CSTL Castle Biosciences, Inc.

NASDAQ
$32.33

Castle Biosciences, Inc. (CSTL) Insider Activity

What the officers, directors and large holders did with their own shares. Only open-market purchases and sales count toward the totals — grants, option exercises and shares withheld for tax are compensation mechanics, not decisions, and they're listed separately below.

30D 90D 6M 1Y
Insider signal In line Selling ran in line with CSTL's own trailing one-year pace, with 82% of sale value under a prearranged plan.
Cluster activity 0 buyers in the last 30 days 0 buyers in the last 90 days 4 sellers in the last 90 days
Insiders buying
0
0 transactions
Insiders selling
5
197 transactions
Purchases
$0
0 shares
Sales
$16.7M
557,954 shares
Net activity
-$16.7M
purchases less sales

How much of that selling was preplanned? 82% planned / 18% discretionary

10b5-1 plan sales $13.7M 188 transactions · 468,457 shares
Discretionary sales $3.0M 9 transactions · 89,497 shares

Largest single sale: $741.5K.

Where they traded

Buy Sell Dot area is proportional to transaction value.

No open-market insider purchase on record.

Recent open-market activity

Date Insider Role Action Shares Price Value Held after
Juvenal Tobin W Chief Commercial Officer Sell 10b5-1 1,730 $32.81 $56.8K 65,184 −2.6% of holding
MAETZOLD DEREK J 14 fills Pres. & Chief Exec. Officer Sell 10b5-1 18,560 $33.20 $616.1K 22,435 −45.3% of holding
Oelschlager Kristen M 2 fills Chief Operating Officer Sell 12,384 $34.42 $426.3K 77,872 −13.7% of holding
Juvenal Tobin W Chief Commercial Officer Sell 10b5-1 9,050 $35.04 $317.1K 66,914 −11.9% of holding
Oelschlager Kristen M Chief Operating Officer Sell 12,218 $33.69 $411.6K 85,033 −12.6% of holding
Juvenal Tobin W Chief Commercial Officer Sell 10b5-1 1,730 $29.59 $51.2K 75,964 −2.2% of holding
Stokes Frank Chief Financial Officer Sell 24,908 $29.77 $741.5K 35,177 −41.5% of holding
MAETZOLD DEREK J 7 fills Pres. & Chief Exec. Officer Sell 10b5-1 7,232 $30.02 $217.1K 21,479 −25.2% of holding
MAETZOLD DEREK J 3 fills Pres. & Chief Exec. Officer Sell 10b5-1 3,575 $30.68 $109.7K 23,069 −13.4% of holding
MAETZOLD DEREK J 6 fills Pres. & Chief Exec. Officer Sell 10b5-1 35,441 $31.11 $1.1M 33,414 −51.5% of holding
MAETZOLD DEREK J 3 fills Pres. & Chief Exec. Officer Sell 10b5-1 18,493 $30.35 $561.3K 31,781 −36.8% of holding
Oelschlager Kristen M 3 fills Chief Operating Officer Sell 10b5-1 8,586 $29.77 $255.6K 18,874 −31.3% of holding
Juvenal Tobin W Chief Commercial Officer Sell 10b5-1 1,730 $28.25 $48.9K 78,995 −2.1% of holding
Juvenal Tobin W 3 fills Chief Commercial Officer Sell 10b5-1 17,310 $29.31 $507.3K 89,886 −16.1% of holding
MAETZOLD DEREK J 3 fills Pres. & Chief Exec. Officer Sell 10b5-1 10,153 $30.15 $306.1K 36,013 −22% of holding
MAETZOLD DEREK J 14 fills Pres. & Chief Exec. Officer Sell 10b5-1 9,836 $24.16 $237.7K 38,046 −20.5% of holding
MAETZOLD DEREK J 7 fills Pres. & Chief Exec. Officer Sell 10b5-1 4,172 $22.92 $95.6K 39,353 −9.6% of holding
MAETZOLD DEREK J 7 fills Pres. & Chief Exec. Officer Sell 10b5-1 9,836 $24.29 $238.9K 40,710 −19.5% of holding
Oelschlager Kristen M 2 fills Chief Operating Officer Sell 10b5-1 8,586 $24.42 $209.7K 22,274 −27.8% of holding
Oelschlager Kristen M Chief Operating Officer Sell 10b5-1 8,587 $20.71 $177.8K 30,460 −22% of holding
MAETZOLD DEREK J 7 fills Pres. & Chief Exec. Officer Sell 10b5-1 4,172 $20.66 $86.2K 42,067 −9% of holding
MAETZOLD DEREK J 7 fills Pres. & Chief Exec. Officer Sell 10b5-1 9,836 $20.86 $205.1K 43,424 −18.5% of holding
MAETZOLD DEREK J 7 fills Pres. & Chief Exec. Officer Sell 10b5-1 3,183 $20.20 $64.3K 44,781 −6.6% of holding
MAETZOLD DEREK J 7 fills Pres. & Chief Exec. Officer Sell 10b5-1 989 $20.00 $19.8K 45,816 −2.1% of holding
MAETZOLD DEREK J 14 fills Pres. & Chief Exec. Officer Sell 10b5-1 9,836 $22.15 $217.9K 46,336 −17.5% of holding
MAETZOLD DEREK J 7 fills Pres. & Chief Exec. Officer Sell 10b5-1 4,172 $25.10 $104.7K 47,495 −8.1% of holding
MAETZOLD DEREK J 7 fills Pres. & Chief Exec. Officer Sell 10b5-1 9,836 $25.03 $246.2K 48,852 −16.8% of holding
MAETZOLD DEREK J 7 fills Pres. & Chief Exec. Officer Sell 10b5-1 4,172 $25.55 $106.6K 50,209 −7.7% of holding
MAETZOLD DEREK J Pres. & Chief Exec. Officer Sell 10b5-1 650 $25.39 $16.5K 21,479 −2.9% of holding
MAETZOLD DEREK J Pres. & Chief Exec. Officer Sell 10b5-1 18,650 $25.93 $483.6K 22,129 −45.7% of holding
MAETZOLD DEREK J 2 fills Pres. & Chief Exec. Officer Sell 10b5-1 17,575 $25.97 $456.4K 40,905 −30.1% of holding
MAETZOLD DEREK J Pres. & Chief Exec. Officer Sell 10b5-1 13,204 $25.45 $336.0K 58,354 −18.5% of holding
MAETZOLD DEREK J Pres. & Chief Exec. Officer Sell 10b5-1 23,179 $25.28 $585.9K 71,558 −24.5% of holding
Juvenal Tobin W Chief Commercial Officer Sell 10b5-1 20,863 $25.24 $526.6K 86,825 −19.4% of holding
MAETZOLD DEREK J 7 fills Pres. & Chief Exec. Officer Sell 10b5-1 20,946 $26.11 $546.9K 94,737 −18.1% of holding
Cole G Bradley 2 fills Director Sell 7,403 $28.47 $210.7K 21,964 −25.2% of holding
Stokes Frank Chief Financial Officer Sell 10b5-1 6,001 $27.98 $167.9K 60,085 −9.1% of holding
Stokes Frank 2 fills Chief Financial Officer Sell 10b5-1 7,000 $27.44 $192.1K 54,183 −11.4% of holding
MAETZOLD DEREK J 2 fills Pres. & Chief Exec. Officer Sell 10b5-1 817 $37.99 $31.0K 83,869 −1% of holding
MAETZOLD DEREK J Pres. & Chief Exec. Officer Sell 10b5-1 3,200 $39.91 $127.7K 84,515 −3.6% of holding
MAETZOLD DEREK J Pres. & Chief Exec. Officer Sell 10b5-1 4,017 $40.01 $160.7K 87,715 −4.4% of holding
MAETZOLD DEREK J Pres. & Chief Exec. Officer Sell 10b5-1 1,339 $40.10 $53.7K 29,513 −4.3% of holding
MAETZOLD DEREK J Pres. & Chief Exec. Officer Sell 10b5-1 2,678 $38.09 $102.0K 30,852 −8% of holding
MAETZOLD DEREK J Pres. & Chief Exec. Officer Sell 10b5-1 830 $40.35 $33.5K 33,530 −2.4% of holding
Oelschlager Kristen M Chief Operating Officer Sell 14,888 $39.31 $585.3K 12,323 −54.7% of holding
MAETZOLD DEREK J Pres. & Chief Exec. Officer Sell 10b5-1 509 $40.04 $20.4K 34,360 −1.5% of holding
MAETZOLD DEREK J Pres. & Chief Exec. Officer Sell 10b5-1 12,821 $38.55 $494.3K 34,869 −26.9% of holding
MAETZOLD DEREK J 2 fills Pres. & Chief Exec. Officer Sell 10b5-1 19,525 $38.78 $757.1K 48,702 −28.6% of holding
Juvenal Tobin W Chief Commercial Officer Sell 13,200 $37.48 $494.7K 86,825 −13.2% of holding
Stokes Frank Chief Financial Officer Sell 4,496 $37.45 $168.4K 50,326 −8.2% of holding
MAETZOLD DEREK J Pres. & Chief Exec. Officer Sell 10b5-1 1,339 $40.03 $53.6K 37,547 −3.4% of holding
MAETZOLD DEREK J Pres. & Chief Exec. Officer Sell 10b5-1 2,678 $39.23 $105.1K 38,886 −6.4% of holding
MAETZOLD DEREK J Pres. & Chief Exec. Officer Sell 10b5-1 4,258 $40.09 $170.7K 41,564 −9.3% of holding
MAETZOLD DEREK J Pres. & Chief Exec. Officer Sell 10b5-1 5,115 $40.05 $204.9K 45,822 −10% of holding
Juvenal Tobin W Chief Commercial Officer Sell 10b5-1 1,301 $38.39 $49.9K 77,694 −1.6% of holding
Juvenal Tobin W Chief Commercial Officer Sell 10b5-1 4,693 $35.58 $167.0K 84,595 −5.3% of holding
MAETZOLD DEREK J Pres. & Chief Exec. Officer Sell 10b5-1 2,678 $34.02 $91.1K 50,937 −5% of holding
Juvenal Tobin W 2 fills Chief Commercial Officer Sell 10b5-1 400 $35.40 $14.2K 84,527 −0.5% of holding
Oelschlager Kristen M Chief Operating Officer Sell 10b5-1 18,932 $35.10 $664.5K 12,323 −60.6% of holding
Stokes Frank Chief Financial Officer Sell 10b5-1 5,388 $35.08 $189.0K 43,328 −11.1% of holding
Juvenal Tobin W 2 fills Chief Commercial Officer Sell 10b5-1 1,000 $35.39 $35.4K 84,527 −1.2% of holding
MAETZOLD DEREK J Pres. & Chief Exec. Officer Sell 10b5-1 2,678 $31.85 $85.3K 53,615 −4.8% of holding
MAETZOLD DEREK J 2 fills Pres. & Chief Exec. Officer Sell 10b5-1 6,695 $30.44 $203.8K 56,530 −10.6% of holding
Oelschlager Kristen M Chief Operating Officer Sell 10b5-1 12,678 $25.04 $317.5K 27,569 −31.5% of holding
MAETZOLD DEREK J Pres. & Chief Exec. Officer Sell 10b5-1 1,339 $22.44 $30.0K 62,988 −2.1% of holding
MAETZOLD DEREK J Pres. & Chief Exec. Officer Sell 10b5-1 1,339 $22.58 $30.2K 64,327 −2% of holding
MAETZOLD DEREK J Pres. & Chief Exec. Officer Sell 10b5-1 1,339 $21.97 $29.4K 65,666 −2% of holding

Form 4s are due within two business days of a transaction, so this is close to real time — unlike the quarterly 13F data on the Institutional tab. A single large sale often reflects a prearranged 10b5-1 plan rather than a fresh view, so read a pattern of sales rather than any one of them.