Castle Biosciences Inc.

Last updated September 27, 2026

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Organization details

Legal name: Castle Biosciences Inc.
Ownership: Public
Status: Active
Sector (GICS): Health Care
SIC code: 8071 — Services-Medical Laboratories
Jurisdiction of incorporation: Delaware
Headquarters city: Friendswood
Headquarters state / province: Texas
Headquarters country: United States
Fiscal year end: December
Ticker symbol: CSTL
Primary stock exchange: Nasdaq

Identifiers

SEC CIK: 0001447362
EIN: 77-0701774

Board of directors

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Daniel Bradbury · Director
Since 2023
Derek J. Maetzold · Director · Pres. & Chief Exec. Officer
Since 2023
Ellen Goldberg · Director
Since 2023
G. Bradley Cole · Director
Since 2023
Kim Caple · Director
Since 2023
Mara G. Aspinall · Director
Since 2023
Miles Harrison · Director
Since 2023
Rodney Cotton · Director
Since 2024
Tiffany Olson · Director
Since 2023

Director election results

Annual meeting of May 28, 2026. Support is votes for as a share of votes for and against (or withheld). Below 80% is a clear protest.

Board connections

4 of this board's directors also sit on 5 other boards. 5 are in the same sector.

Shared director Other board Same sector

Equillium Inc. Same sector
via Daniel Bradbury
Kiniksa Pharmaceuticals International plc Same sector
via G. Bradley Cole
MiMedx Group Inc Same sector
via Tiffany Olson
OraSure Technologies Inc. Same sector
via Mara G. Aspinall
Vivani Medical Inc. Same sector
via Daniel Bradbury

Insider trades

All notable trades →

From SEC Forms 4 and 5. Open-market purchases and sales are highlighted; grants, option exercises and shares withheld for tax are routine.

Bought, last 12 months: $0; 0 purchases by 0 insiders
Sold, last 12 months: $18,710,043; 217 sales by 5 insiders

Date	Insider	Transaction	Shares	Price	Value
Nov 2, 2026	Derek J. Maetzold Director, Officer (Pres. & Chief Exec. Officer)	Open-market sale	−7,555	$36.01	$272,018
Nov 2, 2026	Derek J. Maetzold Director, Officer (Pres. & Chief Exec. Officer)	Open-market sale	−2,816	$36.01	$101,390
Nov 2, 2026	Derek J. Maetzold Director, Officer (Pres. & Chief Exec. Officer)	Open-market sale	−2,393	$36.01	$86,160
Nov 2, 2026	Derek J. Maetzold Director, Officer (Pres. & Chief Exec. Officer)	Open-market sale	−1,025	$36.81	$37,734
Nov 2, 2026	Derek J. Maetzold Director, Officer (Pres. & Chief Exec. Officer)	Open-market sale	−382	$36.81	$14,063
Nov 2, 2026	Derek J. Maetzold Director, Officer (Pres. & Chief Exec. Officer)	Open-market sale	−325	$36.81	$11,965
Oct 28, 2026	Juvenal Tobin W Officer (Chief Commercial Officer)	Open-market sale	−1,237	$35.58	$44,009
Oct 28, 2026	Juvenal Tobin W Officer (Chief Commercial Officer)	Open-market sale	−5,341	$36.62	$195,582
Oct 26, 2026	Juvenal Tobin W Officer (Chief Commercial Officer)	Open-market sale	−3,288	$33.08	$108,767
Oct 19, 2026	Derek J. Maetzold Director, Officer (Pres. & Chief Exec. Officer)	Open-market sale	−8,580	$31.91	$273,788
Oct 19, 2026	Derek J. Maetzold Director, Officer (Pres. & Chief Exec. Officer)	Open-market sale	−3,198	$31.91	$102,048
Oct 19, 2026	Derek J. Maetzold Director, Officer (Pres. & Chief Exec. Officer)	Open-market sale	−2,718	$31.91	$86,731
Oct 5, 2026	Derek J. Maetzold Director, Officer (Pres. & Chief Exec. Officer)	Option exercise	+8,165	$2.39	$19,514
Oct 5, 2026	Derek J. Maetzold Director, Officer (Pres. & Chief Exec. Officer)	Open-market sale	−8,580	$35.57	$305,156
Oct 5, 2026	Derek J. Maetzold Director, Officer (Pres. & Chief Exec. Officer)	Open-market sale	−3,198	$35.57	$113,740

Peers

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Questions about Castle Biosciences Inc.

How many directors are on Castle Biosciences Inc.'s board?

Castle Biosciences Inc.'s board has 9 directors: Daniel Bradbury, Derek J. Maetzold, Ellen Goldberg, G. Bradley Cole, Kim Caple, Mara G. Aspinall, Miles Harrison, Rodney Cotton and Tiffany Olson.

Are Castle Biosciences Inc. insiders buying or selling shares?

Over the last 12 months, Castle Biosciences Inc. insiders made no open-market purchases and sold $18.7 million of shares in 217 sales on the open market, as reported to the SEC on Forms 4 and 5.

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