Castle Biosciences, Inc. (CSTL) Insider Trading

Last 12 months

Insiders sold $19.4M and bought nothing on the open market.

84% of the selling was scheduled in advance under 10b5-1 plans. Chief Operating Officer Kristen M Oelschlager sold $838k on Aug 25, 22% of their stake, outside a plan. The last open-market buy by an executive or director was in Jun 2023.

Net open-market

−$19.4M

0 buys · 60 sales

Under a 10b5-1 plan

84%

of the value sold

Insiders who bought / sold

0 / 5

executives and directors

Last open-market buy

Jun 2023

Jun 5, 2023

Get an email when CSTL's executives or directors buy, or make a large sale outside a plan.

Trades · last 2 years

Date	Insider	Trade	Shares	Price	Value	Of their stake	Filing
Oct 19	Derek J Maetzold Pres. & Chief Exec. Officer	Sold10b5-1 plan 3 parts	14,496	$31.91 average	$463k	7.8%	Form 4
Oct 12	Tobin W Juvenal Chief Commercial Officer	Sold10b5-1 plan	3,288	$33.64	$111k	6.3%	Form 4
Oct 5	Derek J Maetzold Pres. & Chief Exec. Officer	Sold10b5-1 plan 3 parts	14,496	$35.57 average	$516k	7.3%	Form 4
Oct 1	Kristen M Oelschlager Chief Operating Officer	Sold10b5-1 plan 2 parts	4,153	$35.95 average	$149k	4.6%	Form 4
Sep 29 – 30	Tobin W Juvenal Chief Commercial Officer	Sold10b5-1 plan 2 parts	6,577	$35.29 average	$232k	11%	Form 4
Sep 21	Derek J Maetzold Pres. & Chief Exec. Officer	Sold10b5-1 plan 3 parts	14,496	$35.33 average	$512k	7.5%	Form 4
Sep 14 – 15	Tobin W Juvenal Chief Commercial Officer	Sold10b5-1 plan 2 parts	6,600	$33.73 average	$223k	10%	Form 4
Sep 11	Derek J Maetzold Pres. & Chief Exec. Officer	Sold10b5-1 plan 6 parts	14,518	$32.02 average	$465k	6.5%	Form 4
Sep 1	Kristen M Oelschlager Chief Operating Officer	Sold10b5-1 plan 2 parts	4,152	$33.39 average	$139k	4.6%	Form 4
Aug 31	Tobin W Juvenal Chief Commercial Officer	Sold10b5-1 plan	1,730	$32.81	$57k	2.6%	Form 4
Aug 28	Derek J Maetzold Pres. & Chief Exec. Officer	Sold10b5-1 plan 14 parts	18,560	$33.20 average	$616k	7.7%	Form 4
Aug 25	Tobin W Juvenal Chief Commercial Officer	Sold10b5-1 plan	9,050	$35.04	$317k	12%	Form 4
Aug 24 – 25	Kristen M Oelschlager Chief Operating Officer	SoldNo plan 3 parts	24,602	$34.06 average	$838k	22%	Form 4
Aug 17	Tobin W Juvenal Chief Commercial Officer	Sold10b5-1 plan	1,730	$29.59	$51k	2.2%	Form 4
Aug 14	Frank Stokes Chief Financial Officer	SoldNo plan	24,908	$29.77	$742k	41%	Form 4
Aug 14	Derek J Maetzold Pres. & Chief Exec. Officer	Sold10b5-1 plan 7 parts	7,232	$30.02 average	$217k	3.5%	Form 4
Aug 4 – 5	Derek J Maetzold Pres. & Chief Exec. Officer	Sold10b5-1 plan 9 parts	39,016	$31.07 average	$1.21M	14%	Form 4
Aug 3	Kristen M Oelschlager Chief Operating Officer	Sold10b5-1 plan 3 parts	8,586	$29.77 average	$256k	7.2%	Form 4
Jul 31 – Aug 3	Tobin W Juvenal Chief Commercial Officer	Sold10b5-1 plan 4 parts	19,040	$29.21 average	$556k	19%	Form 4
Jul 31 – Aug 3	Derek J Maetzold Pres. & Chief Exec. Officer	Sold10b5-1 plan 6 parts	28,646	$30.28 average	$867k	9.7%	Form 4
Jul 27	Derek J Maetzold Pres. & Chief Exec. Officer	Sold10b5-1 plan 14 parts	9,836	$24.16 average	$238k	3.4%	Form 4
Jul 14	Derek J Maetzold Pres. & Chief Exec. Officer	Sold10b5-1 plan 7 parts	4,172	$22.92 average	$96k	1.7%	Form 4
Jul 1	Derek J Maetzold Pres. & Chief Exec. Officer	Sold10b5-1 plan 7 parts	9,836	$24.29 average	$239k	4.0%	Form 4
Jul 1	Kristen M Oelschlager Chief Operating Officer	Sold10b5-1 plan 2 parts	8,586	$24.42 average	$210k	6.7%	Form 4
Jun 16	Kristen M Oelschlager Chief Operating Officer	Sold10b5-1 plan	8,587	$20.71	$178k	6.3%	Form 4
Jun 15	Derek J Maetzold Pres. & Chief Exec. Officer	Sold10b5-1 plan 7 parts	4,172	$20.66 average	$86k	1.7%	Form 4
Jun 1	Derek J Maetzold Pres. & Chief Exec. Officer	Sold10b5-1 plan 7 parts	9,836	$20.86 average	$205k	3.7%	Form 4
May 20 – 21	Derek J Maetzold Pres. & Chief Exec. Officer	Sold10b5-1 plan 14 parts	4,172	$20.15 average	$84k	1.2%	Form 4
May 7	Derek J Maetzold Pres. & Chief Exec. Officer	Sold10b5-1 plan 14 parts	9,836	$22.15 average	$218k	3.1%	Form 4
Apr 21	Derek J Maetzold Pres. & Chief Exec. Officer	Sold10b5-1 plan 7 parts	4,172	$25.10 average	$105k	1.5%	Form 4
Apr 6	Derek J Maetzold Pres. & Chief Exec. Officer	Sold10b5-1 plan 7 parts	9,836	$25.03 average	$246k	3.5%	Form 4
Mar 26	Derek J Maetzold Pres. & Chief Exec. Officer	Sold10b5-1 plan 7 parts	4,172	$25.55 average	$107k	1.5%	Form 4
Mar 17 – 18	Derek J Maetzold Pres. & Chief Exec. Officer	Sold10b5-1 plan 2 parts	19,300	$25.91 average	$500k	6.5%	Form 4
Mar 13 – 16	Derek J Maetzold Pres. & Chief Exec. Officer	Sold10b5-1 plan 3 parts	30,779	$25.74 average	$792k	9.3%	Form 4
Mar 12	Tobin W Juvenal Chief Commercial Officer	Sold10b5-1 plan	20,863	$25.24	$527k	19%	Form 4
Mar 11 – 12	Derek J Maetzold Pres. & Chief Exec. Officer	Sold10b5-1 plan 8 parts	44,125	$25.67 average	$1.13M	12%	Form 4
Mar 5	Frank Stokes Chief Financial Officer	Sold10b5-1 plan	6,001	$27.98	$168k	9.1%	Form 4
Mar 5	G Bradley Cole Director	SoldNo plan 2 parts	7,403	$28.47 average	$211k	28%	Form 4
Mar 3	Frank Stokes Chief Financial Officer	Sold10b5-1 plan 2 parts	7,000	$27.44 average	$192k	9.6%	Form 4
Feb 3 – 4	Derek J Maetzold Pres. & Chief Exec. Officer	Sold10b5-1 plan 3 parts	4,017	$39.52 average	$159k	1.2%	Form 4

Oct 1910b5-1 plan
Derek J Maetzold
Pres. & Chief Exec. Officer · sold 14,496 at avg $31.91
$463k
7.8% of stake
Oct 1210b5-1 plan
Tobin W Juvenal
Chief Commercial Officer · sold 3,288 at $33.64
$111k
6.3% of stake
Oct 510b5-1 plan
Derek J Maetzold
Pres. & Chief Exec. Officer · sold 14,496 at avg $35.57
$516k
7.3% of stake
Oct 110b5-1 plan
Kristen M Oelschlager
Chief Operating Officer · sold 4,153 at avg $35.95
$149k
4.6% of stake
Sep 29 – 3010b5-1 plan
Tobin W Juvenal
Chief Commercial Officer · sold 6,577 at avg $35.29
$232k
11% of stake
Sep 2110b5-1 plan
Derek J Maetzold
Pres. & Chief Exec. Officer · sold 14,496 at avg $35.33
$512k
7.5% of stake
Sep 14 – 1510b5-1 plan
Tobin W Juvenal
Chief Commercial Officer · sold 6,600 at avg $33.73
$223k
10% of stake
Sep 1110b5-1 plan
Derek J Maetzold
Pres. & Chief Exec. Officer · sold 14,518 at avg $32.02
$465k
6.5% of stake
Sep 110b5-1 plan
Kristen M Oelschlager
Chief Operating Officer · sold 4,152 at avg $33.39
$139k
4.6% of stake
Aug 3110b5-1 plan
Tobin W Juvenal
Chief Commercial Officer · sold 1,730 at $32.81
$57k
2.6% of stake
Aug 2810b5-1 plan
Derek J Maetzold
Pres. & Chief Exec. Officer · sold 18,560 at avg $33.20
$616k
7.7% of stake
Aug 2510b5-1 plan
Tobin W Juvenal
Chief Commercial Officer · sold 9,050 at $35.04
$317k
12% of stake
Aug 24 – 25No plan
Kristen M Oelschlager
Chief Operating Officer · sold 24,602 at avg $34.06
$838k
22% of stake
Aug 1710b5-1 plan
Tobin W Juvenal
Chief Commercial Officer · sold 1,730 at $29.59
$51k
2.2% of stake
Aug 14No plan
Frank Stokes
Chief Financial Officer · sold 24,908 at $29.77
$742k
41% of stake
Aug 1410b5-1 plan
Derek J Maetzold
Pres. & Chief Exec. Officer · sold 7,232 at avg $30.02
$217k
3.5% of stake
Aug 4 – 510b5-1 plan
Derek J Maetzold
Pres. & Chief Exec. Officer · sold 39,016 at avg $31.07
$1.21M
14% of stake
Aug 310b5-1 plan
Kristen M Oelschlager
Chief Operating Officer · sold 8,586 at avg $29.77
$256k
7.2% of stake
Jul 31 – Aug 310b5-1 plan
Tobin W Juvenal
Chief Commercial Officer · sold 19,040 at avg $29.21
$556k
19% of stake
Jul 31 – Aug 310b5-1 plan
Derek J Maetzold
Pres. & Chief Exec. Officer · sold 28,646 at avg $30.28
$867k
9.7% of stake
Jul 2710b5-1 plan
Derek J Maetzold
Pres. & Chief Exec. Officer · sold 9,836 at avg $24.16
$238k
3.4% of stake
Jul 1410b5-1 plan
Derek J Maetzold
Pres. & Chief Exec. Officer · sold 4,172 at avg $22.92
$96k
1.7% of stake
Jul 110b5-1 plan
Derek J Maetzold
Pres. & Chief Exec. Officer · sold 9,836 at avg $24.29
$239k
4.0% of stake
Jul 110b5-1 plan
Kristen M Oelschlager
Chief Operating Officer · sold 8,586 at avg $24.42
$210k
6.7% of stake
Jun 1610b5-1 plan
Kristen M Oelschlager
Chief Operating Officer · sold 8,587 at $20.71
$178k
6.3% of stake
Jun 1510b5-1 plan
Derek J Maetzold
Pres. & Chief Exec. Officer · sold 4,172 at avg $20.66
$86k
1.7% of stake
Jun 110b5-1 plan
Derek J Maetzold
Pres. & Chief Exec. Officer · sold 9,836 at avg $20.86
$205k
3.7% of stake
May 20 – 2110b5-1 plan
Derek J Maetzold
Pres. & Chief Exec. Officer · sold 4,172 at avg $20.15
$84k
1.2% of stake
May 710b5-1 plan
Derek J Maetzold
Pres. & Chief Exec. Officer · sold 9,836 at avg $22.15
$218k
3.1% of stake
Apr 2110b5-1 plan
Derek J Maetzold
Pres. & Chief Exec. Officer · sold 4,172 at avg $25.10
$105k
1.5% of stake
Apr 610b5-1 plan
Derek J Maetzold
Pres. & Chief Exec. Officer · sold 9,836 at avg $25.03
$246k
3.5% of stake
Mar 2610b5-1 plan
Derek J Maetzold
Pres. & Chief Exec. Officer · sold 4,172 at avg $25.55
$107k
1.5% of stake
Mar 17 – 1810b5-1 plan
Derek J Maetzold
Pres. & Chief Exec. Officer · sold 19,300 at avg $25.91
$500k
6.5% of stake
Mar 13 – 1610b5-1 plan
Derek J Maetzold
Pres. & Chief Exec. Officer · sold 30,779 at avg $25.74
$792k
9.3% of stake
Mar 1210b5-1 plan
Tobin W Juvenal
Chief Commercial Officer · sold 20,863 at $25.24
$527k
19% of stake
Mar 11 – 1210b5-1 plan
Derek J Maetzold
Pres. & Chief Exec. Officer · sold 44,125 at avg $25.67
$1.13M
12% of stake
Mar 510b5-1 plan
Frank Stokes
Chief Financial Officer · sold 6,001 at $27.98
$168k
9.1% of stake
Mar 5No plan
G Bradley Cole
Director · sold 7,403 at avg $28.47
$211k
28% of stake
Mar 310b5-1 plan
Frank Stokes
Chief Financial Officer · sold 7,000 at avg $27.44
$192k
9.6% of stake
Feb 3 – 410b5-1 plan
Derek J Maetzold
Pres. & Chief Exec. Officer · sold 4,017 at avg $39.52
$159k
1.2% of stake

How to read this. Insiders sell for many reasons: taxes, diversifying, a house. Open-market buys are rarer and say more. A 10b5-1 plan is a trading schedule set up months in advance, so those sales were not timed on news. Large holders (funds and 10% owners) are listed under Everything but not counted as insiders. If you own or watch CSTL, we send a push when an executive buys or makes a large sale outside a plan.

Source: SEC Form 4 filings, filed within two business days of each trade and checked for new ones every hour.

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Spot a number that looks wrong? Check it in CSTL's SEC filings or

Download this analysis as a PDF (Pro)

Data sourced from SEC EDGAR filings and third-party price providers. Scores, valuations, and metrics are algorithmic estimates. This is not investment advice. See our Terms and Methodology.

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