CSTL

CASTLE BIOSCIENCES INC

Services-Medical LaboratoriesNasdaqAccelerated filer

Total Trades

125

Buys

3

Sells

118

Largest Trade

$1M+

Insiders

7

Institutional Funds

149

Inst. Value

$1M+

Activist Filings

17

Insider Trades

InsiderTitleTypeValueSharesPriceDate
Stokes FrankCFOSELL$100K–$500K7K$27.44Mar 5, 2026
Stokes FrankCFOEXERCISE$1K–$15K28K$0.46Mar 5, 2026
MAETZOLD DEREK JPres. & Chief Exec…SELL$100K–$500K4K$39.52Feb 5, 2026
MAETZOLD DEREK JPres. & Chief Exec…SELL$100K–$500K4K$40.01Jan 22, 2026
MAETZOLD DEREK JPres. & Chief Exec…SELL$100K–$500K4K$38.76Jan 7, 2026
MAETZOLD DEREK JPres. & Chief Exec…SELL$15K–$50K830$40.35Dec 29, 2025
MAETZOLD DEREK JPres. & Chief Exec…SELL$15K–$50K509$40.04Dec 19, 2025
Oelschlager Kristen MCOOSELL$500K+15K$39.31Dec 19, 2025
MAETZOLD DEREK JPres. & Chief Exec…SELL$1M+32K$38.69Dec 17, 2025
Juvenal Tobin WChief Commercial O…SELL$100K–$500K13K$37.48Dec 15, 2025
Stokes FrankCFOSELL$100K–$500K4K$37.45Dec 15, 2025
MAETZOLD DEREK JPres. & Chief Exec…SELL$50K–$100K1K$40.03Dec 8, 2025
MAETZOLD DEREK JPres. & Chief Exec…SELL$100K–$500K3K$39.23Dec 4, 2025
MAETZOLD DEREK JPres. & Chief Exec…SELL$100K–$500K4K$40.09Dec 1, 2025
MAETZOLD DEREK JPres. & Chief Exec…SELL$100K–$500K5K$40.05Nov 26, 2025
Juvenal Tobin WChief Commercial O…SELL$100K–$500K5K$35.58Nov 24, 2025
Juvenal Tobin WChief Commercial O…EXERCISE$15K–$50K5K$3.38Nov 24, 2025
MAETZOLD DEREK JPres. & Chief Exec…SELL$50K–$100K3K$34.02Nov 20, 2025
Stokes FrankCFOSELL$100K–$500K5K$35.08Nov 13, 2025
Juvenal Tobin WChief Commercial O…SELL$15K–$50K700$35.39Nov 13, 2025
Oelschlager Kristen MCOOSELL$500K+19K$35.10Nov 13, 2025
MAETZOLD DEREK JPres. & Chief Exec…SELL$100K–$500K9K$30.84Nov 6, 2025
Oelschlager Kristen MCOOSELL$100K–$500K13K$25.04Nov 5, 2025
MAETZOLD DEREK JPres. & Chief Exec…SELL$15K–$50K1K$22.44Oct 23, 2025
MAETZOLD DEREK JPres. & Chief Exec…SELL$15K–$50K1K$21.97Sep 19, 2025
MAETZOLD DEREK JPres. & Chief Exec…SELL$15K–$50K1K$23.93Sep 4, 2025
Oelschlager Kristen MCOOSELL$100K–$500K13K$22.02Aug 29, 2025
Oelschlager Kristen MCOOSELL$100K–$500K18K$21.69Aug 29, 2025
MAETZOLD DEREK JPres. & Chief Exec…SELL$100K–$500K23K$20.30Jul 1, 2025
MAETZOLD DEREK JPres. & Chief Exec…SELL$100K–$500K6K$21.52Apr 23, 2025
MAETZOLD DEREK JPres. & Chief Exec…SELL$100K–$500K6K$20.19Apr 10, 2025
MAETZOLD DEREK JPres. & Chief Exec…SELL$100K–$500K6K$20.30Mar 28, 2025
Stokes FrankCFOSELL$100K–$500K8K$26.70Feb 24, 2025
MAETZOLD DEREK JPres. & Chief Exec…SELL$50K–$100K3K$28.03Jan 15, 2025
BRADBURY DANIELDirectorSELL$100K–$500K8K$29.14Jan 8, 2025
MAETZOLD DEREK JPres. & Chief Exec…SELL$100K–$500K8K$29.66Jan 8, 2025
Juvenal Tobin WChief Commercial O…SELL$50K–$100K2K$30.00Jan 8, 2025
Stokes FrankCFOSELL$100K–$500K7K$29.93Nov 19, 2024
MAETZOLD DEREK JPres. & Chief Exec…SELL$100K–$500K5K$34.15Nov 14, 2024
Juvenal Tobin WChief Commercial O…SELL$100K–$500K4K$35.56Nov 7, 2024
Juvenal Tobin WChief Commercial O…EXERCISE$1K–$15K4K$3.38Nov 7, 2024
MAETZOLD DEREK JPres. & Chief Exec…SELL$100K–$500K5K$32.54Nov 6, 2024
Juvenal Tobin WChief Commercial O…EXERCISE$1K–$15K1K$3.38Nov 5, 2024
Juvenal Tobin WChief Commercial O…SELL$100K–$500K3K$35.39Nov 5, 2024
BRADBURY DANIELDirectorSELL$100K–$500K8K$34.73Nov 5, 2024
MAETZOLD DEREK JPres. & Chief Exec…SELL$100K–$500K5K$32.27Oct 16, 2024
MAETZOLD DEREK JPres. & Chief Exec…SELL$50K–$100K3K$30.27Oct 10, 2024
BRADBURY DANIELDirectorSELL$100K–$500K8K$29.44Oct 9, 2024
MAETZOLD DEREK JPres. & Chief Exec…SELL$50K–$100K3K$28.73Oct 8, 2024
MAETZOLD DEREK JPres. & Chief Exec…SELL$100K–$500K4K$30.08Sep 3, 2024
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Activist & 5%+ Owners

SC 13D/13G filings — investors holding 5%+ of outstanding shares

Dimensional Fund Advisors LP

SC 13G/A · Jan 21, 2026

3.9%

1.1M shares

Dimensional Fund Advisors LP

SC 13G · Oct 9, 2025

5.1%

1.5M shares

WASATCH ADVISORS LP

SC 13G/A · May 12, 2025

3.5%

998K shares

BlackRock, Inc.

SC 13G/A · Apr 24, 2025

8.2%

2.3M shares

Portolan Capital Management, LLC

SC 13G · Apr 14, 2025

5.7%

1.6M shares

The Vanguard Group

SC 13G/A · Jan 31, 2025

6.5%

1.8M shares

Granahan Investment Management LLC

SC 13G/A · Nov 14, 2024

1.5%

425K shares

Wasatch Advisors LP 87-0319391

SC 13G/A · Nov 13, 2024

6.6%

1.8M shares

BlackRock, Inc.

SC 13G/A · Jul 8, 2024

11.0%

3.0M shares

8.1%

2.2M shares

The Vanguard Group - 23-1945930

SC 13G/A · Feb 13, 2024

5.4%

1.5M shares

Principal Global Investors, LLC

SC 13G · Feb 13, 2024

5.9%

1.6M shares

BlackRock, Inc.

SC 13G/A · Jan 25, 2024

8.5%

2.3M shares

Wasatch Advisors LP 87-0319391

SC 13G/A · Feb 9, 2023

12.2%

3.2M shares

BlackRock, Inc.

SC 13G/A · Feb 3, 2023

8.1%

2.1M shares

Derek J. Maetzold

SC 13G/A · Feb 11, 2022

4.0%

1.0M shares

Wasatch Advisors, Inc. 87-0319391

SC 13G/A · Feb 10, 2022

12.3%

3.1M shares

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