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NASDAQ · CSTL

Castle Biosciences, Inc.

Healthcare · Medical - Diagnostics & Research

$33.36

Down-$0.36 (-1.08%)

Updated Oct 8, 2026, 12:31 AM

SID Score

5.7/10

Composite research score

Smart Money

—

Institutional and insider signal

Market cap
1.11B
P/E ratio
-115.98
Dividend yield
0.00%
52-week range
$17.72 – $37.99
Volume
609.15K
Avg. volume
400.7K

Price performance · CSTL

CSTL price history

1M range · 20 trading sessions · Daily adjusted prices

Prices through Oct 6, 2026

CSTL closed at $33.36 after 20 trading sessions, up 3.25% for the selected period.

Last close
$33.36
Period change
+3.25%
Period low
$32.31
Period high
$36.78
Daily close
View OHLC price history
CSTL OHLC price history, latest 40 sessions
DateOpenHighLowCloseVolume
Oct 6, 2026$36.65$37.99$33.10$33.36609.15K
Oct 5, 2026$35.45$36.76$35.10$36.65377.26K
Oct 2, 2026$35.56$35.92$34.75$35.56167.72K
Oct 1, 2026$36.10$36.99$35.17$35.255522.29K
Sep 30, 2026$34.90$36.03$34.1375$35.53639.61K
Sep 29, 2026$35.72$36.24$34.24$34.88318.62K
Sep 28, 2026$35.81$36.265$35.085$35.93228.43K
Sep 25, 2026$35.19$36.12$34.44$35.81437.68K
Sep 24, 2026$34.88$35.84$33.90$35.19439.15K
Sep 23, 2026$34.74$34.965$33.9938$34.88348.28K
Sep 22, 2026$35.53$35.53$34.57$34.85430.98K
Sep 21, 2026$35.68$35.68$34.48$34.99391.68K
Sep 18, 2026$36.54$36.54$35.29$35.34530.24K
Sep 17, 2026$35.98$36.85$34.94$36.78364.65K
Sep 16, 2026$35.50$36.82$35.255$35.48559.27K
Sep 15, 2026$33.64$35.685$33.64$35.50519.95K
Sep 14, 2026$32.30$33.53$32.16$33.44165.4K
Sep 11, 2026$32.77$32.94$31.71$32.33224.2K
Sep 10, 2026$31.97$32.70$31.44$32.32237.83K
Sep 9, 2026$32.43$33.03$32.00$32.31194.56K

Latest CSTL news

The latest Smart Investors Daily articles mentioning CSTL.

Stock researchCompany · Overview

CSTL research

Overview

Company profile and research snapshot.

Company profile

Castle Biosciences Inc is a molecular diagnostics company. The group provides test solutions for the diagnosis and treatment of dermatologic cancers, Barrett's esophagus (BE), and uveal melanoma. The product portfolio of the company includes DecisionDx-Melanoma, a risk stratification gene expression profile (GEP) test; DecisionDx-SCC, a risk stratification test for cutaneous squamous cell carcinoma; MyPath Melanoma, a diagnostic GEP test for use in patients with difficult-to-diagnose melanocytic lesions; and TissueCypher, a test to predict future development of progression of high-grade dysplasia and/or esophageal cancer. It also provides DecisionDx-UM, a risk stratification GEP test. The company also offers its products to the skin cancer and gastroenterology markets.

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Analyst outlook

Consensus and target data currently published for this company.

Consensus
—
Average target
$38.00
Implied upside
—
Analysts
—
CSTL recent ratings
DateFirmRatingTarget
Aug 3, 2026BTIGBuy—
Jun 25, 2026Roth CapitalBuy—
May 13, 2026BTIGBuy—
May 7, 2026BairdOutperform—
Apr 20, 2026Canaccord GenuityBuy—
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Benzinga · Feb 19, 2026

Castle Biosciences Publishes A Prospective, Multicenter Clinical Validation Study In The Journal Of The American Academy Of Dermatology Demonstrating That Its AdvanceAD-Tx Test Can Identify Patients With Moderate-To-Severe Atopic Dermatitis Who Are More Likely To Achieve Greater And Faster Clinical Responses When Treated With A Janus Kinase Inhibitor Compared To T Helper Type 2 Targeted Therapies

Castle Biosciences, Inc. (NASDAQ:CSTL), a company improving health through innovative tests that guide patient care, today announced the publication of a prospective, multicenter clinical validation study in

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