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Public disclosures only. Scores flag unusual patterns and are not evidence of wrongdoing. Not investment advice.

RH CHAIN…
OverviewFollow the MoneyDaily BriefLiveCongressCorporate InsidersGovernment MoneyPolitical InfluenceInstitutionsWashington NetworkFollow the PowerDisclosure ClockAI InvestigatorWatchlistConvergenceINSIDER AlphaSignal ledgerHistorical ReplayRobinhood ChainProofTradingTokenProAccountMethodologyMatch reviewLaunch readiness
01Overview02Follow the Money03Daily Brief04Live05Congress06Corporate Insiders07Government Money08Political Influence09Institutions10Washington Network11Follow the Power12Disclosure Clock13AI Investigator14Watchlist
ConvergenceINSIDER AlphaSignal ledgerHistorical ReplayRobinhood ChainProofTradingTokenProAccountMethodologyMatch reviewLaunch readiness
OverviewFollow the MoneyDaily BriefLiveCongressCorporate InsidersGovernment MoneyPolitical InfluenceInstitutionsWashington NetworkFollow the PowerDisclosure ClockAI InvestigatorWatchlistConvergenceINSIDER AlphaSignal ledgerHistorical ReplayRobinhood ChainProofTradingTokenProAccountMethodologyMatch reviewLaunch readiness
Data sources
SEC FORM 453m ago
HOUSE PTR52m ago
SEC 13F52m ago
ROBINHOOD CHAIN52m ago
SEC FORM 4/Open-market saleVerified dataRule 10b5-1 plan

Maetzold Derek J sold CSTL

Director, Pres. & Chief Exec. Officer · CASTLE BIOSCIENCES INC · Common Stock

Side
SELL
Value
$101K
Shares
2,816
Price
$36.01
Executed
Nov 2, 2026
Disclosed
Nov 4, 2026
Disclosure timeline2 days from execution to publication · legal deadline 2 business days
Nov 2 executedNov 4, 2026 disclosed

CSTL · daily

Yahoo Finance chart API
▲Execution▼Disclosure●Material company filing●Other disclosed buy●Other disclosed sellUnofficial public endpoint; daily OHLCV, split-adjusted. Replace with a licensed feed for production.

Insider Score

Experimental signal
18/ 100 · ROUTINE
Methodology →
  • Transaction type+6 / 20

    Open-market sale

  • Relative size+16 / 25

    $101K reported value · 58.2% of prior position

  • Filing timing0 / 15

    Disclosed 2 business days after execution (deadline: 2)

  • Historical behavior+1 / 15

    Routine: 13 prior trades recorded in this security

  • Frequency & clustering+5 / 15

    1 other actor traded the same direction within 14 days

  • Market events0 / 10

    No material company filing within 60 days after the trade

  • Pre-arranged plan-10

    Executed under a Rule 10b5-1 trading plan

    • The Insider Score measures how far a disclosure deviates from normal filing patterns. A high score is a prompt for research, not evidence of illegal insider trading.

    Other disclosed activity · CSTL

    ScoreActorSecuritySideValueExecutedDisclosedLagSourceEvidence
    7
    MJ
    Maetzold Derek JDirector, Pres. & Chief Exec. Officer
    CSTLCASTLE BIOSCIENCES INC
    Open-market sale · 10b5-1 plan
    		SELL$12K
    325 sh
    		Nov 2, 2026Nov 4, 2026
    traded Nov 2, 2026
    		+2dSEC FORM 4

    Evidence

    7
    MJ
    Maetzold Derek JDirector, Pres. & Chief Exec. Officer
    CSTLCASTLE BIOSCIENCES INC
    Open-market sale · 10b5-1 plan
    		SELL$14K
    382 sh
    		Nov 2, 2026Nov 4, 2026
    traded Nov 2, 2026
    		+2dSEC FORM 4

    Evidence

    18
    MJ
    Maetzold Derek JDirector, Pres. & Chief Exec. Officer
    CSTLCASTLE BIOSCIENCES INC
    Open-market sale · 10b5-1 plan
    		SELL$86K
    2,393 sh
    		Nov 2, 2026Nov 4, 2026
    traded Nov 2, 2026
    		+2dSEC FORM 4

    Evidence

    21
    MJ
    Maetzold Derek JDirector, Pres. & Chief Exec. Officer
    CSTLCASTLE BIOSCIENCES INC
    Open-market sale · 10b5-1 plan
    		SELL$272K
    7,555 sh
    		Nov 2, 2026Nov 4, 2026
    traded Nov 2, 2026
    		+2dSEC FORM 4

    Evidence

    11
    MJ
    Maetzold Derek JDirector, Pres. & Chief Exec. Officer
    CSTLCASTLE BIOSCIENCES INC
    Open-market sale · 10b5-1 plan
    		SELL$38K
    1,025 sh
    		Nov 2, 2026Nov 4, 2026
    traded Nov 2, 2026
    		+2dSEC FORM 4

    Evidence

    13
    JW
    Juvenal Tobin WChief Commercial Officer
    CSTLCASTLE BIOSCIENCES INC
    Open-market sale · 10b5-1 plan
    		SELL$196K
    5,341 sh
    		Oct 28, 2026Oct 30, 2026
    traded Oct 28, 2026
    		+2dSEC FORM 4

    Evidence

    6
    JW
    Juvenal Tobin WChief Commercial Officer
    CSTLCASTLE BIOSCIENCES INC
    Open-market sale · 10b5-1 plan
    		SELL$44K
    1,237 sh
    		Oct 28, 2026Oct 30, 2026
    traded Oct 28, 2026
    		+2dSEC FORM 4

    Evidence

    13
    JW
    Juvenal Tobin WChief Commercial Officer
    CSTLCASTLE BIOSCIENCES INC
    Open-market sale · 10b5-1 plan
    		SELL$109K
    3,288 sh
    		Oct 26, 2026Oct 28, 2026
    traded Oct 26, 2026
    		+2dSEC FORM 4

    Evidence

    17
    MJ
    Maetzold Derek JDirector, Pres. & Chief Exec. Officer
    CSTLCASTLE BIOSCIENCES INC
    Open-market sale · 10b5-1 plan
    		SELL$274K
    8,580 sh
    		Oct 19, 2026Oct 21, 2026
    traded Oct 19, 2026
    		+2dSEC FORM 4

    Evidence

    14
    MJ
    Maetzold Derek JDirector, Pres. & Chief Exec. Officer
    CSTLCASTLE BIOSCIENCES INC
    Open-market sale · 10b5-1 plan
    		SELL$87K
    2,718 sh
    		Oct 19, 2026Oct 21, 2026
    traded Oct 19, 2026
    		+2dSEC FORM 4

    Evidence

    14
    MJ
    Maetzold Derek JDirector, Pres. & Chief Exec. Officer
    CSTLCASTLE BIOSCIENCES INC
    Open-market sale · 10b5-1 plan
    		SELL$102K
    3,198 sh
    		Oct 19, 2026Oct 21, 2026
    traded Oct 19, 2026
    		+2dSEC FORM 4

    Evidence

    17
    JW
    Juvenal Tobin WChief Commercial Officer
    CSTLCASTLE BIOSCIENCES INC
    Open-market sale · 10b5-1 plan
    		SELL$111K
    3,288 sh
    		Oct 12, 2026Oct 14, 2026
    traded Oct 12, 2026
    		+2dSEC FORM 4

    Evidence

    0
    MJ
    Maetzold Derek JDirector, Pres. & Chief Exec. Officer
    CSTLCASTLE BIOSCIENCES INC
    Option exercise · 10b5-1 plan
    		M—
    8,165 sh
    		Oct 5, 2026Oct 7, 2026
    traded Oct 5, 2026
    		+2dSEC FORM 4

    Evidence

    0
    MJ
    Maetzold Derek JDirector, Pres. & Chief Exec. Officer
    CSTLCASTLE BIOSCIENCES INC
    Option exercise · 10b5-1 plan
    		M$20K
    8,165 sh
    		Oct 5, 2026Oct 7, 2026
    traded Oct 5, 2026
    		+2dSEC FORM 4

    Evidence

    17
    MJ
    Maetzold Derek JDirector, Pres. & Chief Exec. Officer
    CSTLCASTLE BIOSCIENCES INC
    Open-market sale · 10b5-1 plan
    		SELL$305K
    8,580 sh
    		Oct 5, 2026Oct 7, 2026
    traded Oct 5, 2026
    		+2dSEC FORM 4

    Evidence

    14
    MJ
    Maetzold Derek JDirector, Pres. & Chief Exec. Officer
    CSTLCASTLE BIOSCIENCES INC
    Open-market sale · 10b5-1 plan
    		SELL$114K
    3,198 sh
    		Oct 5, 2026Oct 7, 2026
    traded Oct 5, 2026
    		+2dSEC FORM 4

    Evidence

    14
    MJ
    Maetzold Derek JDirector, Pres. & Chief Exec. Officer
    CSTLCASTLE BIOSCIENCES INC
    Open-market sale · 10b5-1 plan
    		SELL$97K
    2,718 sh
    		Oct 5, 2026Oct 7, 2026
    traded Oct 5, 2026
    		+2dSEC FORM 4

    Evidence

    0
    MJ
    Maetzold Derek JDirector, Pres. & Chief Exec. Officer
    CSTLCASTLE BIOSCIENCES INC
    Option exercise · 10b5-1 plan
    		M—
    8,580 sh
    		Sep 21, 2026Sep 23, 2026
    traded Sep 21, 2026
    		+2dSEC FORM 4

    Evidence

    3
    MJ
    Maetzold Derek JDirector, Pres. & Chief Exec. Officer
    CSTLCASTLE BIOSCIENCES INC
    Option exercise · 10b5-1 plan
    		M$21K
    8,580 sh
    		Sep 21, 2026Sep 23, 2026
    traded Sep 21, 2026
    		+2dSEC FORM 4

    Evidence

    15
    MJ
    Maetzold Derek JDirector, Pres. & Chief Exec. Officer
    CSTLCASTLE BIOSCIENCES INC
    Open-market sale · 10b5-1 plan
    		SELL$303K
    8,580 sh
    		Sep 21, 2026Sep 23, 2026
    traded Sep 21, 2026
    		+2dSEC FORM 4

    Evidence

    Evidence

    Verified data

    Read directly from the primary public document; every field below is as reported by the filer.

    Source

    Document
    SEC Form 4
    Publisher
    U.S. Securities and Exchange Commission (EDGAR)
    Document ID
    0001628280-26-070131
    Machine-readable
    Structured copy

    Timestamps

    Event (reported)
    Nov 2, 2026
    Published
    Nov 4, 2026
    Ingested by INSIDER
    Nov 4, 22:39 UTC
    Last re-read
    Nov 5, 15:28 UTC

    Extracted facts

    Filer
    Maetzold Derek J
    Role
    Director, Pres. & Chief Exec. Officer
    Transaction
    Open-market saleAs filed: “S”
    Asset
    CASTLE BIOSCIENCES INC
    Ticker
    CSTL
    Shares
    2,816
    Price per share
    $36.01
    Value
    $101,390
    Execution date (reported)
    Nov 2, 2026
    Owned after transaction
    2,024 shares
    Rule 10b5-1 plan
    Yes, as checked by the filer
    Days from execution to publication
    2

    Calculation

    Value = shares × reported price per share

    • Shares: 2,816
    • Price: $36.005

    = $101,390

    What this establishes

    Maetzold Derek J filed this Form 4 reporting a open-market sale of CSTL on Nov 2, 2026. It became public on Nov 4, 2026. The filing establishes the reported transaction and the filer's stated role. It does not establish why the trade was made or what the filer knew.

    Extraction

    Method
    Form 4 XML
    Confidence
    1.00
    Director, Pres. & Chief Exec. Officer
    Maetzold Derek Jcik:0001239501
    Issuer
    CASTLE BIOSCIENCES INCcik:0001447362

    Revision history · 0

    No field has changed since this record was first ingested.

    Company events

    No records

    No material filings recorded for this issuer.