Transaction · 0001628280-26-005794

MAETZOLD DEREK J

MAETZOLD DEREK J, PRES, CEO, reported an open-market or private sale at CASTLE BIOSCIENCES INC involving 171.000000 shares for an estimated $6602.31. Reported holdings after the transaction were 83698.000000 shares. The stored filing text includes a detected 10b5-1 reference.

Open-market sellSEC transaction code SPRES, CEO
CSTLCASTLE BIOSCIENCES INC
Filing timeFeb 05
Trade dateFeb 04, 2026
Filing · SECView on SEC
InsiderProfile

Price performance since filing

Close on the filing date, the pre-filing context, and the forward return at standard windows
Price at filing
$32.40
Pre-filing
1mo ago +20.4%1w ago +21.9%1d ago +20.2%
Returns since
7d -1.5%30d -16.3%90d -23.6%180d -3.8%1y +3.4%

CSTL price since this filing

30 days of pre-filing context and vertical markers at the filing date plus 7d / 30d / 90d / 180d / 1y afterwards
CSTL since 2026-02-05Filed 210 days ago · 30 days of pre-filing context shaded
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Filing datePost-filing windows (7d, 30d, 90d, 180d, 1y)30 days of pre-filing context

Transaction facts

Stored Form 4 columns with their raw values

Non-derivative
Type
Sell
Code S
Identifier
0001628280-26-005794
Common Stock
Transaction date
Feb 04, 2026
Filed Feb 05, 2026, 09:17 PM · 1d delay
Shares
171 sh
$3.86k per share
Estimated value
-$660k
Computed from shares × price
Holdings after
83.6k sh
Direct

Filing signal explanations

Badges describe filing facts only — not predictions.

Cluster 14dRepeat 30dPattern $10.0MLarge $100M
Direct Ownership Repeat Seller 10b5-1 Detected
0score
Filing-only score

0

Compact filing score computed from stored Form 4 facts. Version v1.

Neutral filing signal

This filing is broadly neutral on the filing-only scale. The Form 4 facts do not strongly tilt positive or negative.

Reported relationships & other filings

Form 4 relationship flags and nearby filing context

Reported roles

Pres. & Chief Exec. Officer

Officer YesDirector Yes10% NoOther No
Footnotes & amended
  1. F1

    These transactions were made pursuant to a Rule 10b5-1 plan adopted by the Reporting Person on May 8, 2025.

  2. F2

    This transaction was executed in multiple trades at prices ranging from $39.590 to $40.360, inclusive. The price reported above reflects the weighted-average sale price. The Reporting Person hereby un…

  3. F3

    This transaction was executed in multiple trades at prices ranging from $37.490 to $38.080, inclusive. The price reported above reflects the weighted-average sale price. The Reporting Person hereby un…

  4. F4

    This transaction was executed in multiple trades at prices ranging from $38.520 to $38.885, inclusive. The price reported above reflects the weighted-average sale price. The Reporting Person hereby un…

  5. F5

    Held by The Maetzold Descendants 2020 Trust of which the Reporting Person's spouse is the trustee and the Reporting Person's spouse and their children are beneficiaries.

  6. F6

    Held by Derek Maetzold 2020 Irrevocable Trust of which the Reporting Person is the trustee and his children are beneficiaries.

  7. F7

    Held by The Maetzold 2018 Remainder Trust FBO Emily Carol Kirk of which the Reporting Person is the trustee and his child is the beneficiary.

  8. F8

    Held by The Maetzold 2018 Remainder Trust FBO Hannah Elizabeth Maetzold of which the Reporting Person is the trustee and his child is the beneficiary.

  9. F9

    Held by The Maetzold 2018 Remainder Trust FBO John Derek Maetzold of which the Reporting Person is the trustee and his child is the beneficiary.

  10. F10

    Held by The Maetzold 2018 Remainder Trust FBO Peter Douglas Maetzold of which the Reporting Person is the trustee and his child is the beneficiary.

  11. F11

    Held by DJM Grantor Retained Annuity Trust No. 5 of which the Reporting Person is the trustee and beneficiary.

  12. F12

    Held by DJM Grantor Retained Annuity Trust No. 6 of which the Reporting Person is the trustee and the beneficiaries are The Maetzold 2018 Remainder Trust FBO John Derek Maetzold, The Maetzold 2018

  13. Remainder Trust FBO Emily Carol Kirk, The Maetzold 2018 Remainder Trust FBO Peter Douglas Maetzold and The Maetzold 2018 Remainder Trust FBO Hannah Elizabeth Maetzold.

  14. F13

    Held by DJM Grantor Retained Annuity Trust No. 7 of which the Reporting Person is the trustee and beneficiary.

Original filing · 0001628280-26-005794
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