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Data sources

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

RH CHAIN…
OverviewFollow the MoneyDaily BriefLiveCongressDirectoryCorporate InsidersGovernment MoneyPolitical InfluenceInstitutionsWashington NetworkFollow the PowerDisclosure ClockAI InvestigatorWatchlistConvergenceINSIDER AlphaSignal ledgerHistorical ReplayRobinhood ChainProofTradingTokenProAccountMethodology
01Overview02Follow the Money03Daily Brief04Live05Congress06Directory07Corporate Insiders08Government Money09Political Influence10Institutions11Washington Network12Follow the Power13Disclosure Clock14AI Investigator15Watchlist
ConvergenceINSIDER AlphaSignal ledgerHistorical ReplayRobinhood ChainProofTradingTokenProAccountMethodology
OverviewFollow the MoneyDaily BriefLiveCongressDirectoryCorporate InsidersGovernment MoneyPolitical InfluenceInstitutionsWashington NetworkFollow the PowerDisclosure ClockAI InvestigatorWatchlistConvergenceINSIDER AlphaSignal ledgerHistorical ReplayRobinhood ChainProofTradingTokenProAccountMethodology
Data sources
SEC FORM 42h ago
HOUSE PTR2h ago
SEC 13F2h ago
ROBINHOOD CHAIN2h ago
Corporate insider
MJ

Maetzold Derek J

Director, Pres. & Chief Exec. OfficerCIK 0001239501

EDGAR filingsOpen in network
Disclosed transactions23
Buys / sells0 / 19
Max Insider Score21
Connections1with evidence

Disclosed transactions

ScoreActorSecuritySideValueExecutedDisclosedLagSourceEvidence
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

Verified connections

  • Insider ofevidence
    CASTLE BIOSCIENCES INCDirector, Pres. & Chief Exec. Officer · Nov 6, 2025
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, 2026
Nov 4, 2026
traded Nov 2, 2026
+2d
SEC FORM 4

Evidence

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

18
MJ
Maetzold Derek JDirector, Pres. & Chief Exec. Officer
CSTLCASTLE BIOSCIENCES INC
Open-market sale · 10b5-1 plan
SELL$101K
2,816 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

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$102K
3,198 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

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

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

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$97K
2,718 sh
Oct 5, 2026Oct 7, 2026
traded Oct 5, 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

12
MJ
Maetzold Derek JDirector, Pres. & Chief Exec. Officer
CSTLCASTLE BIOSCIENCES INC
Open-market sale · 10b5-1 plan
SELL$113K
3,198 sh
Sep 21, 2026Sep 23, 2026
traded Sep 21, 2026
+2dSEC FORM 4

Evidence

12
MJ
Maetzold Derek JDirector, Pres. & Chief Exec. Officer
CSTLCASTLE BIOSCIENCES INC
Open-market sale · 10b5-1 plan
SELL$96K
2,718 sh
Sep 21, 2026Sep 23, 2026
traded Sep 21, 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

4
MJ
Maetzold Derek JDirector, Pres. & Chief Exec. Officer
CSTLCASTLE BIOSCIENCES INC
Open-market sale · 10b5-1 plan
SELL$161K
4,017 sh
Jan 20, 2026Jan 22, 2026
traded Jan 20, 2026
+2dSEC FORM 4

Evidence

4
MJ
Maetzold Derek JDirector, Pres. & Chief Exec. Officer
CSTLCASTLE BIOSCIENCES INC
Open-market sale · 10b5-1 plan
SELL$85K
2,678 sh
Nov 5, 2025Nov 6, 2025
traded Nov 5, 2025
+1dSEC FORM 4

Evidence

5
MJ
Maetzold Derek JDirector, Pres. & Chief Exec. Officer
CSTLCASTLE BIOSCIENCES INC
Open-market sale · 10b5-1 plan
SELL$7,375
237 sh
Nov 4, 2025Nov 6, 2025
traded Nov 4, 2025
+2dSEC FORM 4

Evidence

12
MJ
Maetzold Derek JDirector, Pres. & Chief Exec. Officer
CSTLCASTLE BIOSCIENCES INC
Open-market sale · 10b5-1 plan
SELL$196K
6,458 sh
Nov 4, 2025Nov 6, 2025
traded Nov 4, 2025
+2dSEC FORM 4

Evidence