Transaction · 0001628280-26-001161

MAETZOLD DEREK J

MAETZOLD DEREK J, PRES, CEO, reported an open-market or private sale at CASTLE BIOSCIENCES INC involving 2678.000000 shares for an estimated $102005.02. Reported holdings after the transaction were 30852.000000 shares. The stored filing text includes a detected 10b5-1 reference.

Open-market sellSEC transaction code SPRES, CEO
CSTLCASTLE BIOSCIENCES INC
Filing timeJan 07
Trade dateJan 05, 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
Pre-filing
Returns since

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 2026-01-07Filed 239 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
0001628280-26-001161
Common Stock
Transaction date
Jan 05, 2026
Filed Jan 07, 2026, 09:06 PM · 2d delay
Shares
2.67k sh
$3.80k per share
Estimated value
-$10.2M
Computed from shares × price
Holdings after
30.8k sh
Direct

Filing signal explanations

Badges describe filing facts only — not predictions.

Cluster 14dRepeat 30dPattern $10.0MLarge $100M
Direct Ownership Large Sale 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 $37.970 to $38.450, 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 $40.000 to $40.255, inclusive. The price reported above reflects the weighted-average sale price. The Reporting Person hereby un…

  4. F4

    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.

  5. F5

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

  6. F6

    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.

  7. F7

    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.

  8. F8

    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.

  9. F9

    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.

  10. F10

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

  11. F11

    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

  12. 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.

  13. F12

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

Original filing · 0001628280-26-001161
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