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CSTL insider trading — Castle Biosciences Inc

Over the last 90 days, insiders at Castle Biosciences Inc (CSTL) made 0 open-market purchases worth $0 and 3 open-market sales worth $1.58M, making them net sellers by $1.58M. The largest sale was by Stokes Frank (Chief Financial Officer), who sold 24,908 shares for $742K on Aug 14, 2026.

Updated Oct 16, 2026.

Insider buying · 90d
$0
Insider selling · 90d
$1.58M
Net · 90d
−$1.58M
Last 30 days
0B / 0S

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Recent CSTL insider transactions

Every Form 4 filed by Castle Biosciences Inc officers, directors and 10% owners in the last 90 days, newest first. P = open-market purchase, S = open-market sale; other codes are awards, option exercises, tax withholding or gifts.

Trade dateInsiderRoleTypeOwnershipSharesPriceValueFiling
Oct 12, 2026Juvenal Tobin WChief Commercial OfficerS · Sale · 10b5-1Direct3,288$33.64$111KForm 4
Oct 5, 2026Maetzold Derek JPres. & Chief Exec. OfficerM · Option exercise · 10b5-1Direct8,165$2.39$20KForm 4
Oct 5, 2026Maetzold Derek JPres. & Chief Exec. OfficerS · Sale · 10b5-1Direct8,580$35.57$305KForm 4
Oct 5, 2026Maetzold Derek JPres. & Chief Exec. OfficerS · Sale · 10b5-1Indirect5,916$35.57$210KForm 4
Oct 1, 2026Oelschlager Kristen MChief Operating OfficerM · Option exercise · 10b5-1Direct4,153$3.38$14KForm 4
Oct 1, 2026Oelschlager Kristen MChief Operating OfficerS · Sale · 10b5-1Direct4,153$35.95$149KForm 4
Sep 30, 2026Juvenal Tobin WChief Commercial OfficerS · Sale · 10b5-1Direct1,034$34.20$35KForm 4
Sep 29, 2026Juvenal Tobin WChief Commercial OfficerS · Sale · 10b5-1Direct5,543$35.50$197KForm 4
Sep 21, 2026Maetzold Derek JPres. & Chief Exec. OfficerM · Option exercise · 10b5-1Direct8,580$2.39$21KForm 4
Sep 21, 2026Maetzold Derek JPres. & Chief Exec. OfficerS · Sale · 10b5-1Direct8,580$35.33$303KForm 4
Sep 21, 2026Maetzold Derek JPres. & Chief Exec. OfficerS · Sale · 10b5-1Indirect5,916$35.33$209KForm 4
Sep 15, 2026Juvenal Tobin WChief Commercial OfficerS · Sale · 10b5-1Direct3,294$35.14$116KForm 4
Sep 14, 2026Juvenal Tobin WChief Commercial OfficerS · Sale · 10b5-1Direct3,306$32.32$107KForm 4
Sep 11, 2026Maetzold Derek JPres. & Chief Exec. OfficerM · Option exercise · 10b5-1Direct8,584$2.39$21KForm 4
Sep 11, 2026Maetzold Derek JPres. & Chief Exec. OfficerS · Sale · 10b5-1Direct8,584$32.02$275KForm 4
Sep 11, 2026Maetzold Derek JPres. & Chief Exec. OfficerS · Sale · 10b5-1Indirect5,934$32.02$190KForm 4
Sep 1, 2026Oelschlager Kristen MChief Operating OfficerM · Option exercise · 10b5-1Direct4,152$3.38$14KForm 4
Sep 1, 2026Oelschlager Kristen MChief Operating OfficerS · Sale · 10b5-1Direct4,152$33.39$139KForm 4
Aug 31, 2026Juvenal Tobin WChief Commercial OfficerS · Sale · 10b5-1Direct1,730$32.81$57KForm 4
Aug 28, 2026Maetzold Derek JPres. & Chief Exec. OfficerM · Option exercise · 10b5-1Direct12,428$2.39$30KForm 4
Aug 28, 2026Maetzold Derek JPres. & Chief Exec. OfficerS · Sale · 10b5-1Direct12,428$33.20$413KForm 4
Aug 28, 2026Maetzold Derek JPres. & Chief Exec. OfficerS · Sale · 10b5-1Indirect6,132$33.20$204KForm 4
Aug 25, 2026Juvenal Tobin WChief Commercial OfficerS · Sale · 10b5-1Direct9,050$35.04$317KForm 4
Aug 25, 2026Oelschlager Kristen MChief Operating OfficerS · SaleIndirect12,384$34.42$426KForm 4
Aug 24, 2026Oelschlager Kristen MChief Operating OfficerS · SaleIndirect12,218$33.69$412KForm 4
Aug 17, 2026Juvenal Tobin WChief Commercial OfficerS · Sale · 10b5-1Direct1,730$29.59$51KForm 4
Aug 14, 2026Stokes FrankChief Financial OfficerS · SaleDirect24,908$29.77$742KForm 4
Aug 14, 2026Maetzold Derek JPres. & Chief Exec. OfficerM · Option exercise · 10b5-1Direct1,100$2.39$3KForm 4
Aug 14, 2026Maetzold Derek JPres. & Chief Exec. OfficerS · Sale · 10b5-1Direct1,100$30.02$33KForm 4
Aug 14, 2026Maetzold Derek JPres. & Chief Exec. OfficerS · Sale · 10b5-1Indirect6,132$30.02$184KForm 4
Aug 5, 2026Maetzold Derek JPres. & Chief Exec. OfficerM · Option exercise · 10b5-1Direct2,546$2.39$6KForm 4
Aug 5, 2026Maetzold Derek JPres. & Chief Exec. OfficerS · Sale · 10b5-1Direct2,546$30.68$78KForm 4
Aug 5, 2026Maetzold Derek JPres. & Chief Exec. OfficerS · Sale · 10b5-1Indirect1,029$30.68$32KForm 4
Aug 4, 2026Maetzold Derek JPres. & Chief Exec. OfficerM · Option exercise · 10b5-1Direct20,356$2.39$49KForm 4
Aug 4, 2026Maetzold Derek JPres. & Chief Exec. OfficerS · Sale · 10b5-1Direct20,356$31.11$633KForm 4
Aug 4, 2026Maetzold Derek JPres. & Chief Exec. OfficerS · Sale · 10b5-1Indirect15,085$31.11$469KForm 4
Nov 24, 2025Juvenal Tobin WChief Commercial OfficerS · Sale · 10b5-1Direct1,301$38.39$50KForm 4
Aug 3, 2026Oelschlager Kristen MChief Operating OfficerS · Sale · 10b5-1Direct8,586$29.77$256KForm 4
Aug 3, 2026Juvenal Tobin WChief Commercial OfficerS · Sale · 10b5-1Direct1,730$28.25$49KForm 4
Jul 31, 2026Juvenal Tobin WChief Commercial OfficerS · Sale · 10b5-1Direct17,310$29.31$507KForm 4
Aug 3, 2026Maetzold Derek JPres. & Chief Exec. OfficerM · Option exercise · 10b5-1Direct10,664$2.39$25KForm 4
Aug 3, 2026Maetzold Derek JPres. & Chief Exec. OfficerS · Sale · 10b5-1Direct10,664$30.35$324KForm 4
Aug 3, 2026Maetzold Derek JPres. & Chief Exec. OfficerS · Sale · 10b5-1Indirect7,829$30.35$238KForm 4
Jul 31, 2026Maetzold Derek JPres. & Chief Exec. OfficerM · Option exercise · 10b5-1Direct6,480$2.39$15KForm 4
Jul 31, 2026Maetzold Derek JPres. & Chief Exec. OfficerS · Sale · 10b5-1Direct6,480$30.15$195KForm 4
Jul 31, 2026Maetzold Derek JPres. & Chief Exec. OfficerS · Sale · 10b5-1Indirect3,673$30.15$111KForm 4
Jul 27, 2026Maetzold Derek JPres. & Chief Exec. OfficerM · Option exercise · 10b5-1Direct6,214$2.39$15KForm 4
Jul 27, 2026Maetzold Derek JPres. & Chief Exec. OfficerS · Sale · 10b5-1Direct6,214$24.16$150KForm 4
Jul 27, 2026Maetzold Derek JPres. & Chief Exec. OfficerS · Sale · 10b5-1Indirect3,622$24.16$88KForm 4

CSTL insider trading FAQ

Are insiders buying CSTL stock?

Not on the open market. In the last 90 days, Castle Biosciences Inc insiders made no open-market purchases, and 3 open-market sales totaling $1.58M. Purchases with the insider's own money are generally seen as a stronger signal than sales, which happen for many reasons (taxes, diversification, planned 10b5-1 sales).

Who are the insiders trading CSTL?

Recent sellers: Oelschlager Kristen M, Stokes Frank.

Where does CSTL insider trading data come from?

Every transaction comes from SEC Form 4 filings on EDGAR. Company officers, directors and 10% owners must file a Form 4 within two business days of buying or selling. InsiderBolt reads these filings directly from the SEC.

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Insider trading data is for informational purposes only and is not investment advice. Filings can be amended; always confirm details on SEC EDGAR.