Castle Biosciences

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About CSTL

Castle Biosciences, Inc.is a molecular diagnostics company offering innovative test solutions to aid clinicians in the diagnosis and treatment of dermatologic cancers, barrett’s esophagus, uveal melanoma, and in the treatment of mental health conditions. The firm offers DecisionDx-Melanoma, a proprietary multi-gene expression profile (GEP) test that predicts the risk of metastasis and recurrence for patients diagnosed with invasive cutaneous melanoma.

CEO

Derek J. Maetzold

CEODerek J. Maetzold

Employees

761

Employees761

Headquarters

Friendswood, Texas

HeadquartersFriendswood, Texas

Founded

2007

Founded2007

Employees

761

Employees761

CSTL Key Statistics

Market cap

1.15B

Market cap1.15B

Price-Earnings ratio

-87.40

Price-Earnings ratio-87.40

Dividend yield

—

Dividend yield—

Average volume

326.12K

Average volume326.12K

High today

$40.71

High today$40.71

Low today

$38.68

Low today$38.68

Open price

$39.84

Open price$39.84

Volume

333.92K

Volume333.92K

52 Week high

$42.18

52 Week high$42.18

52 Week low

$14.59

52 Week low$14.59

Stock Snapshot

The current Castle Biosciences(CSTL) stock price is $39.34, with a market capitalization of 1.15B. The stock trades at a price-to-earnings (P/E) ratio of -87.40.

During the trading session on 2026-01-10, Castle Biosciences(CSTL) shares reached a daily high of $40.71 and a low of $38.68. At a current price of $39.34, the stock is +1.7% higher than the low and still -3.4% under the high.

Trading activity shows a volume of 333.92K, compared to an average daily volume of 326.12K.

The stock's 52-week range extends from a low of $14.59 to a high of $42.18.

Analyst ratings

100%

of 8 ratings

Buy

100%

Hold

Sell

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