvenal , our Chief Commercial Officer , adopted a Rule 10b5-1 trading arrangement providing for the sale from time to time of an aggregate of up to 85,524 shares of our common stock and up to 100% of the shares of our common stock issued upon the settlement of 63,029 shares of RSUs and PSUs, less the number of shares withheld to cover tax withholding obligations in connection with the vesting and settlement of such RSUs and PSUs.
The trading arrangement is intended to satisfy the affirmative defense in Rule 10b5-1(c).
−Removed: The duration of the trading arrangement is estimated to be from June 8, 2026 until the earlier of all transaction under the trading arrangement being completed or June 30, 2026 .
−Removed: No other officers or directors, as defined in Rule 16a-1(f), adopted and/or terminated a Rule 10b5-1 trading arrangement or a non-Rule 10b5-1 trading arrangement, as defined in Regulation S-K Item 408, for the three months ended March 31, 2026.
+Added: The duration of the trading arrangement is estimated to be from September 14, 2026 until the earlier of all transaction under the trading arrangement being completed or March 19, 2027 .
+Added: On June 2, 2026 , Derek J.
+Added: Maetzold , our Chief Executive Officer , adopted a Rule 10b5-1 trading arrangement providing for the sale from time to time of an aggregate of up to 202,966 shares of our common stock and up to 100% of the shares of our common stock issued upon the settlement of 180,459 shares of RSUs and PSUs, less the number of shares withheld to cover tax withholding obligations in connection with the vesting and settlement of such RSUs and PSUs.
+Added: The trading arrangement is intended to satisfy the affirmative defense in Rule 10b5-1(c).
+Added: The duration of the trading arrangement is estimated to be from September 11, 2026 until the earlier of all transaction under the trading arrangement being completed or March 19, 2027 .
+Added: No other directors or officers, as defined in Rule 16a-1(f), adopted and/or terminated a Rule 10b5-1 trading arrangement or a non-Rule 10b5-1 trading arrangement, as defined in Regulation S-K Item 408, for the three months ended June 30, 2026.
Exhibit Number Description
3 unchanged sentences
333-232369), as amended, originally filed with the SEC on June 26, 2019.
−Removed: First Amendment to Office Lease Agreement, dated March 5, 2026, by and between the Registrant and Perimeter Gateway Portfolio LLC.
−Removed: Lease Agreement, dated March 19, 2026, by and between the Registrant and Faros ACA RE LLC.
−Removed: Second Amendment to Lease Agreement, dated March 19, 2026, by and between the Registrant and ACA Concourse East Unit 3 LLC.
+Added: Non-Employee Director Compensation Policy, as amended effective May 28, 2026.
31.1* Certification of Principal Executive Officer pursuant to Rules 13a-14(a) and 15d-14(a) of the Exchange Act.
11 unchanged sentences
** Furnished herewith
−Removed: † Certain schedules or exhibits have been omitted pursuant to Item 601(a)(5) of Regulation S-K.
−Removed: A copy of any omitted schedule or exhibit will be furnished to the SEC upon request;
−Removed: provided, however, that we may request confidential treatment pursuant to Rule 24b-2 of the Exchange Act for any schedule or exhibit so furnished.
+Added: Indicates management contract or compensatory plan
Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.
CASTLE BIOSCIENCES, INC.
−Removed: May 6, 2026 By:
+Added: July 30, 2026 By:
President and Chief Executive Officer
(Principal Executive Officer)
−Removed: May 6, 2026 By:
+Added: July 30, 2026 By:
/s/ Frank Stokes
2 unchanged sentences
Compared sentence by sentence after normalising whitespace, quotation marks, case and digits, so re-formatting and restated figures do not read as changed language. Wording changes appear as one removal and one addition. The current filing and the prior one are authoritative.