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Castle Biosciences, Inc. (CSTL) Stock Analysis

Healthcare

Castle Biosciences, Inc.

$19.69

$-0.46 (-2.28%)

Last Updated: May 26, 2026

Price History

Analysis

Company Overview

Castle Biosciences, Inc. operates as a molecular diagnostics company that provides specialized test solutions designed for the diagnosis and treatment of specific medical conditions, including dermatologic cancers, Barrett's esophagus, atopic dermatitis, and uveal melanoma. The firm functions within the healthcare sector, specifically targeting the diagnostics and research industry, which focuses on developing laboratory tools and methodologies to support clinical decision-making and patient care. This entity maintains a significant operational footprint with a workforce of 883 employees, reflecting its substantial scale within the specialized biotechnology landscape. The company's current market capitalization stands at $753.69M, while its trailing twelve-month revenue totals $344.23M; these figures indicate that Castle Biosciences is an established player with a substantial asset base and a diversified product portfolio capable of generating significant top-line activity.

Financial Health

The company reported a trailing twelve-month revenue of $344.23M, yet this generated a net income of $-24,158,000, revealing a cost structure where expenses significantly outpace gross profits before the bottom line is reached. While the net income reflects a substantial loss, the EBITDA stands at $-2,039,000, suggesting that cash operating expenses are lower than the net loss due to non-cash charges such as depreciation and amortization, though the business remains unprofitable on an earnings basis. Despite the negative earnings, the company boasts a free cash flow of $41.21M, which provides critical financial flexibility to fund research and development initiatives without relying on external capital markets. The gross margin is robust at 79.4%, indicating high pricing power or efficient manufacturing relative to cost of goods sold, whereas the operating margin of -4.4% and profit margin of -7.0% highlight the significant overhead burdens typical of early-stage diagnostic ventures. On the balance sheet, total cash reserves of $299.50M far exceed total debt of $37.02M, creating a highly conservative financial position that mitigates liquidity risk. This strength is further underscored by a debt-to-equity ratio of 7.86 and a current ratio of 5.26, both of which demonstrate that the company possesses ample liquidity to cover short-term obligations and withstand market downturns. Finally, the return on equity is -5.2% and the return on assets is -2.6%, metrics that reveal that management has yet to generate positive returns on the capital deployed, a common characteristic for companies reinvesting heavily in growth before achieving profitability.

Valuation Assessment

The trailing P/E ratio is listed as N/A due to the absence of positive net income, while the forward P/E is -46.62, implying that the market is pricing in a future earnings trajectory that is currently not realized in historical data. The price-to-book ratio is 1.60, which indicates that the market values the company at a 60% premium over its book value, suggesting that investors are willing to pay extra for the company's intangible assets and intellectual property. Alternative valuation metrics such as the price-to-sales ratio of 2.19 and an EV/EBITDA of -240.90 provide context, showing that the company is valued based on revenue generation rather than current profitability, a standard approach for capital-intensive diagnostics firms. The stock's trading range is defined by a 52-week high of $44.28 and a 52-week low of $14.59, placing the current price contextually within a wide band of volatility that reflects market sentiment toward the company's clinical pipeline progress. With a beta of 1.13, the stock exhibits price volatility that is slightly higher than the broader market, indicating that the equity price is expected to swing more aggressively than the general market index in response to sector-specific news or macroeconomic shifts.

Growth & Income

The revenue growth year-over-year is 0.8%, while earnings growth is N/A, indicating that the company is currently unable to grow its earnings alongside its revenue due to the prevailing losses in the bottom line. Because the company does not pay dividends, evidenced by a dividend yield of N/A and a payout ratio of 0.0%, it retains all earnings to reinvest into growth initiatives rather than distributing cash to shareholders. The absence of a dividend yield confirms that the company's capital allocation strategy prioritizes funding its molecular diagnostic platforms and expanding its market presence over returning capital to investors. Overall, the growth and income profile is characterized by moderate revenue expansion paired with a total reinvestment of earnings, as the firm focuses on achieving the profitability necessary to eventually support shareholder returns.

Peer Comparison

Castle Biosciences, Inc. (CSTL) operates in the Diagnostics & Research industry. Here is how it compares to its closest peers by market capitalization:

Company Ticker Market Cap P/E Ratio
Castle Biosciences, Inc. CSTL $597.20M N/A
Thermo Fisher Scientific Inc. TMO $166.55B 24.6
Danaher Corporation DHR $122.31B 33.4
IDEXX Laboratories, Inc. IDXX $43.95B 41.0

The Diagnostics & Research industry average P/E ratio is 32.5x. Castle Biosciences, Inc. trades at a P/E of N/A.

This analysis is AI-generated for informational purposes only and should not be considered financial advice. Data may be delayed or inaccurate. Always do your own research and consult a qualified financial advisor before making investment decisions.

About Castle Biosciences, Inc.

Castle Biosciences, Inc., a molecular diagnostics company, provides test solutions for the diagnosis and treatment of dermatologic cancers, Barrett's esophagus (BE), atopic dermatitis (AD), and uveal melanoma. The company offers DecisionDx-Melanoma, a risk stratification gene expression profile (GEP) test that predicts the likelihood of a positive sentinel lymph node and the risk of metastasis for patients with invasive cutaneous melanoma; TissueCypher, a risk stratification spatialomics test to predict future development of high-grade dysplasia and/or esophageal cancer in patients with non-dysplastic, indefinite dysplasia, and low-grade dysplasia BE; AdvanceAD-Tx, a non-invasive GEP test which is designed to guide systemic treatment selection for patients aged 12 years and older with moderateto-severe AD; DecisionDx-SCC, a GEP test for cutaneous squamous cell carcinoma; and MyPath Melanoma, a diagnostic GEP test for use in patients with difficult-to-diagnose melanocytic lesions. It also provides DecisionDx-UM, a risk stratification GEP test that predicts the risk of metastasis for patients with uveal melanoma. The company offers its products to dermatology and gastroenterology markets. The company was incorporated in 2007 and is headquartered in Friendswood, Texas.

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Key Statistics

Market Cap
$597.20M
P/E Ratio
N/A
52-Week High
$44.28
52-Week Low
$14.59
Avg Volume
391.04K
Beta
1.11

Data provided by Yahoo Finance via yfinance. Updated daily.

Company Info

Exchange
NASDAQ
Country
United States
Employees
942