Castle Biosciences Inc CSTL
We take great care to ensure that the data presented and summarized in this overview for CASTLE BIOSCIENCES INC is accurate and up-to-date, based on a comprehensive analysis of 13F filing forms for institutional ownership and form 4 filings for insider transactions. Please note that this data may differ from other sources and should not be relied upon as the sole basis for investment decisions.
Top Institutions Holding CSTL
View all-
Black Rock Inc. New York, NY3.04MShares$73.7 Million0.0% of portfolio
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Vanguard Group Inc Valley Forge, PA2.17MShares$52.5 Million0.0% of portfolio
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Principal Financial Group Inc Des Moines, IA1.8MShares$43.6 Million0.02% of portfolio
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Portolan Capital Management, LLC Boston, MA1.49MShares$36.1 Million2.2% of portfolio
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Dimensional Fund Advisors LP Austin, TX1.38MShares$33.4 Million0.01% of portfolio
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Nuveen, LLC Charlotte, NC1.07MShares$26 Million0.01% of portfolio
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Wasatch Advisors Inc Salt Lake City, UT1.05MShares$25.4 Million0.12% of portfolio
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Ken Griffin Citadel Advisors LLC | Chicago, Il889KShares$21.5 Million0.0% of portfolio
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Braidwell LP Stamford, CT823KShares$19.9 Million1.03% of portfolio
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Allianz Asset Management Gmb H Munich, 2M714KShares$17.3 Million0.02% of portfolio
Latest Institutional Activity in CSTL
Top Purchases
Top Sells
About CSTL
Castle Biosciences, Inc., a commercial-stage diagnostics company, focuses to provide diagnostic and prognostic testing services for dermatological cancers. Its lead product is DecisionDx-Melanoma, a multi-gene expression profile (GEP) test to identify the risk of metastasis for patients diagnosed with invasive cutaneous melanoma. The company also offers DecisionDx-UM test, a proprietary GEP test that predicts the risk of metastasis for patients with uveal melanoma, a rare eye cancer; DecisionDx-SCC, a proprietary 40-gene expression profile test that uses an individual patient's tumor biology to predict individual risk of squamous cell carcinoma metastasis for patients with one or more risk factors; and DecisionDx DiffDx-Melanoma and myPath Melanoma, a proprietary GEP test to diagnose suspicious pigmented lesions. It offers test services through physicians and their patients. The company was founded in 2007 and is headquartered in Friendswood, Texas.
Insider Transactions at CSTL
Insider Transaction List
View all| Date | Insider | Transaction | Ownership Type | Shares Traded | Value / Price |
|---|---|---|---|---|---|
|
Oct 20
2025
|
Derek J Maetzold Pres. & Chief Exec. Officer |
SELL
Open market or private sale
|
Direct |
1,339
-2.08%
|
$29,458
$22.44 P/Share
|
|
Oct 02
2025
|
Derek J Maetzold Pres. & Chief Exec. Officer |
SELL
Open market or private sale
|
Direct |
1,339
-2.04%
|
$29,458
$22.58 P/Share
|
|
Sep 17
2025
|
Derek J Maetzold Pres. & Chief Exec. Officer |
SELL
Open market or private sale
|
Direct |
1,339
-2.0%
|
$28,119
$21.97 P/Share
|
|
Sep 02
2025
|
Derek J Maetzold Pres. & Chief Exec. Officer |
SELL
Open market or private sale
|
Direct |
1,339
-1.96%
|
$30,797
$23.93 P/Share
|
|
Aug 27
2025
|
Kristen M Oelschlager Chief Operating Officer |
SELL
Open market or private sale
|
Direct |
30,684
-9.36%
|
$644,364
$21.86 P/Share
|
|
Aug 15
2025
|
Derek J Maetzold Pres. & Chief Exec. Officer |
SELL
Open market or private sale
|
Direct |
1,339
-1.92%
|
$26,780
$20.04 P/Share
|
|
Aug 13
2025
|
Derek J Maetzold Pres. & Chief Exec. Officer |
SELL
Open market or private sale
|
Direct |
43,019
-38.17%
|
$817,361
$19.5 P/Share
|
|
Aug 08
2025
|
Tobin W Juvenal Chief Commercial Officer |
SELL
Payment of exercise price or tax liability
|
Direct |
4,294
-4.83%
|
$81,586
$19.36 P/Share
|
|
Aug 08
2025
|
Tobin W Juvenal Chief Commercial Officer |
BUY
Exercise of conversion of derivative security
|
Direct |
10,640
+10.7%
|
-
|
|
Aug 08
2025
|
Kristen M Oelschlager Chief Operating Officer |
SELL
Payment of exercise price or tax liability
|
Direct |
2,804
-1.61%
|
$53,276
$19.36 P/Share
|
|
Aug 08
2025
|
Kristen M Oelschlager Chief Operating Officer |
BUY
Exercise of conversion of derivative security
|
Direct |
10,640
+5.74%
|
-
|
|
Aug 08
2025
|
Frank Stokes Chief Financial Officer |
SELL
Payment of exercise price or tax liability
|
Direct |
4,356
-8.21%
|
$82,764
$19.36 P/Share
|
|
Aug 08
2025
|
Frank Stokes Chief Financial Officer |
BUY
Exercise of conversion of derivative security
|
Direct |
9,744
+15.51%
|
-
|
|
Aug 08
2025
|
Derek J Maetzold Pres. & Chief Exec. Officer |
SELL
Payment of exercise price or tax liability
|
Direct |
23,972
-17.54%
|
$455,468
$19.36 P/Share
|
|
Aug 08
2025
|
Derek J Maetzold Pres. & Chief Exec. Officer |
BUY
Exercise of conversion of derivative security
|
Direct |
66,991
+32.89%
|
-
|
|
Jun 27
2025
|
Derek J Maetzold Pres. & Chief Exec. Officer |
SELL
Open market or private sale
|
Indirect |
17,632
-14.72%
|
$352,640
$20.3 P/Share
|
|
Jun 27
2025
|
Derek J Maetzold Pres. & Chief Exec. Officer |
SELL
Open market or private sale
|
Direct |
4,944
-6.62%
|
$98,880
$20.3 P/Share
|
|
May 21
2025
|
G Bradley Cole Director |
BUY
Exercise of conversion of derivative security
|
Direct |
8,673
+28.31%
|
-
|
|
May 21
2025
|
Kim Caple Director |
BUY
Exercise of conversion of derivative security
|
Direct |
8,673
+27.86%
|
-
|
|
May 21
2025
|
Rodney Cotton Director |
BUY
Exercise of conversion of derivative security
|
Direct |
8,673
+38.25%
|
-
|
Last 12 Months Summary
| Exercise of conversion of derivative security | 364K shares |
|---|
| Open market or private sale | 271K shares |
|---|---|
| Payment of exercise price or tax liability | 102K shares |