CSTLCastle Biosciences, Inc. Common Stock

CSNasdaq (XNAS)·USD

Identity

Security key: 13856
Ticker: CSTL
Type: CS — Common Stock
Exchange: Nasdaq(XNAS)
Venue group: NASDAQ
Operating MIC: XNAS
Market: stocks
Locale: us
Currency: USD
Listed: 2019-07-25
Round lot: 100
Active: Yes
Last seen in a load: 2026-08-14 20:49
Vendor updated: 2026-08-13 06:09
Ticker root / suffix: CSTL

Detail

Enriched 2026-08-14 20:47

Market cap: $960,171,005.01
Shares outstanding (class): 30,549,507
Shares outstanding (weighted): 30,549,507
SIC: 8071 SERVICES-MEDICAL LABORATORIES
Employees: 1,002
Location: FRIENDSWOOD, TX
Homepage: https://www.castlebiosciences.com
Description: 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. The company derives revenues through the delivery of test reports for its molecular diagnostic tests.

Market cap and share counts drift.

Funds holding this security

125 funds · 125 positions · $127.63M reported value, as of 2026-03-31

All holders →

Fund	Ticker	Position value	% of fund	Balance	Match
VANGUARD TOTAL STOCK MARKET INDEX FUND VANGUARD INDEX FUNDS	VTI	$20.23M	0.00%	823,964 NS	FIGI
iShares Russell 2000 ETF iShares Trust	IWM	$17.33M	0.02%	705,885 NS	FIGI
Eventide Healthcare & Life Sciences Fund MUTUAL FUND SERIES TRUST	—	$9.49M	0.60%	386,425 NS	FIGI
VANGUARD EXTENDED MARKET INDEX FUND VANGUARD INDEX FUNDS	VXF	$7.99M	0.01%	325,575 NS	FIGI
Wasatch Micro Cap Fund WASATCH FUNDS TRUST	—	$6.79M	1.21%	276,685 NS	FIGI
iShares Russell 2000 Value ETF iShares Trust	IWN	$6.09M	0.05%	248,259 NS	FIGI
Buffalo Small Cap Growth Fund Buffalo Funds	—	$5.88M	1.51%	239,614 NS	FIGI
iShares Biotechnology ETF iShares Trust	IBB	$5.30M	0.07%	215,689 NS	FIGI
Wasatch Ultra Growth Fund WASATCH FUNDS TRUST	—	$4.21M	1.05%	171,643 NS	FIGI
VANGUARD STRATEGIC SMALL-CAP EQUITY FUND VANGUARD HORIZON FUNDS	—	$4.13M	0.17%	168,253 NS	FIGI
Advisors Capital Small/Mid Cap Fund NEIMAN FUNDS	—	$3.31M	2.89%	135,000 NS	FIGI
College Retirement Equities Fund - Total Global… College Retirement Equities Fund	—	$2.67M	0.00%	108,902 NS	FIGI
Nuveen Small Cap Value Opportunities Fund Nuveen Investment Trust	—	$2.64M	0.98%	107,524 NS	FIGI
Omni Small-Cap Value Fund Bridgeway Funds, Inc.	—	$1.94M	0.16%	79,000 NS	FIGI
iShares Micro-Cap ETF iShares Trust	IWC	$1.78M	0.15%	72,440 NS	FIGI

How positions resolve to the securities master. FIGI_COMPOSITE is exact identifier equality — both sides got the FIGI from Bloomberg. TICKER is a narrow fallback used only where the master row carries no FIGI at all (2,389 rows do not, disproportionately Irish-domiciled US listings like LIN and ACN). Roughly 22% of all positions resolve to the master.

Funds holding this security

Identifiers

master.security_identifier

TICKERCSTL
FIGI_COMPOSITEBBG006YWVSR3
FIGI_SHARE_CLASSBBG006YWVSS2
CIK0001447362
ISINUS14843C1053
Resolved through OpenFIGI from a holdings ISIN, not supplied by the securities vendor.

Identifiers

Classification

classification.v_security_classification

Asset class: Equity
Sector: Health Care
Industry: Health Care Providers
Source: LLMunreviewed
Self-reported confidence: 0.8
Model: deepseek
Rationale: Castle Biosciences is a diagnostics company offering molecular tests, classified under healthcare providers.

Classifications are unreviewed model output. All 5,771 assignments carry source = LLM and is_reviewed = false. Confidence is the model’s own estimate and is not calibrated — it clustered at 0.90–0.98 across the whole first pass, including rows that later proved wrong. Use it to order a review queue, not as a probability. Two share classes of one issuer can disagree.

Classification

Fund data

Not linked to a fund series.

Either this is not a fund, or it is one the SEC share-class snapshot cannot reach — commodity trusts and notes have no series ID at all.