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NASDAQ · CSTL

Castle Biosciences, Inc.

Healthcare · Medical - Diagnostics & Research

$34.20

Up+$1.27 (+3.86%)

Updated Aug 22, 2026, 4:44 PM

SID Score

5.5/10

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 – $34.70
Volume
573.47K
Avg. volume
400.7K

Price performance

CSTL price history

1M range · 21 trading sessions · Daily adjusted prices

CSTL closed at $34.20 after 21 trading sessions, up 38.55% for the selected period.

Last close
$34.20
Period change
+38.55%
Period low
$23.89
Period high
$34.20
Daily close
View OHLC price history
CSTL OHLC price history, latest 40 sessions
DateOpenHighLowCloseVolume
Aug 21, 2026$32.85$34.70$32.14$34.20573.47K
Aug 20, 2026$32.41$34.01$32.41$32.93322.94K
Aug 19, 2026$29.03$32.39$29.03$32.32451.92K
Aug 18, 2026$29.89$30.125$28.72$29.03596.61K
Aug 17, 2026$29.50$30.50$29.21$29.95225.81K
Aug 14, 2026$30.93$31.115$29.58$29.62264.21K
Aug 13, 2026$31.62$31.97$30.51$30.55362.23K
Aug 12, 2026$32.43$33.00$31.25$31.43436K
Aug 11, 2026$32.34$32.99$31.4642$32.24313.47K
Aug 10, 2026$31.86$33.06$31.24$32.35400.77K
Aug 7, 2026$30.88$32.365$30.6501$32.03241.82K
Aug 6, 2026$30.20$30.75$29.50$30.47833.43K
Aug 5, 2026$31.18$31.42$30.10$30.40520.2K
Aug 4, 2026$30.18$31.73$29.99$31.18675.3K
Aug 3, 2026$27.83$30.725$27.83$30.39777.61K
Jul 31, 2026$28.75$30.81$27.50$28.001.76M
Jul 30, 2026$24.50$27.13$24.50$26.79716.33K
Jul 29, 2026$23.93$25.30$23.73$24.46340.08K
Jul 28, 2026$24.63$24.77$23.76$23.89366.21K
Jul 27, 2026$25.10$25.115$23.85$24.44291.64K
Jul 24, 2026$25.56$25.625$24.35$24.685408.99K

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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News briefing

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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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