United States

Castle Biosciences Inc (CSTL)

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Castle Biosciences Inc. has seen significant insider selling activity, with 77 transactions totaling over $7 million in the last 90 days. Key executives, including the CEO and COO, have executed planned sales following the company's recent positive earnings report. The stock has experienced a 53.3% price increase over the same period.
Ticker: CSTL Exchange: NMS
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• Purchase • Sale • Planned purchase • Planned sale Net purchase Net sale Buy signal Sell signal Earnings
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Insider trades have triggered activity signals for Castle Biosciences Inc. Upgrade to see score, net flow, insiders and the full signal context.

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Top insiders
Trades
Planned sale 5 Aug 2026
Value US$2,370,135.72 | Price 157.64 | Shares 68,973 (+17.9%)
Planned sale 5 Aug 2026
Value US$2,283,072.80 | Price 90.30 | Shares 46,379 (-31.0%)
Planned sale 5 Aug 2026
Value US$100,000.00 | Price 30.68 | Shares 1,000 (-10.6%)
Abbreviations B: Buy, S: Sell, PP: Planned purchase, PlS: Planned sale, PrS: Proposed sale, O: Option / Other
Notification date Transaction date B/S Transaction type Insider and/or position Nb. shares
Price
Value 		Number of shares Price Value Details
2026-08-06 2026-08-05 PlS Planned sale
3.9
MAETZOLD DEREK J

Pres. & Chief Exec. Officer

Executive Director
68,973 +17.9%
157.64
US$2,370,136 		68,973 +17.9% 157.64 US$2,370,136
2026-08-06 2026-08-05 PlS Planned sale
3.9
MAETZOLD DEREK J

Pres. & Chief Exec. Officer

Executive Director
46,379 -31.0%
90.30
US$2,283,073 		46,379 -31.0% 90.30 US$2,283,073
2026-08-06 2026-08-05 PlS Planned sale
3.9
MAETZOLD DEREK J

Pres. & Chief Exec. Officer

Executive Director
95,679 +22.6%
263.71
US$3,530,728 		95,679 +22.6% 263.71 US$3,530,728
2026-08-06 2026-08-04 PlS Planned sale
3.9
MAETZOLD DEREK J

Pres. & Chief Exec. Officer

Executive Director
1,000 -16.8%
31.34
US$100,000 		1,000 -16.8% 31.34 US$100,000
2026-08-06 2026-08-04 PlS Planned sale
3.9
MAETZOLD DEREK J

Pres. & Chief Exec. Officer

Executive Director
1,000 -16.8%
31.34
US$100,000 		1,000 -16.8% 31.34 US$100,000
2026-08-06 2026-08-04 PlS Planned sale
3.9
MAETZOLD DEREK J

Pres. & Chief Exec. Officer

Executive Director
1,000 -35.7%
31.34
US$100,000 		1,000 -35.7% 31.34 US$100,000
2026-08-06 2026-08-04 PlS Planned sale
3.9
MAETZOLD DEREK J

Pres. & Chief Exec. Officer

Executive Director
1,000 -10.6%
30.79
US$100,000 		1,000 -10.6% 30.79 US$100,000
2026-08-06 2026-08-04 PlS Planned sale
3.9
MAETZOLD DEREK J

Pres. & Chief Exec. Officer

Executive Director
1,000 -10.6%
30.79
US$100,000 		1,000 -10.6% 30.79 US$100,000
2026-08-06 2026-08-04 PlS Planned sale
3.9
MAETZOLD DEREK J

Pres. & Chief Exec. Officer

Executive Director
1,000 -20.1%
30.79
US$100,000 		1,000 -20.1% 30.79 US$100,000
2026-08-05 2026-08-03 PlS Planned sale
1.8
Oelschlager Kristen M

Chief Operating Officer

Officer
1,000 -7.6%
30.62
US$100,000 		1,000 -7.6% 30.62 US$100,000
2026-08-05 2026-08-03 PlS Planned sale
1.8
Oelschlager Kristen M

Chief Operating Officer

Officer
1,000 -23.8%
30.00
US$100,000 		1,000 -23.8% 30.00 US$100,000
2026-08-05 2026-08-03 PlS Planned sale
1.8
Oelschlager Kristen M

Chief Operating Officer

Officer
1,000 -13.7%
29.12
US$100,000 		1,000 -13.7% 29.12 US$100,000
2026-08-04 2026-08-03 PlS Planned sale
2.4
Juvenal Tobin W

Chief Commercial Officer

Officer
1,000 -2.1%
28.25
US$100,000 		1,000 -2.1% 28.25 US$100,000
2026-08-04 2026-08-03 PlS Planned sale
3.9
MAETZOLD DEREK J

Pres. & Chief Exec. Officer

Executive Director
1,000 -11.8%
30.35
US$100,000 		1,000 -11.8% 30.35 US$100,000
2026-08-04 2026-08-03 PlS Planned sale
3.9
MAETZOLD DEREK J

Pres. & Chief Exec. Officer

Executive Director
1,000 -11.8%
30.35
US$100,000 		1,000 -11.8% 30.35 US$100,000
2026-08-04 2026-08-03 PlS Planned sale
3.9
MAETZOLD DEREK J

Pres. & Chief Exec. Officer

Executive Director
1,000 -33.2%
30.35
US$100,000 		1,000 -33.2% 30.35 US$100,000
2026-08-04 2026-07-31 PlS Planned sale
2.4
Juvenal Tobin W

Chief Commercial Officer

Officer
1,000 -2.3%
30.26
US$100,000 		1,000 -2.3% 30.26 US$100,000
2026-08-04 2026-07-31 PlS Planned sale
2.4
Juvenal Tobin W

Chief Commercial Officer

Officer
1,000 -8.1%
29.58
US$100,000 		1,000 -8.1% 29.58 US$100,000
2026-08-04 2026-07-31 PlS Planned sale
2.4
Juvenal Tobin W

Chief Commercial Officer

Officer
1,000 -8.3%
28.84
US$100,000 		1,000 -8.3% 28.84 US$100,000
2026-08-04 2026-07-31 PlS Planned sale
3.9
MAETZOLD DEREK J

Pres. & Chief Exec. Officer

Executive Director
1,000 -5.2%
30.15
US$100,000 		1,000 -5.2% 30.15 US$100,000
2026-08-04 2026-07-31 PlS Planned sale
3.9
MAETZOLD DEREK J

Pres. & Chief Exec. Officer

Executive Director
1,000 -5.2%
30.15
US$100,000 		1,000 -5.2% 30.15 US$100,000
2026-08-04 2026-07-31 PlS Planned sale
3.9
MAETZOLD DEREK J

Pres. & Chief Exec. Officer

Executive Director
1,000 -23.2%
30.15
US$100,000 		1,000 -23.2% 30.15 US$100,000
2026-07-31 2026-07-31 PrS Proposed sale
2.4
Tobin Juvenal

Chief Commercial Officer

Officer
1,000
28.00
US$100,000 		1,000 28.00 US$100,000
2026-07-31 2026-07-31 PrS Proposed sale
3.9
Derek Maetzold

Officer

Officer
1,000
28.00
US$100,000 		1,000 28.00 US$100,000
2026-07-29 2026-07-27 PlS Planned sale
3.9
MAETZOLD DEREK J

Pres. & Chief Exec. Officer

Executive Director
1,000 -0.1%
25.06
US$100,000 		1,000 -0.1% 25.06 US$100,000
2026-07-29 2026-07-27 PlS Planned sale
3.9
MAETZOLD DEREK J

Pres. & Chief Exec. Officer

Executive Director
1,000 -0.1%
25.06
US$100,000 		1,000 -0.1% 25.06 US$100,000
2026-07-29 2026-07-27 PlS Planned sale
3.9
MAETZOLD DEREK J

Pres. & Chief Exec. Officer

Executive Director
1,000 -0.1%
25.06
US$100,000 		1,000 -0.1% 25.06 US$100,000
2026-07-29 2026-07-27 PlS Planned sale
3.9
MAETZOLD DEREK J

Pres. & Chief Exec. Officer

Executive Director
1,000 -0.1%
25.06
US$100,000 		1,000 -0.1% 25.06 US$100,000
2026-07-29 2026-07-27 PlS Planned sale
3.9
MAETZOLD DEREK J

Pres. & Chief Exec. Officer

Executive Director
1,000 -0.1%
25.06
US$100,000 		1,000 -0.1% 25.06 US$100,000
2026-07-29 2026-07-27 PlS Planned sale
3.9
MAETZOLD DEREK J

Pres. & Chief Exec. Officer

Executive Director
1,000 -0.1%
25.06
US$100,000 		1,000 -0.1% 25.06 US$100,000
2026-07-29 2026-07-27 PlS Planned sale
3.9
MAETZOLD DEREK J

Pres. & Chief Exec. Officer

Executive Director
1,000 -1.1%
25.06
US$100,000 		1,000 -1.1% 25.06 US$100,000
2026-07-29 2026-07-27 PlS Planned sale
3.9
MAETZOLD DEREK J

Pres. & Chief Exec. Officer

Executive Director
1,000 -2.2%
24.13
US$100,000 		1,000 -2.2% 24.13 US$100,000
2026-07-29 2026-07-27 PlS Planned sale
3.9
MAETZOLD DEREK J

Pres. & Chief Exec. Officer

Executive Director
1,000 -2.2%
24.13
US$100,000 		1,000 -2.2% 24.13 US$100,000
2026-07-29 2026-07-27 PlS Planned sale
3.9
MAETZOLD DEREK J

Pres. & Chief Exec. Officer

Executive Director
1,000 -2.2%
24.13
US$100,000 		1,000 -2.2% 24.13 US$100,000
2026-07-29 2026-07-27 PlS Planned sale
3.9
MAETZOLD DEREK J

Pres. & Chief Exec. Officer

Executive Director
1,000 -2.2%
24.13
US$100,000 		1,000 -2.2% 24.13 US$100,000
2026-07-29 2026-07-27 PlS Planned sale
3.9
MAETZOLD DEREK J

Pres. & Chief Exec. Officer

Executive Director
1,000 -3.3%
24.13
US$100,000 		1,000 -3.3% 24.13 US$100,000
2026-07-29 2026-07-27 PlS Planned sale
3.9
MAETZOLD DEREK J

Pres. & Chief Exec. Officer

Executive Director
1,000 -3.3%
24.13
US$100,000 		1,000 -3.3% 24.13 US$100,000
2026-07-29 2026-07-27 PlS Planned sale
3.9
MAETZOLD DEREK J

Pres. & Chief Exec. Officer

Executive Director
1,000 -21.6%
24.13
US$100,000 		1,000 -21.6% 24.13 US$100,000
2026-07-16 2026-07-14 PlS Planned sale
3.9
MAETZOLD DEREK J

Pres. & Chief Exec. Officer

Executive Director
278 -2.2%
22.92
US$6,372 		278 -2.2% 22.92 US$6,372
2026-07-16 2026-07-14 PlS Planned sale
3.9
MAETZOLD DEREK J

Pres. & Chief Exec. Officer

Executive Director
278 -2.2%
22.92
US$6,372 		278 -2.2% 22.92 US$6,372
2026-07-16 2026-07-14 PlS Planned sale
3.9
MAETZOLD DEREK J

Pres. & Chief Exec. Officer

Executive Director
278 -2.2%
22.92
US$6,372 		278 -2.2% 22.92 US$6,372
2026-07-16 2026-07-14 PlS Planned sale
3.9
MAETZOLD DEREK J

Pres. & Chief Exec. Officer

Executive Director
278 -2.2%
22.92
US$6,372 		278 -2.2% 22.92 US$6,372
2026-07-16 2026-07-14 PlS Planned sale
3.9
MAETZOLD DEREK J

Pres. & Chief Exec. Officer

Executive Director
1,153 -3.3%
22.92
US$26,427 		1,153 -3.3% 22.92 US$26,427
2026-07-16 2026-07-14 PlS Planned sale
3.9
MAETZOLD DEREK J

Pres. & Chief Exec. Officer

Executive Director
1,357 -3.3%
22.92
US$31,102 		1,357 -3.3% 22.92 US$31,102
2026-07-16 2026-07-14 PlS Planned sale
3.9
MAETZOLD DEREK J

Pres. & Chief Exec. Officer

Executive Director
550 -2.5%
22.92
US$12,606 		550 -2.5% 22.92 US$12,606
2026-07-06 2026-07-01 PlS Planned sale
1.8
Oelschlager Kristen M

Chief Operating Officer

Officer
400 -1.8%
24.78
US$9,912 		400 -1.8% 24.78 US$9,912
2026-07-06 2026-07-01 PlS Planned sale
1.8
Oelschlager Kristen M

Chief Operating Officer

Officer
8,186 -26.9%
24.40
US$199,738 		8,186 -26.9% 24.40 US$199,738
2026-07-06 2026-07-01 PlS Planned sale
3.9
MAETZOLD DEREK J

Pres. & Chief Exec. Officer

Executive Director
278 -2.2%
24.29
US$6,753 		278 -2.2% 24.29 US$6,753
2026-07-06 2026-07-01 PlS Planned sale
3.9
MAETZOLD DEREK J

Pres. & Chief Exec. Officer

Executive Director
278 -2.2%
24.29
US$6,753 		278 -2.2% 24.29 US$6,753
2026-07-06 2026-07-01 PlS Planned sale
3.9
MAETZOLD DEREK J

Pres. & Chief Exec. Officer

Executive Director
278 -2.2%
24.29
US$6,753 		278 -2.2% 24.29 US$6,753
2026-07-06 2026-07-01 PlS Planned sale
3.9
MAETZOLD DEREK J

Pres. & Chief Exec. Officer

Executive Director
278 -2.2%
24.29
US$6,753 		278 -2.2% 24.29 US$6,753
2026-07-06 2026-07-01 PlS Planned sale
3.9
MAETZOLD DEREK J

Pres. & Chief Exec. Officer

Executive Director
1,153 -3.2%
24.29
US$28,006 		1,153 -3.2% 24.29 US$28,006
2026-07-06 2026-07-01 PlS Planned sale
3.9
MAETZOLD DEREK J

Pres. & Chief Exec. Officer

Executive Director
1,357 -3.2%
24.29
US$32,962 		1,357 -3.2% 24.29 US$32,962
2026-07-06 2026-07-01 PlS Planned sale
3.9
MAETZOLD DEREK J

Pres. & Chief Exec. Officer

Executive Director
6,214 -22.4%
24.29
US$150,938 		6,214 -22.4% 24.29 US$150,938
2026-07-01 2026-07-01 PrS Proposed sale
3.9
Derek Maetzold

Officer

Officer
23,844
24.71
US$589,185 		23,844 24.71 US$589,185
2026-06-18 2026-06-16 PlS Planned sale
1.8
Oelschlager Kristen M

Chief Operating Officer

Officer
8,587 -22.0%
20.71
US$177,837 		8,587 -22.0% 20.71 US$177,837
2026-06-16 2026-06-16 PrS Proposed sale
1.8
KRISTEN OELSCHLAGER

Officer

Officer
29,911
20.66
US$617,961 		29,911 20.66 US$617,961
2026-06-17 2026-06-15 PlS Planned sale
3.9
MAETZOLD DEREK J

Pres. & Chief Exec. Officer

Executive Director
278 -2.2%
20.66
US$5,743 		278 -2.2% 20.66 US$5,743
2026-06-17 2026-06-15 PlS Planned sale
3.9
MAETZOLD DEREK J

Pres. & Chief Exec. Officer

Executive Director
278 -2.2%
20.66
US$5,743 		278 -2.2% 20.66 US$5,743
2026-06-17 2026-06-15 PlS Planned sale
3.9
MAETZOLD DEREK J

Pres. & Chief Exec. Officer

Executive Director
278 -2.2%
20.66
US$5,743 		278 -2.2% 20.66 US$5,743
2026-06-17 2026-06-15 PlS Planned sale
3.9
MAETZOLD DEREK J

Pres. & Chief Exec. Officer

Executive Director
278 -2.2%
20.66
US$5,743 		278 -2.2% 20.66 US$5,743
2026-06-17 2026-06-15 PlS Planned sale
3.9
MAETZOLD DEREK J

Pres. & Chief Exec. Officer

Executive Director
1,153 -3.1%
20.66
US$23,821 		1,153 -3.1% 20.66 US$23,821
2026-06-17 2026-06-15 PlS Planned sale
3.9
MAETZOLD DEREK J

Pres. & Chief Exec. Officer

Executive Director
1,357 -3.1%
20.66
US$28,036 		1,357 -3.1% 20.66 US$28,036
2026-06-17 2026-06-15 PlS Planned sale
3.9
MAETZOLD DEREK J

Pres. & Chief Exec. Officer

Executive Director
550 -2.5%
20.66
US$11,363 		550 -2.5% 20.66 US$11,363
2026-06-03 2026-06-01 PlS Planned sale
3.9
MAETZOLD DEREK J

Pres. & Chief Exec. Officer

Executive Director
278 -14.3%
20.86
US$5,798 		278 -14.3% 20.86 US$5,798
2026-06-03 2026-06-01 PlS Planned sale
3.9
MAETZOLD DEREK J

Pres. & Chief Exec. Officer

Executive Director
278 -14.3%
20.86
US$5,798 		278 -14.3% 20.86 US$5,798
2026-06-03 2026-06-01 PlS Planned sale
3.9
MAETZOLD DEREK J

Pres. & Chief Exec. Officer

Executive Director
278 -14.3%
20.86
US$5,798 		278 -14.3% 20.86 US$5,798
2026-06-03 2026-06-01 PlS Planned sale
3.9
MAETZOLD DEREK J

Pres. & Chief Exec. Officer

Executive Director
278 -14.3%
20.86
US$5,798 		278 -14.3% 20.86 US$5,798
2026-06-03 2026-06-01 PlS Planned sale
3.9
MAETZOLD DEREK J

Pres. & Chief Exec. Officer

Executive Director
1,153 -3.0%
20.86
US$24,048 		1,153 -3.0% 20.86 US$24,048
2026-06-03 2026-06-01 PlS Planned sale
3.9
MAETZOLD DEREK J

Pres. & Chief Exec. Officer

Executive Director
1,357 -3.0%
20.86
US$28,303 		1,357 -3.0% 20.86 US$28,303
2026-06-03 2026-06-01 PlS Planned sale
3.9
MAETZOLD DEREK J

Pres. & Chief Exec. Officer

Executive Director
6,214 -22.4%
20.86
US$129,605 		6,214 -22.4% 20.86 US$129,605
2026-06-01 2026-06-01 PrS Proposed sale
3.9
Derek Maetzold

Officer

Officer
14,008
20.97
US$293,748 		14,008 20.97 US$293,748
2026-05-22 2026-05-21 PlS Planned sale
3.9
MAETZOLD DEREK J

Pres. & Chief Exec. Officer

Executive Director
212 -9.8%
20.20
US$4,282 		212 -9.8% 20.20 US$4,282
2026-05-22 2026-05-21 PlS Planned sale
3.9
MAETZOLD DEREK J

Pres. & Chief Exec. Officer

Executive Director
212 -9.8%
20.20
US$4,282 		212 -9.8% 20.20 US$4,282
2026-05-22 2026-05-21 PlS Planned sale
3.9
MAETZOLD DEREK J

Pres. & Chief Exec. Officer

Executive Director
212 -9.8%
20.20
US$4,282 		212 -9.8% 20.20 US$4,282
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