Institutional shares held 25.9 Million
128K calls
35.4K puts
Total value of holdings $517M
$2.55M calls
$705K puts
Market Cap $524M
26,297,000 Shares Out.
Institutional ownership 98.59%
# of Institutions 209


Latest Institutional Activity in CSTL

Top Purchases

Q1 2025
Gamma Investing LLC Shares Held: 4.36K ($87K)
Q1 2025
Summit Global Investments Shares Held: 30.6K ($611K)
Q4 2024
Principal Financial Group Inc Shares Held: 1.44M ($28.6M)
Q4 2024
Ubs Group Ag Shares Held: 813K ($16.2M)
Q4 2024
Wellington Management Group LLP Shares Held: 722K ($14.4M)

Top Sells

Q1 2025
Rhumbline Advisers Shares Held: 39.2K ($781K)
Q1 2025
Parallel Advisors, LLC Shares Held: 27.6K ($550K)
Q1 2025
Massmutual Trust CO Fsb Shares Held: 51 ($1.02K)
Q1 2025
Rothschild Investment LLC Shares Held: 20 ($399)
Q4 2024
Bellevue Group Ag Shares Held: 746K ($14.9M)

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

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Date Insider Transaction Ownership Type Shares Traded Value / Price
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Last 12 Months Summary

Buy / Acquisition
366K Shares
From 16 Insiders
Exercise of conversion of derivative security 268K shares
Grant, award, or other acquisition 98K shares
Sell / Disposition
390K Shares
From 9 Insiders
Open market or private sale 294K shares
Payment of exercise price or tax liability 96.1K shares

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